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This digital geologicprovincemap ofthe continent of South Americawas produced fortheWorld Energy Project ofthe U.S. Geological Survey. The purposeof this projectis to providea quantitativeassessement ofthe undiscovered recoverableoil and gasresources in priority provinces oft heworld. Fort his project theworld was subdividedinto eight regions that generally correspond to the economic regions defined by theU.S.Department ofState and to the international market regions recognized by the U.S.Department ofEnergy. South and Central Americaare included in Region 6 forthe WorldEnergy Project (Klett and others, 1997).

Thepurposeofthis map is to illustratethegeologicprovinces ofSouth Americaand thedistribution ofoi l and gas fields. Using thegeologic units and many other sources of data, theentire continent was subdivided into geologicprovinces (Committeeon theWorldGeologic Map, 1964; Bigarella, 1973; Urien and Zambrano,1973; Travis and others, 1975;Mordojovich, 1981; Ojeda, 1982; Jordan and Allmendinger, 1986; Yrigoven, 1991; Kingston,1994; McGettigan and Hunt, 1996; Audemard and Lugo, 1997). Theoffshore boundary oftheprovinces differs depending upon thelocation. The offshoreboundary ofprovinces alongthe northern and western tectonically active margins was placed at an isobath of 2000 m,whereas the offshore boundary of provinces along the eastern passive margin was placed atapproximately the3800 m isobath. A total of106 geologicprovinces were defined in SouthAmerica. Names formost ofthe provinces reflect common usagein theliterat ure. Theprovinces arebeing further subdivided into petroleum systems and assessment units thatform thebasis fortheresourceassessment.

Oil and gas data weredigitally allocated to thegeologicprovinces, and these provinceswere then ranked according to known oil and gas resources to provide a prioritization forthe resource assessment (Klett and others, 1997). Fort his assessment thepriority provincesin South Americaare Campos Basin, Neuquen Basin, San JorgeBasin, Magellenes Basin,Santa CruzTarija, PutamayoOrientMaranon, Llanos Basin, Magdelena Basins, MaracaiboBasin, East Venezeula Basin, and the Tobago Trough.

The oil and gas data were obtained from Petroconsultants (1996), and theoil and gas fieldcenterpoints are used on this map with permission ofPet roconsultants International DataCorporation.

Political boundaries shown on this map weretaken, with permission, from theESRI ArcWorld1:3 million scale digital world coverage and aredisplayed forgeneral referenceonly.

This map is preliminary and has not been reviewed forconformity with U.S. GeologicalSurvey editorial standards orwith theInternati onal StratigraphicCode.

Asmus, H.E., and Ponte, C.F., 1973, TheBrazi lian marginal basins, in Nairn, A.E.M.,and Stehli, F.G., eds., TheOcean Basins and Margins, v. 1, TheSouth Atlantic:Plenum Press, New York, p. 87133.

Audemard, F., and Lugo, J., 1997, Petroleum geology ofVenezuela: American AssociationofPet roleum Geologists Short CourseNotes, Dallas, Texas, unpaginated.

Bigarella, J.J., 1973, Geology oft heAmazonas and Parnaiba basins, in Nairn, A.E.M.,and Stehli, F.G., eds., TheOcean Basins and Margins, v. 1, TheSouth Atlantic:Plenum Press, New York, p. 2586.

Committee on theWorld GeologicMap, 1964, GeologicMap ofSouth America: Rio deJaneiro, Brazil, 2 sheets, 1:5,000,000 scale.

Environmental Systems Research Institute, Inc., 1992, ArcWorld 1:3 million digitaldatabase, ESRI, Redlands, California.

Jordan, T.E., and Allmendinger, R.W., 1986, TheSierras Pampaneas of Argentina; amodern analoqueof Rocky Mountain foreland deformation: American Journal ofS cience,v. 286, p. 737764.

Kingston, J., 1994, Undiscovered petroleum ofsouthern South America: U.S. GeologicalSurvey OpenFileReport 94559, 443 p.

Klett, T.R., Ahlbrandt, T.S. Schmoker, J.W., and Dolton, G.L., 1997, Ranking ofthe worldsoil and gas provinces by known petroleum volumes: U.S. Geol ogical Survey OpenFileReport 97463, one CDROM.

McGettigan, C.K., and Hunt, D.G., 1996, Columbia continues to yield majoroil, gasdiscoveries: Oil and Gas Journal, July 15, 1996, p. 4045.

Mordojovich, C., 1981, Sedimentary basins ofthe Chilean Pacific offshore, in EnergyResources of thePacificRegion: American Association of Petroleum Geologists Studiesin Geology, v. 12, p. 6368.

Ojeda, H.A.O., 1982, Structural framework, stratigraphy, and evolution ofB razilian marginalbasins: American Association of Petroleum Geologists Bulleti n, v. 66, no. 6, p. 732749.

Petroconsultants, 1996, Petroconsultants WorldwideOil and Gas Field Database1996:Petroconsultants International DataCorporati on, Geneva, Switzerland.

Travis, R.B., Gonzales, G., and Pardo, A., 1975, Hydrocarbon potential ofcoastal basi ns of Peru: American Association of Petroleum Geologists Memoir No. 25, p. 331338.

Urien, C.M., and Zambrano, J.J., 1973, Thegeol ogy oft hebasi ns ofthe Argentine continentalmargin and Malvinas Plateau, in Nairn, A.E.M., and Stehli, F.G., eds., The Ocean Basinsand Margins, v. 1, The South Atlantic: Pl enum Press, New York, p. 135169.

Yrigoven, M.R., 1991, Energy resources map ofthe CircumPacificregion; southeast quadrant:U.S. Geological Survey CircumPacific Map Series, Map CP39, 2 sheets, 1:10,000,000scale.

EXPLANATION

Oil and gas fields

Province boundaries

Country boundaries

6000 Province number

Bipolar Oblique ProjectionUnits: MetersFalse Easting: 0, False Northing: 0

DEPARTMENT OF THE INTERIORGEOLOGICAL SURVEY

OPENFILE REPORT97470D

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