APCO ARGENTINA INC/NEW
10-K405, 2000-03-20
CRUDE PETROLEUM & NATURAL GAS
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                             AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-K

(Mark One)
[X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT
    OF 1934 (FEE REQUIRED)

                   For the fiscal year ended December 31, 1999

                                       OR

[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
    ACT OF 1934

                                (NO FEE REQUIRED)

      For the transition period from                to
                                     --------------    ---------------

                        Commission file number 0-8933


                               APCO ARGENTINA INC.
             (Exact name of registrant as specified in its charter)

          Cayman Islands
(State or other jurisdiction of                                   EIN 98-0199453
incorporation or organization)

          P. O. Box 2400
          Tulsa, Oklahoma                                                  74102
(Address of principal executive offices)                              (Zip Code)

       Registrant's telephone number, including area code: (918) 573-2164


           Securities registered pursuant to Section 12(b) of the Act:

Title of each class                    Name of each exchange on which registered
        None                                             None

           Securities registered pursuant to Section 12(g) of the Act:
                 Ordinary Shares $.01 Par Value (Title of Class)


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

The aggregate market value of the voting stock of the registrant held by
non-affiliates of the registrant on March 15, 2000, was $73,688,444. This value
was calculated based upon the average bid and asked prices of the registrant's
stock of $32 1/4 on March 15, 2000, as reported to the Company by the National
Association of Securities Dealers. Since the shares of the registrant's stock
trade sporadically in the over-the-counter market, the bid and asked prices and
the aggregate market value of stock held by non-affiliates based thereon may not
necessarily be representative of the actual market value. See Item 5.

At March 15, 2000 there were outstanding 7,360,311 shares, $.01 par value, of
the registrant.

                       Documents Incorporated By Reference

List hereunder the following documents if incorporated by reference and the part
of the Form 10-K (e.g., Part I, Part II, etc.) into which the document is
incorporated:


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                                    P A R T I

ITEM I.        BUSINESS

(a)            GENERAL DEVELOPMENT OF BUSINESS

Apco Argentina Inc. ("the Company") is a Cayman Islands corporation which was
organized April 6, 1979 as a successor to Apco Argentina Inc., a Delaware
corporation organized July 1, 1970. The principal business of the Company is its
47.6 percent participation in a joint venture engaged in the exploration,
production, and development of oil and gas in the Entre Lomas concession located
in the provinces of Rio Negro and Neuquen in southwest Argentina. The Company
also owns a 1.5 percent participation in a joint venture engaged in oil and gas
exploration and development in the Acambuco concession located in the province
of Salta in northwest Argentina, and a 45 percent participation in a third joint
venture engaged in oil exploration and development in the Canadon Ramirez
concession located in the province of Chubut in southern Argentina.

Over the last three years the price of crude oil has fluctuated dramatically.
The Company's per barrel oil sales price during this period averaged $17.75 in
1999, $12.71 in 1998, and $19.52 in 1997. This volatility manifested itself in
particular during 1998 and 1999 during which the price of West Texas
Intermediate, the reference crude price for sales of oil produced in Argentina,
declined to approximately $10, a level not experienced since 1986, and then
commencing March 1999 recovered dramatically to just over $30 by March 2000.
During the year, the Company generated net income of $9.5 million, compared with
$3.4 million and $13 million for 1998 and 1997, respectively.

(b)            FINANCIAL INFORMATION ABOUT INDUSTRY SEGMENTS

None.

(c)            NARRATIVE DESCRIPTION OF BUSINESS

ENTRE LOMAS

The Company participates in a joint venture with Petrolera Perez Companc S.A.
("Petrolera") and Perez Companc S.A. ("Perez Companc"). Both partners are
Argentine companies. The purpose of the joint venture is the exploration and
development of the Entre Lomas oil and gas concession in the provinces of Rio
Negro and Neuquen in southwest Argentina. The Company's interest in the joint
venture totals 47.6 percent of which 23 percent is a direct participation and
24.6 percent is owned indirectly by virtue of the Company's 33.6 percent stock
ownership in Petrolera, the operator of the joint venture. Petrolera owns a
73.15 percent direct interest in the joint venture.

YPF CONTRACTS

In 1967, Yacimientos Petroliferos Fiscales ("YPF"), then the national oil
company of Argentina, sought bids for the development of the Entre Lomas area.
Perez Companc won the bid and entered into contract 12,507, dated March 13,
1968, which contract permitted the Entre Lomas joint venture to explore for,
develop, and produce oil in the area. Similar contracts with YPF with respect to
natural gas produced and liquids extracted from natural gas were entered into on
November 18, 1970, and February 10, 1977, respectively. Originally, the joint
venture's interests in the Entre Lomas area were derived from such contracts and
not from direct ownership of the mineral


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resources involved. Under Argentine hydrocarbon laws, the Argentine government
retains ownership of the minerals in place.

JOINT VENTURE AGREEMENTS

On April 1, 1968, Perez Companc and Petrolera entered into a joint venture
agreement with Apco Oil Corporation pursuant to which Petrolera became operator
of the Entre Lomas area. On July 1, 1970, Apco Oil Corporation transferred its
interest in the Entre Lomas area to the Company. Similar joint venture
agreements among the Company, Perez Companc and Petrolera for the development of
natural gas and extraction of propane and butane were entered into February 29,
1972, and March 23, 1977, respectively.

DEREGULATION

On November 8, 1989, the Argentine government issued decree 1212/89 describing
steps necessary to deregulate hydrocarbon production from existing production
and development contracts, including Entre Lomas. The decree directed YPF to
negotiate with producers the conversion of contracts to the concession or
association system described in the 1967 Hydrocarbon Law 17,319, and gave owners
of the converted contracts the right to freely dispose of hydrocarbons produced
at world prices.

Complete deregulation of the Entre Lomas area was implemented by an agreement
that went into effect January 22, 1991, amended in February 1994. Pursuant to
the agreement, Entre Lomas was converted to a concession giving the joint
venture partners ownership of produced hydrocarbons at the wellhead. Under this
agreement, the concession holders, or joint venture partners, have the right to
freely sell produced hydrocarbons in internal or external markets, and have
complete authority over operation of the concession including future exploration
and development plans. The partners, throughout the term of the concession, are
subject to provincial royalties, production taxes, and federal income taxes,
which rates of tax are currently twelve percent (12%), two percent (2%), and
thirty five percent (35%), respectively. The Entre Lomas concession term
currently runs through the year 2016, with an option granted the joint venture
partners to extend the concession for an additional ten years, or 2026.

SALE OF OIL

The Entre Lomas concession participates in several contracts negotiated by the
Perez Companc group. This arrangement allows the joint venturers to pool Entre
Lomas oil with other concessions in the Medanito area providing greater
negotiation strength with Argentine refiners and export customers.

During 1999, 30 percent of Entre Lomas oil sold was exported to Petrobras, the
Brazilian national oil company. The remainder was sold domestically to Refineria
San Lorenzo S.A. and Shell C.A.P.S.A under various short-term contracts.
Excellent demand exists for Medanito area crude oil because of its relative
quality and favored geographical location. While there is no guarantee,
management is confident that upon expiration, these contracts can be extended or
replaced.

The per barrel price for Argentine crude oil continues to be based on the spot
market price of West Texas Intermediate less a discount to provide for
differences in gravity and quality. The average weighted price discount for
contracts in effect during 1999 was $1.37, as compared with $1.58 for


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contracts in effect in 1998, and $1.26 for contracts in effect during 1997.
Since deregulation of Argentina's energy industry in 1991, domestic market
conditions have evolved to the point that the discount for oil sold in country
appears to have stabilized in the $1.00 to $1.50 range depending on market
conditions. Discounts for oil exported to Brazil are approximately fifty percent
higher. Export oil is not subject to domestic production tax.

SALE OF GAS

Since 1994, the Entre Lomas joint venture partners have sold gas to Litoral Gas
S.A. pursuant to a five-year primary contract. This contract expired in March
1999 and was replaced by a new primary gas sales contract with Camuzzi Gas
Pampeana S.A. ("Camuzzi") that expires on April 30, 2002. Under the contract,
the daily gas volume commitment is 28 million cubic feet ("mmcf") during peak
winter months and 13 mmcf during the remainder of the year.

Gas production volume for 1999 averaged 41 mmcf per day and is expected to
continue at or near that level for the foreseeable future. The additional
production of 13 mmcf per day in winter and 28 mmcf per day in summer above the
Camuzzi volume commitment will be sold primarily to Metrogas S.A. and Camuzzi
under the terms of two separate Perez Companc master contracts in which the
Entre Lomas joint venture participates. Both contracts expire in March 2001. Any
additional gas production will be sold in the spot market to Genelba S.A., a
subsidiary of Perez Companc that owns and operates an electric power plant near
the city of Buenos Aires.

The gas sales prices contained in the previously described contracts vary
depending on seasonal demand, but in general, the peak season price will average
$1.45 per mcf while the summer season price will average $1.33 per mcf.

The Neuquen basin, wherein the Entre Lomas concession is located, is served by a
substantial gas pipeline network that delivers gas to the Buenos Aires
metropolitan and surrounding areas, the industrial regions of Bahia Blanca and
Rosario and by export pipelines to Chile. Entre Lomas is well situated in the
basin with two major pipelines in close proximity.

The above described contracts expire in the years 2001 and 2002. While the joint
venture partners have since deregulation of Argentina's gas industry in 1994,
been able to find markets for Entre Lomas gas, there can be no guarantee that
these contracts can be renewed or replaced. Failure to renew or replace these
contracts would have an adverse effect on the Company's cash flow and results of
operations.

TRANSPORTATION

Oil produced in the Entre Lomas concession is sold in Puerto Rosales, a major
industrial port in southern Buenos Aires Province, and is shipped there through
the Oleoductos del Valle S.A. ("Oldelval") pipeline system. From the concession,
oil is transported through the joint venture's 8 inch, 6 3/4 mile pipeline. This
line has a capacity of 16,000 barrels per day and is directly connected to the
Medanito-Allen leg of the system. Medanito-Allen, with a daily capacity of
130,000 barrels, transports oil to the Allen terminal. Two Oldelval lines,
originating in Allen, with a daily capacity of 175,000 barrels, complete the
journey to Puerto Rosales. The Entre Lomas joint venture's current volume
allocation in this pipeline system is 11,600 barrels per day. The system at this
time is operating at 90 percent of capacity.


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The cost to transport oil through this system and use the storage and handling
facilities in Puerto Rosales averaged $1.06 per barrel in 1999. Current
transportation tariffs were established by government decree in 1992.

PETROLERA

Petrolera was established for the express purpose of carrying out production and
development operations in the Entre Lomas area. Major investment and
distribution decisions are made by the joint venture and implemented by
Petrolera. Petrolera has a board of 11 directors, 5 of whom are nominees of the
Company and 6 of whom are nominees of Perez Companc or its affiliates. In 1999,
the shareholders of Petrolera reduced the number of directors from 15 to 11.
Petrolera's senior officers are generally the same as those of Perez Companc
with other general office and field personnel being employed exclusively by
Petrolera. The Company understands that Petrolera's sole business at present is
its role as joint venture operator.

The Company's branch office in Buenos Aires obtains from Petrolera operational
and financial data that is used to monitor joint venture operations. Whenever
possible, the branch provides technical assistance to Petrolera and makes
recommendations regarding field development and reservoir management.

DISTRIBUTIONS AND DIVIDENDS

In 1999, the Company received direct distributions of $5.0 million and Petrolera
dividends of $4.4 million. During 1998 and 1997, direct distributions totaled
$3.6 and $7.5 million, respectively, while Petrolera dividends totaled $1.5
million and $3.7 million, respectively. Future distributions and dividends are
necessarily dependent upon numerous factors, including among others, the joint
venture's ability to generate future earnings, the level and timing of future
investments in the concession, and fluctuations in crude oil and natural gas
prices.

DESCRIPTION OF THE CONCESSION

The Entre Lomas concession is located about 950 miles southwest of the city of
Buenos Aires on the eastern slopes of the Andes mountains. It straddles the
provinces of Rio Negro and Neuquen approximately 100 kilometers north of the
city of Neuquen. The concession produces oil and gas primarily from the Charco
Bayo/Piedras Blancas field complex ("CB/PB"). Two smaller fields, the Entre
Lomas and El Caracol fields, located to the northwest of the main field complex
also produce oil and gas. In 1996 the well Borde Mocho x-1, located southwest of
CB/PB, discovered oil and has since been on production. During 1999 a second
well in the Borde Mocho region of the concession was drilled and completed with
excellent results, confirming the existence of a reservoir with development
potential.

The largest oil producing formation is called Tordillo which in the CB/PB field
has generated 83 percent of all oil produced in the concession. The Tordillo
also produces associated gas which is consumed for field operations. Propane and
butane are extracted from this gas in the joint venture's gas processing plant.
Other important formations are the Quintuco, which produces gas in CB/PB and oil
in the Entre Lomas and El Caracol fields and the Petrolifera formation which
produces gas in the Entre Lomas gas field and some oil in CB/PB. Since inception
455 wells have been drilled in the concession, of which at year end, 280 are oil
wells, 19 are gas wells, 102 are water injection wells, 11 are water producing
wells, and 43 wells are inactive or abandoned.


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The CB/PB and El Caracol fields are secondary recovery projects. Water injection
has been introduced in CB/PB in phases since 1975. There still exist areas in
CB/PB which lack injection. The El Caracol field has been under injection since
1989. Secondary recovery operations commenced in the Entre Lomas oil field in
1998 and implementation of a field wide secondary recovery is currently
underway.

CHARCO BAYO/PIEDRAS BLANCAS FIELD

CB/PB produces principally from the Tordillo formation with some minor
production from the Petrolifera formation. Production in the CB/PB field
commenced in 1968, with the largest part of this complex developed before 1974.
Additional development drilling has continued through the present with two
significant drilling campaigns occurring during 1979-1981 and 1986-1988. These
two campaigns were the result of renegotiations of the original Entre Lomas
contract. Secondary recovery was introduced with a successful pilot in 1975 and
has slowly been expanded to include 83 injection wells. CB/PB can best be
described as a mature oil field with remaining potential. Development of this
field has historically been gradual due to the sporadic nature of past major
investment programs which, until the Entre Lomas area was converted to a
concession, occurred as a result of major renegotiations of the original
contract.

The field's ultimate development is likely to result from a combination of
expansion of secondary recovery throughout the entire producing field, selective
infill drilling, continued step out drilling, and recompletion of existing wells
with behind pipe reserves. The results of these programs can be enhanced, and
higher percentage recoveries achieved, by improving the efficiency of the
waterflood through various means. Such means include substantially increasing
the rate of water injection in areas of the field already under flood, modifying
existing patterns of injection, increasing lift capacity to handle greater
volumes of fluid by accelerating the conversion of wells from gas lift to pump,
placing idle wells back on production, and attempting to reduce the effects of
channeling of injection water.

Although the CB/PB waterflood has been in operation since 1975, there has been
insufficient water injected in some areas of the field already under injection
and other areas in which there has not been injection to date. As a result,
recoveries normally attributed to waterfloods after 15 to 20 years have not been
attained and it is currently estimated that this field has a remaining
productive life in excess of twenty years. Expansion and improvement of
secondary recovery throughout this field is a primary emphasis for the joint
venture.

Insofar as future drilling activity in the CB/PB field, it is felt that the
oil/water contact, or the lowest structural point at which oil can be produced,
is fairly well defined. Nevertheless, there remain undrilled step out locations
in the flanks of the structure and selective infill locations which should be
drilled in order to produce from areas of the field not currently drained by
existing wells. The level of development drilling activity in CB/PB will, of
course, be dependent on an oil price level that provides adequate returns for
the joint venture partners. During 1999, four additional wells were drilled and
completed as producers.

In the CB/PB field, the Quintuco formation is gas productive. Approximately 37
percent of gas sold by the joint venture is produced from a few gas wells
interspersed among the many Tordillo oil wells located on this structure.
Quintuco gas reserves in this field are believed to be fully developed.


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In 1992, the Argentine Department of Energy issued Resolution 105 requiring
environmental control. As a result, from 1993 through 1999, investments have
been made to change the system of produced water disposal in the Entre Lomas
concession. Until 1998, fresh water had been the sole source of injection in all
waterflood projects in the concession. Prior to 1996, produced water was
disposed of in evaporation and filtration pits, however, this practice was
forbidden by the province in that year. Produced water has since been injected
into a shallower formation with high injectivity capacity. Commencing 1998,
produced water in CB/PB began to be reinjected into the producing formation in a
portion of the field. Surface and down hole injection lines were replaced with
those that withstand the corrosive effects of reinjecting formation water. This
first phase of the conversion is now being evaluated.

EL CARACOL FIELD

The El Caracol field is located in the northwestern most part of the concession.
This field produces oil from the Quintuco formation. Thirty one wells have been
drilled here to date. Additional development drilling potential may still exist.
Water injection began here in 1989 and response has been favorable. Potential
for further expansion of the waterflood may also exist. During 1999, one
additional producing well was converted to injection.

ENTRE LOMAS/LOMAS DE OCAMPO FIELDS

The Entre Lomas structure is located in the central part of the concession to
the northwest of CB/PB. This anticline is cut by a fault near its crest. An oil
field exists on the southwest or upthrown side of this fault and a gas field
exists on the northeast or downthrown side.

OIL RESERVOIRS

The oil field is productive from the Quintuco formation, with some minor
production from the Tordillo formation. Quintuco continues to demonstrate
development potential toward the northwest. During the last three years, 21
development wells have been drilled and completed in this field, some with very
good results. Eight wells were drilled and completed in 1999. Over this time,
the size of the field has been extended in all directions, but principally to
the northwest. This field now includes 49 producing wells and contributes
approximately twenty five percent of oil produced in the concession. Additional
wells will be drilled in 2000. However, the plan to drill additional wells could
be altered in the event of a return to oil price levels experienced throughout
1998 and early 1999. Other risks that could affect the Company's plans are
described under "Forward-Looking Statements" on page 12.

The southeast, or older part of this field, has shown signs of pressure
depletion. The Quintuco formation responded favorably to water flooding in the
El Caracol field. Reservoir simulation studies have predicted that the Entre
Lomas field will have a similar response to secondary recovery. Investments to
implement waterflooding in this field commenced in 1997 and continued into 1999.
Water injection commenced in 1998. Secondary recovery will be expanded
throughout this field in the next two to three years.


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GAS RESERVOIRS

Deregulation of Argentina's gas industry in 1993 fueled considerable interest in
gas development throughout the country. As a result, a well drilled in 1970 that
had discovered significant gas potential from several sections of the
Petrolifera formation was placed on production at a rate of 8 mmcf per day.
Since then, nine wells have been drilled, of which eight are productive. Another
well drilled in the early 1970's was also put on production making a total of
nine wells on production in this field. Although the main body of this field
appears to have been defined, additional expansion possibilities exist to the
northwest. Late in 1997, the Lomas De Ocampo 4 well, drilled to the northwest of
the existing field was found to be productive in both the Petrolifera and
Quintuco formations. This well produced from the Quintuco formation during 1998
and 1999, leaving the Petrolifera intervals behind pipe. In 1999 the Lomas de
Ocampo 5 well located further to the northwest also found productive Petrolifera
sands. 3D seismic studies are currently being conducted to evaluate the
continuation of Petrolifera development to the northwest. The drilling of an
additional well is planned for 2000.

EXPLORATION

In the Entre Lomas concession, there are approximately 147,000 undeveloped
acres. Since inception, 455 wells have been drilled inside the concession of
which only a few have been drilled significant distances from the main producing
fields. Although the joint venture partners believe the major producing
structures have been identified and are being developed, the concession remains
relatively unexplored.

Since 1993, the Entre Lomas partners have conducted three seismic campaigns. The
most recent survey was completed in late 1998. As a result, the concession is
now covered by more than 500 square kilometers of 3D seismic that image the
principal producing fields and surrounding acreage believed to be of most
interest. These separate seismic programs have been successfully integrated into
one continuous seismic block. The seismic has multiple objectives the first of
which is finding lower risk exploration opportunities that target formations
known to be productive from structural closures and/or fault traps that exist
away from the principal producing field areas. Other important objectives are to
evaluate for high risk deep exploration potential in as yet unexplored
sedimentary sequences that exist between the base of the Petrolifera formation
and the basement floor, and utilize the 3D seismic in ways that may help exploit
the existing producing fields.

The second of the three seismic surveys was acquired in 1995. This 3D survey
proved helpful in the efficient development of the Entre Lomas gas field and the
current northwest extensions of both the Entre Lomas/Lomas de Ocampo oil and gas
fields. Interpretation of the just acquired 3D survey is currently ongoing and
so far it has been instrumental in selecting the location for the Borde Mocho #2
well discussed in the following section. The partners are at this time studying
the possibility of drilling a deep exploration test to the basement before the
end of the year. As is the case with all investments, drilling exploration wells
is dependent on an oil price that provides adequate returns for the joint
venture partners.

BORDE MOCHO

In early 1996, the joint venture partners drilled the Borde Mocho x-1 ("BM1")
well. This exploration well was completed in both the Quintuco and Tordillo
formations. Its performance over the years has been modest but its continued
steady rate of production revealed a potential for development of the
surrounding area. The location of the BM1 well was based on interpretation of 2D
seismic.


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In December 1999, the Borde Mocho #2 ("BM2") well was drilled and completed
about 1 1/2 kilometers from the BM1 in a structurally superior location that was
identified by 3D seismic. The BM2 found both the Quintuco and Tordillo
formations and during completion tested a combined rate in excess of 3,000
barrels per day. The well was put on production in late December from the
Tordillo at an initial rate of 600 barrels per day flowing. Production has
declined over the first 60 days, a behavior typical during the early life of a
Tordillo well. The Quintuco formation will now be produced separately for an
extended period. Since Borde Mocho is located several kilometers from the
concession's main production facilities and is not served by a pipeline or other
production installations, for the short-term, oil from the BM2 is being shipped
by truck. The well's behavior is being monitored closely in order to estimate
the size of the reservoir, size facilities appropriately, and select the
location for the next well. The partners expect to drill a third well in the
near future.

It should be noted that although the early results of this well are quite
positive, until the well is produced for extended periods from each formation
and reservoir pressures are monitored, there is insufficient information at this
time to accurately estimate the size of the producing reservoirs.


ACAMBUCO

The Company owns a 1.5 percent participation interest in the Acambuco joint
venture, an oil and gas exploration and development concession located in
Northwest Argentina, in the province of Salta, on the border with Bolivia. The
Acambuco concession covers an area of 267,000 acres.


DESCRIPTION OF THE CONCESSION

The Company has been a participant in the Acambuco area since 1981. The
principal objective in Acambuco is the Huamampampa formation, a deep fractured
limestone considered to have sizable gas exploration potential. In Acambuco,
Huamampampa is found at depths in excess of 14,000 feet. The Ramos and Aguarague
concessions, immediately to the south and east of Acambuco, have major gas
fields with significant gas production and reserves from Huamampampa. Acambuco
also has potential for oil development in shallower formations considered
secondary targets.

Acambuco is situated in an overthrust belt wherein drilling can be difficult and
costly not only because of the depths of the primary objectives, but also from
the risk of mechanical problems during drilling.

BACKGROUND

Three wells were drilled unsuccessfully in the early 1980's to depths ranging
from 16,000 to 18,000 feet. Although two wells gave indications of oil and gas
productive potential, they had to be abandoned for mechanical reasons.

Little activity occurred in Acambuco between 1983 and 1994 due to a lack of
market for potential gas. During the early to mid 1990's, the rapid growth of
demand for energy in southern Brazil generated significant interest in the
construction of pipelines to deliver gas from Bolivian and Northwest Argentine
gas producing basins to the markets of Sao Paulo and Rio de Janeiro. Due to
deregulation of the gas industry in Argentina in 1994, and as the Bolivia to
Brazil pipeline and the Atacamba and Norandino pipelines from the province of
Salta to northern Chile began to materialize, interest in the Acambuco area was
rekindled.


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In 1994, the Acambuco partners, consisting of Bridas S.A.P.I.C., Northwest
Argentina Corporation, and the Company, entered into a farmout agreement with
YPF whereby YPF received a 45 percent interest in the concession in exchange for
drilling, within five years, four exploration wells on four separate geologic
structures. The costs of the four wells were to be paid 100 percent by YPF.
Pursuant to the terms of the agreement, the San Pedrito x-1 ("SPx1") well was
drilled to depth of 14,500 feet. Due to mechanical problems, the well penetrated
only the uppermost section of the objective formation, the Huamampampa. For this
initial well, the Company exercised its non-consent option. The well had a
successful initial test. See "Current and Future Activity" later in this section
for a description of the results of a long-term production test conducted in
April.

In May 1996, YPF commenced drilling the second exploration well, the San Antonio
x-1, on a separate structure. One year later, the well reached its intended
depth of 15,700 feet at a cost of $36 million. The Company again exercised its
non-consent option. The well penetrated the Huamampampa formation in a
structurally unfavorable position and produced water. However, this well tested
oil in a secondary target, the Tupambi formation. Confirmation of oil potential
in the Tupambi is now a primary objective in this structure. The Huamampampa
formation is still considered prospective.

In 1997, Bridas and Amoco Argentina S.A. formed a strategic alliance by
combining certain of each Company's oil and gas assets in the southern cone of
South America. In the combination Pan American Energy Investments Ltd. ("PAE")
was formed to hold the combined assets including Acambuco. Subsequently in
January 1998, YPF assigned to O & G Developments Ltd., a wholly owned subsidiary
of PAE, 22.5 percent, or one-half of the 45 percent interest it had acquired in
the 1994 farmout agreement, in exchange for cancellation of YPF's remaining
obligation to drill the last two wells of its four well drilling commitment. PAE
became the operator of the concession.

In mid 1998, Shell C.A.P.S.A. purchased O & G Development's Ltd's 22.5 percent
interest. The Acambuco joint venture now consists of Pan American Energy
(representing Amoco and Bridas) with 52 percent, Shell and YPF, with 22.5
percent each, and the Company and Northwest Argentina with 1.5 percent each.

CURRENT AND FUTURE ACTIVITY

In September 1998, the Acambuco partners commenced drilling the San Pedrito x-2
("SPx2") well at a location approximately 3 miles south of the SPx1 discovery
well. After 15 months of drilling, the well reached a total depth of 16,800 feet
penetrating almost the entire Huamampampa section. Although the well encountered
Huamampampa in a structural position that is 1,200 feet lower than SPx1 well, in
late February 2000, the well successfully tested daily volumes of 20 million
cubic feet and 350 barrels of condensate with no water. The joint venture plans
to drill the San Pedrito x-3 well later in the year.

The total cost of SPx1 reached $50 million ($750 thousand net to the Company)
due to problems encountered while drilling through over-pressured formations in
a structure that is extremely folded and faulted.

In April 1999 a successful long term production test was conducted in the SPx1.
The maximum daily volume achieved in this test was 32 million cubic feet and 470
barrels of condensate. This test indicates that the Huamampampa reservoir in the
San Pedrito structure is extensive, is capable of


                                       10
<PAGE>   11


long term production, and should be developed. As described previously, the
Company exercised its non-consent option for this well and will share in its
future revenue stream after its partners reach a 300% payout limited to this
well.

A second exploration well, the Cerro Tuyunti x-1 ("CTx1") commenced drilling in
January 1999 on the largest of the structures in the concession. In December,
the well reached a total depth of 20,300 feet. During drilling, this well
encountered several reverse faults that caused unexpected repetitions of the
Tupambi formation. For this reason, Huamampampa was found at a depth much
greater than planned. In late January 2000, the well flowed non-commercial
volumes of gas. The results of this initial test are being analyzed. The joint
venture expects to return to this well in the near future to test the Tupambi
formation that has produced in oil fields close to Acambuco. The total cost of
this well reached $43 million, ($645 thousand net to the Company).

Exploration activity in the concession will remain strong through the end of
2001 and the joint venture plans to invest in excess of $100 million, ($1.5
million net to the Company) in the year 2000. The Company participated in both
the SPx2 and CTx1 wells, and at this time, plans to participate in all wells
drilled this year and next. The Company's future participation in Acambuco wells
is subject to the risk of unfavorable oil and gas prices that could adversely
impact its future cash flow, and to other risks described under "Forward-Looking
Statements" on page 12.

In late February 2000, the joint venture commenced drilling the Macueta
x-1001(bis). Projected total depth is 16,700 feet and the estimated cost is $30
million ($450 thousand net to the Company). The well is located close to the San
Alberto block wherein a significant gas discovery was made on the opposite side
of the Bolivian border.

MARKETS

The first major international pipeline to supply gas to markets in Sao Paulo and
Rio de Janeiro is the Bolivia to Brazil pipeline commonly referred to as the
"BTB Pipeline". This 32 inch, 1,800 kilometer line went into operation in April
1999. The line commences at Rio Grande/Santa Cruz, Bolivia and currently extends
to Sao Paulo. Estimated to cost approximately $2 billion, the line's capacity is
1 BCF per day. This line is expected to operate at full capacity within three
years. Current plans are to extend the line from Sao Paulo to Rio de Janeiro and
the southern Brazilian city of Porto Allegre.

The contractual commitments to supply gas to southern Brazil through the BTB
Pipeline give preference to Bolivian gas. Approximately 8 trillion cubic feet of
gas reserves are needed to fill the line to capacity for twenty years. When
construction of the line commenced, there were insufficient Bolivian reserves to
satisfy commitments and it was believed the line would have capacity
availability for gas produced in Northwest Argentina. Due to significant
exploration activity that resulted from deregulation of the Bolivian energy
sector, during the two last years, gas reserves in southern Bolivia have
increased to 15 TCF. It now appears that gas produced in the Acambuco region
will not have access to the BTB line.

Construction of facilities in Acambuco that include gathering lines, a gas
pipeline, and a gas treatment plant will be built later in the year. The
partners expect to start selling San Pedrito gas to Argentine markets before
year end.


                                       11
<PAGE>   12


CANADON RAMIREZ

On September 30, 1997, in exchange for its commitment to pay $1.75 million for
exploration and well workovers, the Company acquired a 45 percent interest in
the 92,000 acre Canadon Ramirez concession, located in southern Argentina, in
Chubut province. This region produces hydrocarbons from the Golfo San Jorge
basin, the oldest oil producing province in the country.

The Company obtained its interest in Canadon Ramirez from Pan Am Group S.A.
("Pan Am"), owned by the Melhem family in Argentina. A third partner in the
concession is ROCH S.A. which holds a 10 percent interest and is operator.

During the 1980's YPF drilled eighteen wells in Canadon Ramirez, with several
giving evidence of potential oil production. Objective formations in the area
are fairly shallow and occur at depths of less than 6,000 feet. Production
operations have never been conducted in the block, hence it is considered
exploratory in nature. The Company's investment commitment was fulfilled by mid
1998 and included well workovers and recompletions, extended production testing,
and reprocessing and reinterpretation of existing seismic. Insufficient oil was
found to merit additional investment. Efforts to sell the property are currently
underway.

FORWARD-LOOKING STATEMENTS

Certain matters discussed in this report, excluding historical information,
include forward-looking statements. Although the Company believes such
forward-looking statements are based on reasonable assumptions, no assurance can
be given that every objective will be reached. Such statements are made in
reliance on the safe harbor protections provided under the Private Securities
Litigation Reform Act of 1995.

As required by such Act, the Company hereby identifies the following important
factors that could cause actual results to differ materially from any results
projected, forecasted, estimated or budgeted by the Company in forward-looking
statements: risks and uncertainties impacting the Company as a whole relate to
changes in general economic conditions in Argentina; future unpredictability and
volatility of product prices, in particular oil prices, which can be affected by
political events in producer nations; the availability and cost of capital;
changes in laws and regulations to which the Company is subject, including tax,
environmental and employment laws and regulations; the cost and effects of legal
and administrative claims and proceedings against the Company or its
subsidiaries or which may be brought against the Company. It is also possible
that certain aspects of the Company's business that are currently unregulated
may be subject to regulation in the future.


                                       12
<PAGE>   13


ITEM 2.        PROPERTIES

See ITEM 1 (c) for a description of properties.

ITEM 3.        LEGAL PROCEEDINGS

Other than as described in the financial statements, there are no material
pending legal proceedings to which the Company is a party.

ITEM 4.        SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

None.


                                       13
<PAGE>   14


                                   P A R T II


ITEM 5.        MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
               MATTERS

At December 31, 1999, there were 1,146 record holders of the Company's ordinary
shares, $0.01 par value. The ordinary shares are traded sporadically in the
over-the-counter market. The Company understands that the trades which occur are
made both at the quoted market price or on a negotiated basis outside of the
quoted market. The high and low bid prices listed below were provided to the
Company by the National Association of Securities Dealers Automated Quotation
System (NASDAQ).

The Company currently pays its shareholders a quarterly dividend of 16.25 cents
per share. Future dividends are necessarily dependent upon numerous factors,
including, among others, earnings, levels of capital spending, changes in
governmental regulations and changes in crude oil and natural gas prices. The
Company reserves the right to change the level of dividend payments or to
discontinue or suspend such payments at the discretion of the Directors.

<TABLE>
<CAPTION>
                                                      Stock Price
                                                     --------------
                                                     High       Low     Dividend
                                                     ----       ---     --------
<S>                        <C>                    <C>        <C>       <C>
Quarter of 1999
                            First                 $ 19 3/4   $ 13 1/2   $.16 1/4
                            Second                  22 1/2     14        .16 1/4
                            Third                   19 1/2     16 1/4    .16 1/4
                            Fourth                  31 1/2     15 3/4    .16 1/4

Quarter of 1998
                            First                 $ 31 1/2   $ 26 1/4   $.16 1/4
                            Second                  29         24        .16 1/4
                            Third                   25         18        .16 1/4
                            Fourth                  23         17        .16 1/4
</TABLE>

The Company has been advised that: a Cayman Islands company may not pay
dividends to shareholders out of its share capital or share premium account;
there are no Cayman Islands laws, decrees or regulations relating to
restrictions on the import or export of capital or exchange controls affecting
remittances of dividends, interest and other payments to non-resident holders of
the Company's ordinary shares; there are no limitations either under the laws of
the Cayman Islands or under the Company's Memorandum or Articles of Association
restricting the right of foreigners to hold or vote the Company's ordinary
shares; there are no existing laws or regulations of the Cayman Islands imposing
taxes or containing withholding provisions to which United States holders of the
Company's ordinary shares are subject; and there are no reciprocal tax treaties
between the Cayman Islands and the United States.


                                       14
<PAGE>   15


ITEM 6.        SELECTED FINANCIAL DATA
<TABLE>
<CAPTION>
                                   1999      1998      1997      1996      1995
                                 -------   -------   -------   -------   -------

<S>                              <C>       <C>       <C>       <C>       <C>
(Dollars in thousands
except per share amounts)

Revenues                         $40,736   $34,105   $48,009   $46,765   $36,942


Net Income                         9,488     3,368    13,023    12,661     8,268

Income per
Ordinary Share,
Basic and Diluted                   1.29       .46      1.77      1.72      1.12

Dividends Declared per
Ordinary Share                       .65       .65       .65       .65      .975

Total Assets at
December 31                       71,001    62,274    64,990    55,684    46,498

Stockholders' Equity at
December 31                       55,105    50,401    51,817    43,578    35,702
</TABLE>

                                       15
<PAGE>   16


ITEM 7.        MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
               RESULTS OF OPERATIONS

LIQUIDITY AND CAPITAL RESOURCES

CASH FLOW

The Company and its Entre Lomas partners continue their efforts to maximize cash
flow from the Entre Lomas concession. During 1999, the Company received $9.4
million in distributions and dividends compared with $5.1 million and $11.2
million in 1998 and 1997, respectively.

Receipt of future distributions and dividends will depend on the joint venture's
ability to generate earnings, cash availability exceeding capital requirements,
stable oil and gas prices, and continued ability to repatriate funds free from
government control and restrictions.

OIL PRICES

During the last three years oil prices have behaved in a volatile manner. The
Company's sales price per barrel of oil averaged $19.52 in 1997, starting with a
high for the year of $24 in January, falling to $17 by year's end. In 1998, the
per barrel sales price continued to fall, averaging $12.71 and starting with a
high of $16 in January, then falling to $10 by year end. Such a low price had
not been seen since the oil price collapse of 1986. Prices were even more
volatile in 1999, changing direction and climbing to over $25 by year end and as
high as $30 by March 2000, a level not seen since the Persian Gulf War in 1990.
During 1999, the Company's sales price per barrel averaged $17.75.

Nineteen ninety-seven was the end of a brief period of favorable world oil
prices. During that period, energy companies around the world benefited from the
favorable price environment and exploration and development investments surged
worldwide leading to increases in oil production. In late 1997, the Organization
of Petroleum Exporting Countries ("OPEC") increased production targets. That
decision occurred as the Far East Asian and Russian economic crises began to
worsen and chain react through Latin America and other developing regions. The
result was an oversupply of oil that led to the sharp drop in oil price in 1998
and early 1999.

With the drop in prices, energy companies were forced to cut exploration and
development investments sharply throughout 1998 and early 1999, while OPEC
implemented important reductions in production quotas in March. Commodities
markets reacted favorably to OPEC's decision and oil prices began to rise. By
mid 1999, the Far East Asian economies began to recover and this combination of
events resulted in a shortage of oil that has led to the recent price increase.

These large swings in oil prices have been the primary contributor to the recent
fluctuations in the Company's net income and cash flow from operations. Over the
last three years, the Company has generated net income of $9.5 million in 1999,
$3.4 million in 1998, and $13 million in 1997.


                                       16
<PAGE>   17


OIL PRODUCTION

Entre Lomas oil production for 1999 totaled 3.57 million barrels, or 1.7 million
net to the Company. This was three percent below the previous year's production
of 3.69 million barrels, or 1.75 million net. Production trended down through
most of the year averaging 9,400 barrels per day during the last quarter. Recent
successes in drilling should help to improve production levels for the year
2000. As of March, daily production exceeded 10,000 barrels, or 4,800 barrels
net to the Company.

Natural gas production during the year was lower mostly due to market
restrictions during Argentina's summer months. Concession production for the
year totaled 14.8 billion cubic feet ("bcf"), or 7.1 bcf net to the Company, as
compared with 16.2 bcf, or 7.7 bcf net during 1998.

CAPITAL SPENDING

The Company is strategically committed to the long-term development of the Entre
Lomas concession. In spite of the sharp decline in oil sales prices during 1998
and early 1999, the Entre Lomas partners invested $23 million, or $11 million
net to the Company, in exploration, development, and other major expense items
such as workovers. In addition to the above mentioned workovers, the major
components of 1999's investment program included, drilling, the continued
implementation of secondary recovery in the Entre Lomas oil field,
interpretation of 3D seismic, and phase one of a project to convert to rod pump
all remaining gas lift wells in the CB/PB field. This project estimated to cost
approximately $10 million, or $4.8 million net, includes converting almost 100
wells to rod pump and should be completed by the end of 2000. In addition to
enabling a more efficient extraction of fluid in the CB/PB field, associated gas
previously consumed in the operation of the gas lift system will be available
for sale.

During 2000, the Entre Lomas partners plan to invest $29 million, or $14 million
net to the Company, including major expense items. As in years past, the full
amount is expected to be paid for by internally generated cash flow.

ACAMBUCO

As described on page 10, under "Current and Future Activity", the Acambuco joint
venture plans to invest in excess of $100 million during 2000. The Company's net
share is equivalent to $1.5 million. Although the Company did not participate in
the drilling of the San Pedrito x-1 and San Antonio x-1 exploration wells. It
has participated in the two wells drilled since, and plans to continue
participating in future wells.

DIVIDENDS

The Company currently pays its shareholders a quarterly dividend of 16.25 cents
per share. Future dividends are necessarily dependent on numerous factors,
including among other, earnings, levels of capital spending, changes in
governmental regulations, and fluctuations in crude oil and natural gas prices.

The Company reserves the right to change the level of dividend payments or to
discontinue or suspend such payments at the discretion of the directors.

YEAR 2000 COMPLIANCE

During 1999, most companies faced a potentially serious information systems
problem because many software applications and the operational programs written
in the past would not properly recognize calendar dates beginning in the year
2000. This problem had the potential to force


                                       17
<PAGE>   18


computers to shut down or provide incorrect data or information. Petrolera, the
operator of the Entre Lomas concession, from which the Company derives
one-hundred percent of its operating revenue, carried out the process of
identifying changes required to computer programs to safeguard the critical
aspects of the joint venture's business that guaranteed continuation of its
production and sales operations, including major interfaces with customers and
suppliers such as pipelines that carry products to market and companies that
provide power to the concession.

Petrolera completed an inventory of all equipment and software that could be
affected by the change of the century, and evaluated modifications required to
become Year 2000 compatible. During the year, new financial, accounting and
administrative systems were put in place that are fully compatible. By the end
of 1999, Petrolera achieved the fundamental objective of full Year 2000
compliance of the systems over which it has direct control at a cost not
material to the joint venture's business, financial condition, or results of
operation. Petrolera also monitored compliance efforts by major third party
companies upon which the Entre Lomas concession depends.

As the year changed and through March of 2000, Petrolera and the Company have up
to now detected no manifestations of the year 2000 bug or any interruptions to
the joint venture's production or sales operations, or the operations of any
third party companies upon which the Entre Lomas joint venture depends.

FOREIGN OPERATIONS

As described on page 20, under "Argentine Economic and Political Environment"
the Company believes that its Argentine operations present minimal currency
risk. Argentina's inflation rate was less than 1 percent in 1999. The
governments' convertibility law essentially guarantees an exchange rate of one
Argentine peso to one U.S. dollar.

RESULTS OF OPERATIONS

REFER TO CONSOLIDATED STATEMENT OF OPERATIONS ON PAGE 24.

1999 VS 1998

During 1999, the Company generated net income of $9.5 million compared with $3.4
million during 1998. The primary reasons for the increase are explained in the
following paragraphs

The improvement in net income is primarily due to increased operating revenues
resulting from higher oil sales caused by the sharp rise in the Company's oil
sales price. Operating revenues increased by $6.9 million or 21 percent. The
factors that gave rise to the price increase are explained previously under
"Liquidity and Capital Resources - Oil Prices" on page 16. Average oil sales
prices for the current and prior two years are listed in the table of "Sales and
Price Statistics" on page 38.

The improvement in oil price was complemented by a decrease in operating
expenses due to a reduced volume of workovers performed during 1999, personnel
reductions implemented in the Entre Lomas concession, and the cessation of
operations in Canadon Ramirez. In 1998, the Company was incurring expenses
related to its Canadon Ramirez work commitment.


                                       18
<PAGE>   19


The decrease in selling and administrative expenses was primarily the result of
severance and contract termination costs recorded in 1998.

The decrease in exploration expenses is directly related to the expensing of 3D
seismic costs incurred in the Entre Lomas concession in 1998. Exploration
expense in 1999 was limited to costs associated with the Acambuco exploration
program and interpretation of Entre Lomas 3D seismic.

Provincial royalties increased from year to year due to the increase in oil
sales, and Argentine taxes increased as a result of higher before tax income.


1998 VS 1997

During 1998, the Company generated net income of $3.4 million compared with $13
million during 1997. The primary reasons for the decrease are explained in the
following paragraphs.

Operating revenues decreased by $13.7 million, or 30 percent, compared with
1997, due to sharply lower oil prices as explained under "Liquidity and Capital
Resources - Oil Prices" on page 16.

The increase in selling and administrative expenses was primarily the result of
severance and contract termination costs recorded during 1998.

Completion of the 3D seismic program, in the Entre Lomas concession in 1998, and
exploration expenses incurred in both the Acambuco and Canadon Ramirez
concessions caused the increase in exploration expense.

Provincial royalties decreased from year to year due to the decrease in oil
sales, and Argentine taxes decreased as a result of lower before tax income.


ITEM 7a. QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISKS

The Company's operations are exposed to market risks as a result of changes in
commodity and foreign currency exchange rates.

COMMODITY PRICE RISK

The Company produces and sells crude oil and natural gas. As a result, the
Company's financial results can be significantly impacted by fluctuations in
commodity prices due to changing market forces.

FOREIGN CURRENCY AND OPERATIONS RISK

The Company's operations are located in Argentina. Therefore, the Company's
financial results may be affected by factors such as changes in foreign currency
exchange risks, weak economic conditions, or changes in Argentina's political
climate.


                                       19
<PAGE>   20


ARGENTINE ECONOMIC AND POLITICAL ENVIRONMENT

Since 1989, Argentina's government has pursued free market policies, including
the privatization of state-owned companies, deregulation of the oil and gas
industry, that included the successful sale of YPF shares in public markets, tax
reform to equalize income tax rates for domestic and foreign investors,
liberalization of import and export laws, and the lifting of exchange controls.

The cornerstone of the country's economic reforms since 1989 has been its change
in monetary policy. In April 1991, the convertibility law was implemented
establishing an exchange rate of one Argentine peso to one U.S. dollar. The
convertibility plan requires that the country's monetary base be backed by an
equivalent amount of international reserves, including U.S. dollars and gold.
Essentially, the policy guarantees an exchange rate of 1:1. The Argentine
government has not strayed from this policy since implementation of the plan.

These policies have been successful as evidenced, first, by a reduction in
annual inflation from the 1989 rate of 5,000 percent to less than 1 percent in
1999 and, second, an influx of foreign investment capital into the country.

Presidential elections occurred in 1999. President Carlos Menem, who enacted the
privatization, deregulation, and monetary policies described above, completed
his second and final term. The new President, Fernando De la Rua of the Alianza
party, assumed office on December 10. He has stated his intent to preserve
Argentina's commitment to the convertibility law.

Since 1991, the convertibility law and the Argentine pesos one to one parity
with the US dollar have withstood the 1994 devaluation of Mexico's currency that
shocked banking systems throughout Latin America, the resignation in July, 1996
of Domingo Cavallo, President Menem's first Economy Minister and author of the
convertibility plan, the far East Asian and Russian financial crises of 1997 and
1998, and most recently the devaluation of Brazil's currency in early 1999 which
has had an adverse impact on Argentina's exports to Brazil, Argentinas largest
trading partner. After growing at rates of 8 percent in 1997 and 4 percent in
1998, Argentina's gross domestic product contracted by 3.5 percent in 1999 owing
in large part to Brazil's currency devaluation.

Argentina is a part of "Mercosur" a common market established by customs
agreements between Argentina, Brazil, Uruguay, and Paraguay. The "Mercosur"
market comprises a population of approximately 200 million with a total gross
domestic product of $1.1 trillion.


                                       20
<PAGE>   21


ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA



                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS


<TABLE>
<CAPTION>
                                                                                                            Page
                                                                                                            ----
<S>                                                                                                          <C>
Report of Independent Public Accountants                                                                     22

Consolidated Balance Sheets
  December 31, 1999 and 1998                                                                                 23

Consolidated Statements of Operations
  Three Years Ended December 31, 1999                                                                        24

Consolidated Statements of Stockholders' Equity
  Three Years Ended December 31, 1999                                                                        25

Consolidated Statements of Cash Flows
  Three Years Ended December 31, 1999                                                                        26

Notes to Consolidated Financial Statements                                                                   27
</TABLE>


Schedules--All schedules have been omitted, as the required information has been
included in the consolidated financial statements and notes thereto, or because
the schedules are not applicable or required.


                                       21
<PAGE>   22


                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS


To the Stockholders of Apco Argentina Inc.:

We have audited the accompanying consolidated balance sheets of Apco Argentina
Inc. (a Cayman Islands corporation) and subsidiary as of December 31, 1999 and
1998 and the related consolidated statements of operations, stockholders' equity
and cash flows for each of the three years in the period ended December 31,
1999. These financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these financial
statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to obtain reasonable assurance about whether the financial statements are free
of material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Apco Argentina Inc. and
subsidiary as of December 31, 1999 and 1998, and the results of their operations
and their cash flows for each of the three years in the period ended December
31, 1999, in conformity with accounting principles generally accepted in the
United States.



                                                             ARTHUR ANDERSEN LLP


Tulsa, Oklahoma
March 3, 2000


                                       22
<PAGE>   23



                       APCO ARGENTINA INC. AND SUBSIDIARY

                           CONSOLIDATED BALANCE SHEETS



<TABLE>
<CAPTION>
                                                              December 31,
                                                           --------------------
(Amounts in Thousands)                                       1999        1998
                                                           --------    --------

<S>                                                        <C>         <C>
ASSETS

Current Assets:
       Cash and cash equivalents                           $ 14,207    $ 13,596
       Accounts receivable                                    7,967       5,653
       Inventory                                                892         865
       Other current assets                                     461         472
                                                           --------    --------

         Total Current Assets                                23,527      20,586
                                                           --------    --------


Property and Equipment:
       Cost                                                  87,724      79,596
       Accumulated depreciation                             (43,569)    (38,458)
                                                           --------    --------

                                                             44,155      41,138
                                                           --------    --------

Other Assets                                                  3,319         550
                                                           --------    --------

                                                           $ 71,001    $ 62,274
                                                           ========    ========

LIABILITIES AND STOCKHOLDERS' EQUITY

Current Liabilities:
       Accounts payable                                    $  3,127    $  5,415
       Accrued liabilities                                    6,000       2,092
       Dividends payable                                      1,196       1,196
       Other liabilities                                      1,189        --
                                                           --------    --------

         Total Current Liabilities                           11,512       8,703
                                                           --------    --------


Long-term liabilities                                         4,027       3,170
Deferred income taxes                                           357        --

Stockholders' Equity, per accompanying statements:
       Ordinary shares, par value $.01 per share;
           15,000,000 shares authorized;
           7,360,311 shares outstanding                          74          74
       Additional paid-in capital                             9,326       9,326
       Retained earnings                                     45,705      41,001
                                                           --------    --------

         Total Stockholders' Equity                          55,105      50,401
                                                           --------    --------

                                                           $ 71,001    $ 62,274
                                                           ========    ========
</TABLE>

The accompanying notes are an integral part of these consolidated statements.


                                       23
<PAGE>   24


                       APCO ARGENTINA INC. AND SUBSIDIARY

                      CONSOLIDATED STATEMENTS OF OPERATIONS


<TABLE>
<CAPTION>
                                                   For the Years Ended December 31,
                                                   --------------------------------

(Amounts in Thousands Except Per Share)                1999      1998      1997
                                                     -------   -------   -------
<S>                                                  <C>       <C>       <C>
REVENUES:
    Operating revenues                               $40,252   $33,333   $47,065
    Other revenues                                       484       772       944
                                                     -------   -------   -------

                                                      40,736    34,105    48,009
                                                     -------   -------   -------

COST AND EXPENSES:
    Operating expense                                 11,074    13,286    12,732
    Provincial royalties                               4,441     3,577     4,936
    Transportation & storage                           1,803     1,997     2,040
    Selling and administrative                         1,971     3,027     1,891
    Depreciation, depletion and amortization           5,252     4,568     4,761
    Exploration expense                                  473     1,358       313
    Argentine taxes                                    5,928     2,543     7,035
    Other expense, net                                   306       381     1,278
                                                     -------   -------   -------

                                                      31,248    30,737    34,986
                                                     -------   -------   -------


NET INCOME                                           $ 9,488   $ 3,368   $13,023
                                                     =======   =======   =======


INCOME PER ORDINARY SHARE, Basic and Diluted         $  1.29   $  0.46   $  1.77
                                                     =======   =======   =======


AVERAGE ORDINARY SHARES
 OUTSTANDING, Basic and Diluted                        7,360     7,360     7,360
                                                     =======   =======   =======
</TABLE>


The accompanying notes are an integral part of these consolidated statements.


                                       24
<PAGE>   25


                       APCO ARGENTINA INC. AND SUBSIDIARY

                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY



<TABLE>
<CAPTION>
(Amounts in Thousands)                  Ordinary Shares   Additional
                                       -----------------    Paid-in    Retained
                                       Shares     Amount    Capital    Earnings
                                       ------     ------    -------    --------

<S>                                   <C>        <C>        <C>        <C>
BALANCE, January 1, 1997                 7,360   $     74   $  9,326   $ 34,178

     Net income                           --         --         --       13,023

     Dividends declared
          ($ 0.65 per share)              --         --         --       (4,784)
                                      --------   --------   --------   --------

BALANCE, December 31, 1997               7,360         74      9,326     42,417

     Net income                           --         --         --        3,368

     Dividends declared
          ($ 0.65 per share)              --         --         --       (4,784)
                                      --------   --------   --------   --------

BALANCE, December 31, 1998               7,360         74      9,326     41,001

     Net income                           --         --         --        9,488

     Dividends declared
        ($ 0.65 per share)                --         --         --       (4,784)
                                      --------   --------   --------   --------

BALANCE, December 31, 1999               7,360   $     74   $  9,326   $ 45,705
                                      ========   ========   ========   ========
</TABLE>


The accompanying notes are an integral part of these consolidated statements.


                                       25
<PAGE>   26

                       APCO ARGENTINA INC. AND SUBSIDIARY

                      CONSOLIDATED STATEMENTS OF CASH FLOWS


<TABLE>
<CAPTION>
                                                       For the Years Ended December 31,
                                                       --------------------------------
                                                        1999          1998       1997
                                                        ----          ----       ----

<S>                                                     <C>         <C>         <C>
(Amounts in Thousands)

CASH FLOW FROM OPERATING ACTIVITIES:

Net income                                              $  9,488    $  3,368    $ 13,023
Adjustments to reconcile to cash
provided by operating activities:
 Depreciation, depletion and amortization                  5,252       4,568       4,761
 Abandonment of well drilled in prior year                    23        --          --
 Changes in accounts receivable                           (2,314)      1,375        (653)
 Changes in inventory                                        (27)      1,612       1,621
 Changes in other current assets                              11        (145)         37
 Changes in accounts payable                              (2,288)      2,688        (108)
 Changes in accrued liabilities                            3,908      (3,956)        361
 Other                                                      (366)        208         156
                                                        --------    --------    --------


 Net cash provided by operating activities                13,687       9,718      19,198

CASH FLOW FROM INVESTING ACTIVITIES:

 Capital expenditures                                     (8,292)    (12,521)    (12,184)

CASH FLOW FROM FINANCING ACTIVITIES:

 Dividends paid                                           (4,784)     (4,784)     (4,784)
                                                        --------    --------    --------

NET CHANGES IN CASH AND
 CASH EQUIVALENTS                                            611      (7,587)      2,230

CASH AND CASH EQUIVALENTS AT
 BEGINNING OF PERIOD                                      13,596      21,183      18,953
                                                        --------    --------    --------

CASH AND CASH EQUIVALENTS AT
 END OF PERIOD                                          $ 14,207    $ 13,596    $ 21,183
                                                        ========    ========    ========
Supplemental disclosures of cash flow information:

 Cash paid during the year for Argentine income taxes   $  1,926    $  3,916    $  7,451
</TABLE>


The accompanying notes are an integral part of these consolidated statements.


                                       26
<PAGE>   27


                       APCO ARGENTINA INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(1)            BASIS OF PRESENTATION AND SUMMARY OF ACCOUNTING POLICIES

               GENERAL AND PRINCIPLES OF CONSOLIDATION

               The consolidated financial statements include the accounts of
               Apco Argentina Inc. (a Cayman Islands corporation) and its wholly
               owned subsidiary, Apco Properties Ltd. (a Cayman Islands
               corporation), which are herein collectively referred to as the
               Company. The Company has only one business segment and is engaged
               exclusively in joint ventures in oil and gas exploration,
               development and production in Argentina. Its principal business
               is a 47.6 percent participation in the Entre Lomas Concession,
               which is accounted for following the proportional consolidation
               method. All of the Company's revenues and all of its long lived
               assets are in Argentina.

               The Williams Companies, Inc. ("Williams") owns 68.96 percent of
               the outstanding ordinary shares of the Company.

               Oil and gas operations are risky in nature. A successful
               operation requires that a company deal with uncertainties about
               the subsurface that even a combination of experience, scientific
               information and careful evaluation cannot always overcome.

               Because the Company's assets are located in Argentina,
               management, in previous years, was required to deal with threats
               from inflation, devaluation and currency controls (see Note 9).
               Since 1991, the economic and political environment in the country
               has improved dramatically due to free market economic policies
               implemented by the government of President Carlos Menem. These
               policies have resulted in significantly reducing inflation and
               stabilization of the Argentine peso.

               The preparation of financial statements in conformity with
               accounting principles generally accepted in the United States
               requires management to make estimates and assumptions that affect
               the reported amounts of assets and liabilities and disclosure of
               contingent assets and liabilities, if any, at the date of the
               financial statements, and the reported amounts of revenues and
               expenses during the reporting period. Actual results could differ
               from those estimates.

               PROPERTY AND EQUIPMENT

               The Company uses the successful-efforts method of accounting for
               oil and gas exploration and production operations, whereby costs
               of acquiring non-producing acreage, costs of drilling successful
               exploration wells and development costs are capitalized. Costs of
               unsuccessful drilling are expensed as incurred. Oil and gas
               properties are depreciated over their productive lives using the
               units of production method based proved reserves. Non oil and gas
               property is recorded at cost and is depreciated on a
               straight-line basis, using estimated useful lives of 3 to 15
               years.


                                       27
<PAGE>   28


                       APCO ARGENTINA INC. AND SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued


               The Company reviews its proved properties for impairment on a
               concession by concession basis and recognizes an impairment
               whenever events or circumstances, such as declining oil and gas
               prices, indicate that a property's carrying value may not be
               recoverable. If an impairment is indicated then a provision is
               recognized to the extent that the carrying value exceeds the
               present value of the estimated future net revenues ("fair
               value"). In estimating future net revenues, the Company assumes
               costs will escalate annually and applies an oil and gas price
               forecast that it believes to be reasonable after reviewing
               long-term forecasts of professional energy consultants. Due to
               the volatility of oil and gas prices, it is possible that the
               Company's assumptions regarding oil and gas prices may change in
               the future. For the years ended December 31, 1999, 1998 and 1997,
               the Company did not record any impairment expense as the
               estimated future undiscounted net revenues exceeded the carrying
               value of its properties.

               NET INCOME PER ORDINARY SHARE

               Net income per ordinary share is based on the weighted average
               number of ordinary shares outstanding. Basic and diluted net
               income per ordinary share are the same as the Company has not
               issued any potentially dilutive securities such as stock options.

               FOREIGN EXCHANGE

               The general policy followed in the translation of the Company's
               financial statements of foreign operations into United States
               dollars is in accordance with Statement of Financial Accounting
               Standards No. 52, using the United States dollar as the
               functional currency.

               INCOME TAXES

               Provision is made for deferred income taxes applicable to
               temporary differences between the financial statements and tax
               basis of the assets and liabilities, if any.

               RECLASSIFICATIONS

               Certain amounts in the 1998 and 1997 Consolidated Statements of
               Operations have been reclassified to conform to the 1999
               presentation format. These changes have no impact on net income
               for those years.

               RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

               In June 1998, the FASB issued Statement of Financial Accounting
               Standards No. 133, Accounting for Derivative Instruments and
               Hedging Activities ("SFAS No. 133"). SFAS No. 133 establishes
               accounting and reporting standards requiring that every
               derivative instrument (including certain derivative instruments
               embedded in other contracts) be recorded in the balance sheet as
               either an asset or liability measured at its fair value. SFAS No.
               133 requires that changes in the derivative's fair value be
               recognized currently


                                       28
<PAGE>   29


                       APCO ARGENTINA INC. AND SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued


               in earnings unless specific hedge accounting criteria are met.
               Special accounting for qualifying hedges allows a derivative's
               gains and losses to offset related results on the hedged item in
               the income statement. Companies must formally document,
               designate, and assess the effectiveness of transactions that
               receive hedge accounting.

               In June 1999, the FASB issued Statement of Financial Accounting
               Standards No. 137, which amended SFAS No. 133 to extend the
               effective date of adoption for fiscal periods after June 15,
               2000. Further, SFAS 137 requires companies to either (a)
               recognize as an asset or liability in the balance sheet all
               embedded derivative instruments at the date of initial
               application or (b) select either January 1, 1998 or January 1,
               1999 as an application date, and only those derivatives issued,
               acquired, or substantively altered on or after that date shall be
               recognized in the balance sheet. SFAS Nos. 133 and 137 have no
               impact on the Company's financial statements as it currently is
               not using derivative instruments.

(2)            ENTRE LOMAS JOINT VENTURE

               The Company owns a 23 percent direct interest in the Entre Lomas
               joint venture. It also owns a 24.6 percent indirect interest by
               virtue of its 33.68 percent stock ownership in Petrolera Perez
               Companc S.A., the operator of the joint venture, which owns 73.15
               percent of the joint venture. Consequently, the Company's
               combined direct and indirect interests in the Entre Lomas joint
               venture total 47.6 percent. The joint venture is engaged in the
               exploration, development and production of oil and gas in the
               Entre Lomas concession located in the provinces of Rio Negro and
               Neuquen in southern Argentina.

               The Company's pro-rata share of the assets, liabilities, revenues
               and expenses of the Entre Lomas joint venture and Petrolera Perez
               Companc S.A. are reflected in the Company's Consolidated
               Financial Statements using proportional consolidation.


                                       29
<PAGE>   30

                       APCO ARGENTINA INC. AND SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued


(3)            CASH EQUIVALENTS

               Cash equivalents are defined by the Company as short-term
               investments with original maturities of three months or less.
               Amounts are stated in thousands of dollars.

<TABLE>
<CAPTION>

                                                                                        Principal
                                                                             ---------------------------------
                                                                                  1999                1998
                                                                             -------------       -------------

<S>                                                                            <C>                  <C>
               Short-term investments:

                  Eurodollar term deposits with interest ranging from 4.875 -
                     5.656% in 1999 and 4.719 - 4.875% in 1998, maturing in
                     January - March 2000 and January and
                     February 1999, respectively.                              $   8,490            $   9,262

                  Argentine time deposits                                          4,676                4,066
                                                                               ---------            ---------

                                                                               $  13,166            $  13,328
                                                                               =========            =========
</TABLE>

               The carrying amount reported in the balance sheet for short-term
               investments is equivalent to fair value.


(4)            MAJOR CUSTOMERS

               Sales to customers with greater than ten percent of total sales
               consist of the following:

<TABLE>
<CAPTION>
                                                                              For the Years Ended December 31,
                                                                          ----------------------------------------
                                                                           1999             1998              1997
                                                                          ------           ------            -----

<S>                                                                        <C>              <C>               <C>
               Refineria San Lorenzo S.A.                                  30.1%            24.1%             54.3%
               Petrobras S.A.                                              21.3%            17.3%                 *
               Litoral S.A.                                                    *            13.8%             10.9%
               Shell C.A.P.S.A.                                            21.3%            16.7%             16.0%
               Camuzzi Gas Pampeana S.A.                                   16.3%                *                 *
</TABLE>

               * Less than 10 percent


                                       30
<PAGE>   31

                       APCO ARGENTINA INC. AND SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued


(5)            RELATED PARTY TRANSACTIONS

               The Company paid approximately $147,000, $164,000, and $166,000
               in 1999, 1998 and 1997, respectively, to Williams and affiliates
               for management services, overhead allocation, general and
               administrative expenses and purchases of materials and supplies.
               Accounts payable to Williams and affiliates outstanding at
               December 31, 1999 and December 31, 1998, were approximately
               $382,000 and $141,000, respectively.

(6)            CAYMAN ISLANDS AND UNITED STATES INCOME TAXES

               In 1979, the Company changed the jurisdiction of its
               incorporation from Delaware to the Cayman Islands. The Company's
               income since that date, to the extent that it is derived from
               sources outside the U.S., generally is not subject to U.S.
               Federal income taxes. Also, the Company has been granted an
               undertaking from the Cayman Islands government, expiring in 2019,
               to the effect that the Company will be exempt from tax
               liabilities resulting from tax laws enacted by the Cayman Islands
               government subsequent to 1979. The Cayman Islands currently has
               no applicable income tax or corporation tax and, consequently,
               the Company believes its earnings are not subject to U.S. income
               taxes or Cayman Islands income or corporation taxes.

(7)            ARGENTINE TAXES

               The Company recorded Argentine taxes as presented in the
               following table. Amounts are stated in thousands of dollars. The
               Company is not subject to taxes in any other jurisdiction.

<TABLE>
<CAPTION>
                                                                  1999                1998                 1997
                                                                 ------              ------               ------

<S>                                                             <C>                 <C>                  <C>
               Income taxes                                     $ 5,330             $ 2,089              $ 6,208
               Other taxes                                          598                 454                  827
                                                                -------             -------              -------

                                                                $ 5,928             $ 2,543              $ 7,035
                                                                =======             =======              =======
</TABLE>


               INCOME TAXES

               A tax reform enacted by the Argentine government in 1998, served
               to increase the corporate income tax rate from 33 percent to 35
               percent. The new rate went into effect in January, 1999
               retroactive to January 1, 1998.

               TAX DISPUTES

               In 1988, the Argentine government amended the Obligatory Savings
               Law requiring that all taxpayers deposit with the government,
               both in 1988 and 1989, amounts computed on the basis of prior
               year taxable incomes. It was the opinion of the Entre Lomas joint
               venture and its legal and tax counsels that it was exempted from
               these deposits due to the tax


                                       31
<PAGE>   32

                       APCO ARGENTINA INC. AND SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued


               exemption granted in the original Entre Lomas contract number
               12,507. As a result the deposits were not made.

               In August 1993, the Direccion General Impositiva ("DGI"), the
               Argentine taxing authority, made a claim against Petrolera for
               the delinquent deposits pertaining to the Entre Lomas operation,
               which including interest and indexation for inflation, amounted
               to $9.2 million. An appeal was filed by Petrolera in Argentine
               Federal Tax Court which ruled in favor of the DGI in April 1997.
               Petrolera appealed the ruling before Federal Appeals Court which
               in November 1998, ruled in favor of Petrolera. The DGI has now
               filed an appeal before the Supreme Court. Although the DGI can
               require that the amount in question be deposited, it has not done
               so pending the courts final ruling.

               As of the date of these Consolidated Financial Statements, the
               Supreme Court has not yet rendered its decision. Although there
               exists an unfavorable ruling in the court in a prior case
               regarding Obligatory Savings, the Petrolera case is different and
               there are arguments that support the Appellate Court's decision
               in favor of Petrolera and the joint venture. In the opinion of
               legal and tax counsel, the possibility that this claim will
               result in an unfavorable outcome for the joint venture is only
               reasonably possible. The Company has no reason to believe
               otherwise. Nevertheless, management does not believe the Company
               will incur a significant negative effect on its financial
               condition or results of operation in the event of an unfavorable
               ruling in excess of reserves previously provided by the joint
               venture and the Company.

               In February 1993, the Neuquen Tax Bureau demanded that Petrolera
               pay the Stamp Tax on Additional Clause No. 3, the third amendment
               to the original Entre Lomas contract number 12,507. Petrolera
               appealed this decision before the Tax Court of the province and
               lost. In March 1994, Petrolera deposited $1.6 million, the sum
               claimed, and subsequently filed a suit before the Neuquen
               Superior Court asking for full reimbursement.

               Should Petrolera not prevail in Superior Court, in the opinion of
               its management and legal counsel, it is entitled to seek
               reimbursement from YPF pursuant to terms of contract 12,507.
               Accordingly, the amount deposited was recorded as a receivable by
               Petrolera and the Company.


                                       32
<PAGE>   33

                       APCO ARGENTINA INC. AND SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued


(8)            OTHER LIABILITIES AND LONG-TERM LIABILITIES

               At December 31, 1999 and 1998, other current liabilities and
               long-term liabilities consisted of the following:

<TABLE>
<CAPTION>
                                                                                        1999             1998
                                                                                        ----             ----

<S>                                                                                    <C>               <C>
              Current liabilities other:
                 Retirement obligation - Petrolera                                     $ 1,189           $   -
                                                                                       =======           =======

              Long-term liabilities:
                 Accrued tax and other long-term obligations                           $ 2,633           $ 2,033
                 Retirement obligation - Petrolera                                       1,394             1,137
                                                                                       -------           -------

                                                                                       $ 4,027           $ 3,170
                                                                                       =======           =======
</TABLE>

(9)            ARGENTINE CURRENCY FLUCTUATIONS

               Argentina has in previous decades experienced cycles of acute
               inflation followed by extreme devaluation. However, inflation and
               devaluation have diminished since 1991 due to implementation of
               the convertibility law, privatization of public sector companies,
               deregulation and modifications in fiscal and monetary policy.

               In April of 1991, the convertibility law was implemented
               establishing an exchange rate of one Argentine peso to one U.S.
               dollar. The convertibility law requires that the country's
               monetary base be backed by an equivalent amount of international
               reserves, including U.S. dollars and gold. Essentially the policy
               guarantees an exchange rate of 1:1. No exchange gains or losses
               have been realized by the Company during the three years ended
               December 31, 1999 as the rate of exchange has remained 1 to 1.


                                       33
<PAGE>   34

                       APCO ARGENTINA INC. AND SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued


(10)           QUARTERLY FINANCIAL DATA (UNAUDITED)

<TABLE>
<CAPTION>
                                                                  First        Second       Third           Fourth
                                                                  Quarter      Quarter       Quarter        Quarter
                                                                  -------      -------       -------        -------
<S>                                                                <C>          <C>          <C>            <C>
               (Amounts in Thousands Except
                     Per Share Amounts)

               1999

               Revenues                                            $7,760       $9,548       $12,050        $11,378
               Costs and expenses                                   6,384        7,224         8,900          8,740
               Net income                                           1,376        2,324         3,150          2,638
               Net income per ordinary share                          .19          .31           .43            .36

               1998

               Revenues                                            $8,621       $8,200       $ 9,824        $ 7,460
               Costs and expenses                                   6,811        6,969         8,312          8,645
               Net income (loss)                                    1,810        1,231         1,512         (1,185)
               Net income (loss) per ordinary share                   .25          .16           .21           (.16)
</TABLE>

               The loss generated in the fourth quarter 1998 was the result of
               oil sales prices reaching their lowest level of the decade during
               the fourth quarter.


                                       34
<PAGE>   35


SUPPLEMENTAL OIL AND GAS INFORMATION

OIL AND GAS RESERVES (UNAUDITED)

The following tables summarize, for each of the years presented, changes in
quantities, and balances of net proved oil and gas reserves for all the
Company's interests in Argentina.

           Proved Oil, Condensate and
           Plant Products

<TABLE>
<CAPTION>
                                                                      (Millions of Barrels)
                                                               -------------------------------------
                                                                1999             1998           1997
                                                                ----             ----           ----

<S>                                                             <C>              <C>            <C>
           Beginning of year                                    20.6             33.2           34.7
           Revisions of previous estimates
               -Engineering revisions                           (0.7)            (1.9)           0.1
               -Due to oil price changes                         8.5             (9.7)             -
           Extensions and discoveries                            2.3              0.8            0.2
           Production                                           (1.7)            (1.8)          (1.8)
                                                               -----            -----          -----


           End of Year                                          29.0             20.6           33.2
                                                                ====             ====           ====

           Proved developed oil reserves                        20.0             15.5           23.7
                                                                ====             ====           ====
</TABLE>

           Natural Gas

<TABLE>
<CAPTION>
                                                                    (Billions of cubic feet)
                                                                ------------------------------------
                                                                1999             1998           1997
                                                                ----             ----           ----

<S>                                                             <C>              <C>            <C>
           Beginning of year                                    27.5             36.6           46.8
           Revisions of previous estimates                      38.9             (1.4)          (8.6)
           Extensions and discoveries                           12.4                -            6.1
           Production                                           (7.1)            (7.7)          (7.7)
                                                                ----            -----          -----


           End of Year                                          71.7             27.5           36.6
                                                                ====             ====           ====

           Proved developed gas reserves                        51.1             26.8           35.8
                                                                ====             ====           ====
</TABLE>

Extensions and discoveries in the table of proved oil reserves include additions
associated with Borde Mocho and extensions of existing fields. The increase in
natural gas reserves attributed to revisions of previous estimates is the result
of better than predicted performance of existing gas fields, and the elimination
of the gas lift system in the CB/PB field described under "Capital Spending" on
page 17. The increase in natural gas reserves attributed to extensions and
discoveries is the result of gas field extensions in the Entre Lomas concession
and new gas reserve additions in the San Pedrito field in the Acambuco
concession.

There were no estimates of total proved net oil or gas reserves filed with any
other United States Federal authority or agency during 1999.


                                       35
<PAGE>   36

SUPPLEMENTAL OIL AND GAS INFORMATION

STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS (UNAUDITED)

The following table summarizes as of December 31, for each of the years
presented, the standardized measure of discounted future net cash flows from
proved oil and gas reserves that could be produced from all of the concessions
in which the Company holds interests in Argentina.


<TABLE>
<CAPTION>
                                                                            (Millions of U.S. Dollars)
                                                                       -----------------------------------
                                                                        1999            1998          1997
                                                                        ----            ----        ------


<S>                                                                   <C>             <C>           <C>
        Future revenues (1 and 2)                                     $  813          $  250        $  619
                                                                      ------          ------        ------
        Future expenditures (3)                                          360             199           378
                                                                      ------          ------        ------
                                                                         453              51           241

        Argentine taxes (4)                                              149              11            67
                                                                      ------          ------        ------

        Future net cash flows                                            304              40           174

        Effect of discounting 10%                                        161              13            90
                                                                      ------          ------        ------

        Standardized measure of
        discounted future net cash flows                              $  143          $   27        $   84
                                                                      ======          ======        ======
</TABLE>


(1)     Estimates are made of quantities and timing of future production of oil
        and gas reserves.

(2)     Estimates of gross revenues from sales are made using prices in effect
        at December 31 for each year presented. The year end per barrel oil
        price for 1999 was $24.98, as compared with $10.09 and $17.20 for 1998
        and 1997, respectively. Gas prices for all years are based on gas sales
        contracts in effect during the respective years.

(3)     Estimated production, transportation, marketing and development costs
        are based on the current cost of similar services and include all future
        capital expenditures.

(4)     Estimated taxes consider all taxes to which the Company is subject in
        Argentina.

(5)     Conversion  to U.S.  dollars is made  utilizing the rate of exchange at
        December 31  for each of the years presented.

DISCOUNTED FUTURE NET CASH FLOWS PRESENTED HEREIN MAY NOT BE RELIABLE DUE TO THE
IMPRECISION OF ESTIMATING REMAINING RECOVERABLE RESERVES. ESTIMATES OF OIL AND
GAS RESERVES AND RATES OF FUTURE PRODUCTION ARE INHERENTLY IMPRECISE AND CHANGE
OVER TIME AS NEW INFORMATION BECOMES AVAILABLE. AS A RESULT, SUBSEQUENT
REVISIONS OF THE QUANTITY AND VALUATION OF PROVED RESERVES MAY BE SIGNIFICANT.


                                       36
<PAGE>   37

SUPPLEMENTAL OIL AND GAS INFORMATION

CHANGES IN STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS FROM PROVED
OIL AND GAS RESERVES (UNAUDITED)

The following analysis summarizes for each of the years presented the factors
that caused the increases (decreases) in the amount of standardized measure
attributable to the estimate of the Company's proved oil and gas reserves.

<TABLE>
<CAPTION>
                                                                           (Millions of U.S. Dollars)
                                                                      -----------------------------------
                                                                       1999          1998            1997
                                                                       ----          ----            ----

<S>                                                                   <C>          <C>             <C>
       Prices and costs:
           Net changes in prices and
              production costs                                        $    88      $   (82)        $  (129)

       Quantities:
           Revenues, net of
              production costs                                            (32)         (18)            (15)
           Additions and revisions
              of previous estimates - net                                 129          (50)              1

       Other:
           Changes in estimated
              future development costs                                    (12)          (4)              6
           Accretion of discount                                            3           12              24
           Net changes in Argentine
              taxes                                                       (66)          42              40
           Timing of future
              production and other                                          6           43              (8)
                                                                      -------      -------         -------

       Net increase (decrease) in
              standardized measure                                    $   116      $   (57)        $   (81)
                                                                      =======      =======         =======
</TABLE>


Proved oil and gas reserves are the estimated quantities of crude oil, natural
gas, and natural gas liquids which geological and engineering data demonstrate
with reasonable certainty to be recoverable in future years from known
reservoirs under existing economic and operating conditions. Proved developed
oil and gas reserves are reserves that can be expected to be recovered through
existing wells with existing equipment and operating methods. Proved undeveloped
oil and gas reserves are reserves that are expected to be recovered from new
wells on undrilled acreage, or from existing wells where a relatively major
expenditure is required for recompletion.


                                       37
<PAGE>   38


SUPPLEMENTAL OIL AND GAS INFORMATION - CONT.

SALES AND PRICE STATISTICS (UNAUDITED)

The following table shows total sales of crude oil and condensate and natural
gas and average sales prices and production costs for the last three years.

<TABLE>
<CAPTION>
                                                                      1999                1998             1997
                                                                   ----------          ---------        ----------

<S>                                                           <C>                 <C>              <C>
Total Sales-Net to Company

Crude Oil and Condensate (bbls)                                     1,667,717          1,732,261         1,811,956
Gas (mcf)                                                           7,086,576          7,734,396         7,733,392
LPG (tons)                                                              6,495              6,192             6,607

Average Sales Prices (in U.S. Dollars)

Oil (per bbl)                                                 $         17.75     $        12.71   $         19.52
Gas (per mcf)                                                            1.35               1.33              1.34
LPG (per ton)                                                          170.10             168.78            198.72

Average Production Costs (in U.S. Dollars)

Oil (per bbl)                                                 $          8.26     $         9.09   $          8.27
Gas (per mcf)                                                             .21                .23               .21
LPG (per ton)                                                           74.75              86.55             89.70
</TABLE>


Volumes presented in the above table represent those sold to customers and have
not been reduced by the 12 percent provincial royalty, which is paid separately
and is accounted for as an expense by the Company. In calculating royalty
payments, the Argentine producers are entitled to deduct gathering, storage,
treating and compression costs.

Average production cost is calculated by taking into consideration all costs of
operation, including the costs of remedial well workovers and depreciation of
property and equipment.



                                       38
<PAGE>   39

SUPPLEMENTAL OIL AND GAS INFORMATION - CONT.

COSTS INCURRED IN ACQUISITIONS, EXPLORATION, AND DEVELOPMENT

The following table details total investments for acquisitions, exploration, and
development made by the Company during the current and two previous years.


<TABLE>
<CAPTION>
                                                                   (Millions of U.S. Dollars)
                                                          --------------------------------------------
                                                            1999            1998              1997
                                                            ----            ----              ----

<S>                                                        <C>               <C>               <C>
               Property Acquisitions                       $  -              $  -              $ 1
               Exploration                                    1                 2                -
               Development                                    8                13               11
               Workovers                                      1                 2                3
                                                           ----              ----              ---


                 Total                                     $ 10              $ 17              $15
                                                           ====              ====              ===
</TABLE>

DRILLING ACTIVITY

During 1999, the Company participated in the drilling of 15 gross, and 6 net
wells. In 1998, the Company participated in the drilling of 18 gross, and 8 net
wells, and in 1997, the Company participated in the drilling of 11 gross and 5
net wells. Of the 44 gross, and 19 net wells drilled over the three year period,
all wells were development, except two wells drilled in Acambuco, in which the
Company has a 1.5 percent participation. All wells drilled over the three year
period were productive except the Cerro Tuyunti x-1 well in Acambuco, the status
of which is still undetermined.

WELL COUNT AND ACREAGE (UNAUDITED)

The total gross and net well count from all acreage in which the Company has an
interest for the years ended December 31, 1999 and 1998, are as follows:

<TABLE>
<CAPTION>
                                                                    1999                  1998
                                                             -----------------       --------------

                                                              Gross        Net       Gross      Net
                                                              -----        ---       -----      ---

<S>                                                             <C>        <C>         <C>      <C>
               Oil                                              285        133         299      141
               Gas                                               21          9          19        9
               Abandoned and Inactive                            72         28          50       17
               Injection                                        113         54         111       53
                                                                ---        ---         ---      ---

                 Total                                          491        224         479      220
                                                                ===        ===         ===      ===
</TABLE>

The Company currently holds interest in three concessions with a total surface
area of 542,000 acres, 132,586 acres net to the Company. Gross and net developed
acres held by the Company total 39,108 acres, and 17,674 acres, respectively.
Gross and net undeveloped acres held by the Company total 502,892 acres, and
114,912 acres, respectively.


                                       39
<PAGE>   40
SUPPLEMENTAL OIL AND GAS INFORMATION - CONT.

CAPITALIZED COSTS RELATED TO OIL AND GAS PRODUCING ACTIVITIES

<TABLE>
<CAPTION>
                            (Thousands of U.S. Dollars)
                            ---------------------------
                                  1999        1998
                            -------------  ------------
<S>                             <C>         <C>
Unproved                        $    892    $    892
Proved oil and gas properties     86,516      78,265
Accumulated depreciation,
  depletion and amortization     (43,312)    (38,079)
                                --------    --------

Net capitalized costs           $ 44,096    $ 41,078
                                ========    ========
</TABLE>


ITEM 9.   CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS

          None.




                                       40
<PAGE>   41

                                    PART III


ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

(a)      IDENTIFICATION OF DIRECTORS

<TABLE>
<CAPTION>
                                                                                                   Director's
                                                                                                    Term of
                                                                                     Director         Office
                    Name             Age                 Position                     Since          Expires
               -----------------     ---    ----------------------------------       --------       ----------
<S>                                  <C>    <C>                                     <C>             <C>
               J. C. Bumgarner        57    Chairman of the Board and                  1994            2000
                                              Chief Executive Officer

               J. H.  Williams        81    Director                                   1992            2001

               T. Bueno               48    Director, Chief Accounting Officer         1998            2002
                                              and General Manager

               R. J. LaFortune        73    Director                                   1998            2002
</TABLE>

(b)      IDENTIFICATION OF EXECUTIVE OFFICERS

                  Executive officers of the Company are elected by the Board of
         Directors and hold office until relieved of such office by action of
         the Board of Directors.

<TABLE>
<CAPTION>
                                                                                                     Officer
                     Name                   Age               Position                                Since
               ----------------------       ---      -----------------------------------            --------
<S>                                         <C>      <C>                                            <C>
               John C. Bumgarner             57      Chairman of the Board and                          1996
                                                       Chief Executive Officer

               J. D. McCarthy                57      Vice President and                                 1991
                                                       Chief Financial Officer

               Thomas Bueno                  48      Controller, Chief Accounting                       1991
                                                       Officer and General
                                                       Manager
</TABLE>

                  Mr. Bueno serves as General Manager over the Company's
         operations in Argentina.

(c)      IDENTIFICATION OF CERTAIN SIGNIFICANT EMPLOYEES

                  None.



                                       41
<PAGE>   42

(d)      FAMILY RELATIONSHIPS

         There are no family relationships between any director or executive
         officer and any other director or executive officer in the Company.

(e)      BUSINESS EXPERIENCE

         Mr. Bumgarner is Senior Vice President Corporate Development and
         Planning of Williams and President of Williams International Company.
         He has held various officer level positions with Williams since 1977.

         Mr. Williams is engaged in personal investments. He was Chairman of the
         Board and Chief Executive Officer of Williams prior to retiring in
         1978. Mr. Williams is also a director of General Cable Corporation and
         Unit Corporation.

         Mr. Bueno has been employed by Williams since 1984 and has held various
         positions with the Company since 1985.

         J. D. McCarthy is Senior Vice President of Finance of Williams. He was
         previously Vice President and Treasurer of Williams from 1987 through
         1991.

         Mr. LaFortune is engaged in personal investments. He is a Director of
         The Williams Companies, Inc.

(f)      INVOLVEMENT IN CERTAIN LEGAL PROCEEDINGS

         None.


ITEM 11. EXECUTIVE COMPENSATION

(a)      CASH COMPENSATION

         The Company has not paid its present executive officers any cash
         compensation or bonuses.

(b)      COMPENSATION PURSUANT TO PLANS

         None.

(c)      OTHER COMPENSATION

         None.



                                       42
<PAGE>   43

(d)      COMPENSATION OF DIRECTORS

         Directors who are employees of Williams receive no additional
         compensation for service on the Board of Directors. Directors who are
         not employees of Williams receive an annual retainer of $8,000 and an
         additional fee for attending Board meetings of $500 per meeting.

(e)      TERMINATION OF EMPLOYMENT AND CHANGE OF CONTROL ARRANGEMENT

         None.


ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

(a)      SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AT DECEMBER 31, 1999


<TABLE>
<CAPTION>
                                                                                        Amount and
                                                                                        Nature of         Percent
                                              Name and Address of                       Beneficial           of
                Title of Class                   Beneficial Owner                       Ownership          Class
                --------------                   ----------------                       ---------          -----
               <S>                      <C>                                             <C>               <C>
               Ordinary Shares          The Williams Companies, Inc.                    5,075,398         68.96
               $.01 Par Value           One Williams Center
                                        Tulsa, Oklahoma  74172

               Ordinary Shares          Lehman Brothers Holdings Inc.                     437,062           6.0
               $.01 Par Value           3 World Financial Center, 24th Floor
                                        New York, NY 10285
</TABLE>

(b)      SECURITY OWNERSHIP OF MANAGEMENT AT DECEMBER 31, 1999

         Each of the directors of the Company beneficially owns ten shares of
         the Company's ordinary shares, $.01 par value, as director's qualifying
         shares.

(c)      CHANGES IN CONTROL

         None.


ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

         Certain relationships and related-party transactions are disclosed
         elsewhere herein in Notes 1 and 5 to the Notes to Consolidated
         Financial Statements.



                                       43
<PAGE>   44

                                     PART IV


ITEM 14.       EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(a)            FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULES

               Financial Statements filed in this report are set forth in the
               Index to Consolidated Financial Statements under Item 8. All
               schedules have been omitted as the required information has been
               included in the consolidated financial statements and notes
               thereto, or because the schedules are not applicable or required.

(b)            REPORTS ON FORM 8-K

               None.

(c)            EXHIBITS REQUIRED BY ITEM 601 OF REGULATION S-K

               Exhibit
               Number
               -------

               *(3)      - Memorandum of Association of Apco Argentina Inc. as
                           amended August 20, 1980, as filed with Form 10-K of
                           the Company for the fiscal year ended on December 31,
                           1980, Commission File No. 0-8933 dated April 30,
                           1981.

               *(3)      - Articles of Association of Apco Argentina Inc. as
                           filed with Form S-14 (Registration No. 2-6354), dated
                           March 16, 1979.

               *(10)     - Agreement dated April 23, 1981, among the Company and
                           Bridas S.A.P.I.C., with respect to the Acambuco
                           project, Salta province, Argentina, as filed with
                           Form 10-K, No. 0-8933, dated April 14, 1982.

               *(10)     - Agreement dated March 13, 1968, between Perez Companc
                           and YPF for the Exploration, Exploitation and
                           Development of the "Entre Lomas" area, Contract
                           Number 12,507 as filed with Form S-1, Registration
                           No. 2-62187 dated September 26, 1978.

               *(10)     - Translation dated November 18, 1970, of agreement
                           dated March 13, 1968, between Perez Companc and YPF
                           as filed with Form S-1, Registration No. 2-62187
                           dated September 26, 1978.

               *(10)     - Joint Venture Agreement dated April 1, 1968, among
                           Apco Oil Corporation, Perez Companc and Petrolera as
                           filed with Form S-1, Registration No. 2-62187 dated
                           September 26, 1978.



                                       44

<PAGE>   45

               *(10)     - Joint Venture Agreement dated February 29, 1972,
                           among the Company, Perez Companc and Petrolera as
                           filed with Form S-1, Registration No. 2-62187 dated
                           September 26, 1978.

               *(10)     - Joint Venture Agreement dated March 23, 1977, among
                           the Company, Perez Companc and Petrolera as filed
                           with Form S-1, Registration No. 2-62187 dated
                           September 26, 1978.

               *(10)     - Contract dated December 1977 amending the March 13,
                           1968 Agreement between Perez Companc and YPF as filed
                           with Form S-1, Registration No. 2-62187 dated
                           September 26, 1978.

               *(10)     - Memorandum of Agreement dated August 16, 1979, among
                           the Company, Perez Companc and Petrolera as filed
                           with Form 10-K, No. 0-8933, dated March 28, 1980.

               *(10)     - Agreement dated December 7, 1983, between Petrolera
                           and YPF regarding the delivery of propane and butane
                           from the Entre Lomas area, as filed with Form 10-K,
                           No. 0-8933, dated April 12, 1983.

               *(10)     - CONTRACT FOR THE EXPLORATION, EXPLOITATION AND
                           DEVELOPMENT OF THE "ENTRE LOMAS" AREA, dated July 8,
                           1982 between Yacimientos Petroliferos Fiscales
                           Sociedad Del Estado and Petrolera Perez Companc, Inc.
                           relating to the extension of Contract No. 12,507, as
                           filed with Form 10-K, No. 0-8933, dated April 12,
                           1983.

               *(10)     - ADDITIONAL CLAUSE NUMBER 3 dated December 18, 1985,
                           to the agreement between Perez Companc and YPF
                           covering the Entre Lomas area dated March 13, 1968
                           and attached translation as filed with Form 10-K, No.
                           0-8933, dated April 11, 1988.

               *(10)     - Agreement between the Joint Committee created by the
                           Ministry of Public Works and Services and the
                           Ministry of Energy, YPF and Petrolera Perez Companc
                           S.A. dated December 26, 1990, constituting the
                           conversion to concession and deregulation of the
                           original Entre Lomas contract number 12,507.

                (24)     - Power of attorney.

                (27)     - Financial data schedule.

               *         Exhibits so marked have heretofore been filed with the
                         Securities and Exchange Commission as part of the
                         filing indicated and are incorporated herein by
                         reference.


                                       45
<PAGE>   46

                                    SIGNATURE


Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, the registrant has duly caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized.


                                                APCO ARGENTINA INC.
                                                   (Registrant)


Dated: March 20, 2000                          By: /s/ Thomas Bueno
                                                  -----------------------
                                                       Thomas Bueno
                                                     Attorney-in-Fact



Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following persons on behalf of the registrant and
in the capacities and on the date indicated.


/s/ *John C. Bumgarner                                   March 20, 2000
- -------------------------------------------------
John C. Bumgarner, Chairman of the Board
     and Chief Executive Officer


/s/ *Jack D. McCarthy                                    March 20, 2000
- -------------------------------------------------
Jack D. McCarthy, Vice President and
     Chief Financial Officer


/s/ *Thomas Bueno                                        March 20, 2000
- -------------------------------------------------
Thomas Bueno, Director, Controller, Chief
     Accounting Officer, and General Manager


/s/ *John H. Williams                                    March 20, 2000
- -------------------------------------------------
John H. Williams, Director


/s/ *Robert J. LaFortune                                 March 20, 2000
- -------------------------------------------------
Robert J. LaFortune, Director


*By: /s/ Thomas Bueno                                    March 20, 2000
     --------------------------------------------
     Thomas Bueno, Attorney-in-Fact



                                       46
<PAGE>   47
                               INDEX TO EXHIBITS


<TABLE>
<CAPTION>
               Exhibit
               Number         Description
               -------        ------------
               <S>       <C>
               *(3)      - Memorandum of Association of Apco Argentina Inc. as
                           amended August 20, 1980, as filed with Form 10-K of
                           the Company for the fiscal year ended on December 31,
                           1980, Commission File No. 0-8933 dated April 30,
                           1981.

               *(3)      - Articles of Association of Apco Argentina Inc. as
                           filed with Form S-14 (Registration No. 2-6354), dated
                           March 16, 1979.

               *(10)     - Agreement dated April 23, 1981, among the Company and
                           Bridas S.A.P.I.C., with respect to the Acambuco
                           project, Salta province, Argentina, as filed with
                           Form 10-K, No. 0-8933, dated April 14, 1982.

               *(10)     - Agreement dated March 13, 1968, between Perez Companc
                           and YPF for the Exploration, Exploitation and
                           Development of the "Entre Lomas" area, Contract
                           Number 12,507 as filed with Form S-1, Registration
                           No. 2-62187 dated September 26, 1978.

               *(10)     - Translation dated November 18, 1970, of agreement
                           dated March 13, 1968, between Perez Companc and YPF
                           as filed with Form S-1, Registration No. 2-62187
                           dated September 26, 1978.

               *(10)     - Joint Venture Agreement dated April 1, 1968, among
                           Apco Oil Corporation, Perez Companc and Petrolera as
                           filed with Form S-1, Registration No. 2-62187 dated
                           September 26, 1978.

               *(10)     - Joint Venture Agreement dated February 29, 1972,
                           among the Company, Perez Companc and Petrolera as
                           filed with Form S-1, Registration No. 2-62187 dated
                           September 26, 1978.

               *(10)     - Joint Venture Agreement dated March 23, 1977, among
                           the Company, Perez Companc and Petrolera as filed
                           with Form S-1, Registration No. 2-62187 dated
                           September 26, 1978.

               *(10)     - Contract dated December 1977 amending the March 13,
                           1968 Agreement between Perez Companc and YPF as filed
                           with Form S-1, Registration No. 2-62187 dated
                           September 26, 1978.

               *(10)     - Memorandum of Agreement dated August 16, 1979, among
                           the Company, Perez Companc and Petrolera as filed
                           with Form 10-K, No. 0-8933, dated March 28, 1980.

               *(10)     - Agreement dated December 7, 1983, between Petrolera
                           and YPF regarding the delivery of propane and butane
                           from the Entre Lomas area, as filed with Form 10-K,
                           No. 0-8933, dated April 12, 1983.

               *(10)     - CONTRACT FOR THE EXPLORATION, EXPLOITATION AND
                           DEVELOPMENT OF THE "ENTRE LOMAS" AREA, dated July 8,
                           1982 between Yacimientos Petroliferos Fiscales
                           Sociedad Del Estado and Petrolera Perez Companc, Inc.
                           relating to the extension of Contract No. 12,507, as
                           filed with Form 10-K, No. 0-8933, dated April 12,
                           1983.

               *(10)     - ADDITIONAL CLAUSE NUMBER 3 dated December 18, 1985,
                           to the agreement between Perez Companc and YPF
                           covering the Entre Lomas area dated March 13, 1968
                           and attached translation as filed with Form 10-K, No.
                           0-8933, dated April 11, 1988.

               *(10)     - Agreement between the Joint Committee created by the
                           Ministry of Public Works and Services and the
                           Ministry of Energy, YPF and Petrolera Perez Companc
                           S.A. dated December 26, 1990, constituting the
                           conversion to concession and deregulation of the
                           original Entre Lomas contract number 12,507.

                (24)     -  Power of attorney.

                (27)     -  Financial data schedule.
</TABLE>

               *         Exhibits so marked have heretofore been filed with the
                         Securities and Exchange Commission as part of the
                         filing indicated and are incorporated herein by
                         reference.

<PAGE>   1


                                                                      Exhibit 24

                              APCO ARGENTINA, INC.

                                POWER OF ATTORNEY

         KNOW ALL MEN BY THESE PRESENTS that each of the undersigned
individuals, in their capacity as a director or officer, or both, as hereinafter
set forth below their signature, of APCO ARGENTINA, INC., a Cayman Islands
corporation ("Apco"), does hereby constitute and appoint THOMAS BUENO their true
and lawful attorney and in their name and in their capacity as a director or
officer, or both, of Apco, as hereinafter set forth below their signature, to
sign Apco's Annual Report to the Securities and Exchange Commission on Form 10-K
for the fiscal year ended December 31, 1999, and any and all amendments thereto
or all instruments necessary or incidental in connection therewith; and

         THAT the undersigned Apco does hereby constitute and appoint THOMAS
BUENO its true and lawful attorney for it and in its name and on its behalf to
sign said Form 10-K and any and all amendments thereto and any and all
instruments necessary or incidental in connection therewith.

         Said attorney shall have full power of substitution and resubstitution,
and said attorney or any substitute appointed by him hereunder shall have full
power and authority to do and perform in the name and on behalf of each of the
undersigned, in any and all capacities, every act whatsoever requisite or
necessary to be done in the premises, as fully to all intents and purposes as
each of the undersigned might or could do in person, the undersigned hereby
ratifying and approving the acts of said attorney or of any such substitute
pursuant hereto.

         IN WITNESS WHEREOF, the undersigned have executed this instrument, all
as of the 14th day of January, 2000.


     /s/ John C. Bumgarner, Jr.                   /s/ Jack D. McCarthy
- ---------------------------------------  ---------------------------------------
        John C. Bumgarner, Jr.                     Jack D. McCarthy
      President, Chief Executive                Chief Financial Officer
           Officer, and Director             (Principal Financial Officer)
     (Principal Executive Officer)


                                /s/ Thomas Bueno
                     ---------------------------------------
                                  Thomas Bueno
                             Controller and Director
                         (Principal Accounting Officer)

<PAGE>   2




        /s/ Robert J. LaFortune                  /s/ John H. Williams
- -------------------------------------   ---------------------------------------
         Robert J. LaFortune                       John H. Williams
              Director                                 Director



                                        APCO ARGENTINA, INC.



                                        By /s/ John C. Bumgarner, Jr.
                                          ------------------------------
                                             John C. Bumgarner, Jr.
                                                    President

ATTEST:



         /s/ Shawna L. Gehres
- -------------------------------------
           Shawna L. Gehres
               Secretary


<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                          14,207
<SECURITIES>                                         0
<RECEIVABLES>                                    7,967
<ALLOWANCES>                                         0
<INVENTORY>                                        892
<CURRENT-ASSETS>                                23,527
<PP&E>                                          87,724
<DEPRECIATION>                                  43,569
<TOTAL-ASSETS>                                  71,001
<CURRENT-LIABILITIES>                           11,512
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            74
<OTHER-SE>                                      55,031
<TOTAL-LIABILITY-AND-EQUITY>                    71,001
<SALES>                                         40,252
<TOTAL-REVENUES>                                40,736
<CGS>                                                0
<TOTAL-COSTS>                                   24,541
<OTHER-EXPENSES>                                 1,377
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 14,818
<INCOME-TAX>                                     5,330
<INCOME-CONTINUING>                              9,488
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     9,488
<EPS-BASIC>                                       1.29
<EPS-DILUTED>                                     1.29


</TABLE>


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