--> ABSTRACT: Geologic Evolution and Play Distribution of Burgos Basin, Mexico, by Guillermo A. Perez-Cruz; #91020 (1995).

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Geologic Evolution and Play Distribution of Burgos Basin, Mexico

Guillermo A. Perez-Cruz

Condensate and gas production in the Burgos Basin is associated with a major petroleum system. Source rocks of this system were formed during major transgressive episodes in Lower Paleocene, Middle Eocene and Lower Oligocene. They contain Type II and III kerogens, and 0.2 - 1.5% TOC.

Recent geochemical studies of source rocks and condensates confirm that the source rocks become progressively younger and more gas prone toward the east. Since a satisfactory geochemical correlation has not been yet demonstrated, the level of certainty of the Burgos Petroleum System is hypotetical.

Condensate and gas production in this basin comes from sand intervals associated with 8 different plays. Most of the productive intervals in these plays contain shallow water (transitional to middle neritic) well sorted, fine to medium grain sands, with average thickness of 20 m, average porosity of 18% and typical water saturations of 50%. More than 50 sand intervals are present in these plays at depths that vary from 1,200 to 3,500 m below sea level. In most of these plays trap mechanism is associated with rollover anticlines of major growth fault systems, and seal intervals correspond to widespread shale layers of variable thickness overlain reservoir sands.

Play distribution is concentrated in the northern part of the basin where subsidence, sedimentary supply, burial, maturity, and preservation are appropiated for generation, expulsion, migration and accumulation of commercial amounts of hydrocarbons.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995