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Cuevas Leree, Antonio1, Rogelio Muñoz-Cisneros2, Pedro Silva-Saldivar2, Victor Hugo De la Rosa-R2, Esmer O. Rivas-R2, Jesus Gonzalez-O2, Ramiro Fernandez-Turner2
(1) Activo Regional de Exploracion, Pemex E&P, Poza Rica, Ver, Mexico
(2) Activo Integral Burgos, Pemex E&P, Reynosa, Tamps, Mexico

ABSTRACT: A New Upper Oligocene Oil Play in the Southern Burgos Basin, Mexico

The discovery of oil in a new play of Upper Oligocene shoreface sandstones has increased prospectivity of the Tertiary in the southern part of the Burgos Basin. This clastic succession was deposited by a deltaic system that had a sediment dispersion pattern not related to the Rio Grande Embayment but to uplifted terrains along the Sierra Madre Oriental Thrust Belt. Geochemical modeling indicates a Tithonian origin for the oil and the existence of a generation kitchen adjacent to the discoveries, implying migration of light oil (46° API) over a few kilometers. The listric faults that have contributed to the formation of traps have also been the main migration pathways connecting source rocks to traps.
The tested intervals are fine-grained sandstones with a gross thickness of 600 meters, lying at 2600 to 2900 m below sea level. Porosity and permeability are between 11 and 17% and 0.5 to 21 milidarcys, respectively. Sandstone resistivity typically varies from 2 to 10 ohm-m. These rocks produce at estimated rates of 4000 bopd and 9 MMscfd of gas. Original potential resource estimation of the prospect is close to 100 MMboe. According to play analysis of the region, this Upper Oligocene play could have up to 5000 km2 of prospective area.


AAPG Search and Discovery Article #90026©2004 AAPG Annual Meeting, Dallas, Texas, April 18-21, 2004.