Golfo San Jorge Basin

Golfo San Jorge Basin
Cuenca del Golfo San Jorge
Oil well near the port city of Comodoro Rivadavia
Map showing the location of Golfo San Jorge Basin
Location of the basin in Argentina
The Golfo San Jorge Basin is located between the North Patagonian and Deseado Massifs
Coordinates 45°00′S 67°50′W / 45.000°S 67.833°W / -45.000; -67.833
Etymology San Jorge Gulf
Location Southern South America
Region Patagonia
Country  Argentina
State(s) Chubut, Santa Cruz
Cities Comodoro Rivadavia
Characteristics
On/Offshore Both
Boundaries North Patagonian Massif, Deseado Massif, Andes
Part of Southern Atlantic rift basins
Area 170,000 km2 (66,000 sq mi)
Hydrology
Sea(s) South Atlantic
River(s) Chico River
Lake(s) Lake Musters and Lake Colhué Huapí
Geology
Basin type Rift
Plate South American
Orogeny Opening of the South Atlantic
Age Early Jurassic-Pleistocene
Stratigraphy Stratigraphy
Field(s) Cañadón León, Cerro Dragón, Diadema, El Tordillo
Photograph of the first oil well in Comodoro Rivadavia

The Golfo San Jorge Basin (Spanish: Cuenca del Golfo San Jorge) is a hydrocarbon-rich sedimentary basin located in eastern Patagonia, Argentina. The basin covers the entire San Jorge Gulf and an inland area west of it, having one half located in Santa Cruz Province and the other in Chubut Province. The northern boundary of the basin is the North Patagonian Massif while the Deseado Massif forms the southern boundary of the basin. The basin has largely developed under condition of extensional tectonics, including rifting.[1]

At the center of the basin accumulated sediments reach more than 8,000 metres (26,000 ft) of thickness. Oil was first discovered in 1907 and over the years it has become the second most productive hydrocarbon basin in Argentina after Neuquén Basin.[1]

Stratigraphy

The stratigraphy of the Golfo San Jorge Basin covers the following units:[1][2]

GroupFormationAge
bold is SALMA type		Tectonic regimeDepositional environmentThickness
(m)		Petroleum geology
Tehuelche ShinglePleistoceneGlacio-fluvial40
Río MayoMayoan
Santa CruzSantacrucianFluvio-deltaic200
PatagoniaShallow marine280
Sarmiento
 Colhué Huapí Mb.
Chenque		ColhuehuapianFluvio-lacustrine120
Deseadan
Tinguirirican
Río ChicoKoluel KaikeDivisaderanLacustrine42
Mustersan
Casamayor
Las Flores		CasamayoranFluvio-lacustrine44
Peñas ColoradasRiochicanFluvial42
Itaboraian
Las VioletasPeligran25
SalamancaPeligranShallow marine-deltaic-fluvial200RES
Tiupampan
Yacimiento El Trébol
Meseta Espinosa
Bajo Barreal
Laguna Palacios		Maastrichtian
Aptian		Late sagDeltaic
Fluvio-lacustrine		4000+RES
Cañadón Seco
Comodoro Rivadavia
Bajo Barreal		Alluvial-fluvial-lacustrineRES
Mina El Carmen
Castillo		Fluvio-lacustrineRES
Pozo D-129
Matasiete		Early sag1500+SR, RES
Pozo Cerro GuadalNeocomianLate riftFluvio-lacustrine560
Pozo Anticlinal Aguada BanderaLacustrine1700+SR
Bahía Laura
Lonco Trapial		Late JurassicEarly riftVolcaniclastic1300+
Early JurassicPre-riftShallow marine700+
BasementPaleozoic

See also

References

  1. 1 2 3 Sylwan, Caudio A. (2001). "Geology of the Golfo San Jorge Basin, Argentina". Journal of Iberian Geology. 27: 123–157. Retrieved 4 December 2015.
  2. ↑ Raigemborn et al., 2010, p.243

Bibliography

Further reading

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