Gas Generation Potential of Upper Jurassic (Tithonian) Source Rocks in the Sonda de Campeche, Mexico
Demetrio Santamaría-Orozco, Brian Horsfield, 2003. "Gas Generation Potential of Upper Jurassic (Tithonian) Source Rocks in the Sonda de Campeche, Mexico", The Circum-Gulf of Mexico and the Caribbean: Hydrocarbon Habitats, Basin Formation and Plate Tectonics, Claudio Bartolini, Richard T. Buffler, Jon F. Blickwede
Download citation file:
In the Sonda de Campeche offshore region of Mexico, the Tithonian sedimentary sequence is the most important source of hydrocarbons that occur today in Paleocene traps. The maturity of both source rocks and petroleum in reservoirs is known to increase from northeast to southwest across the region. This is manifested at the molecular level and in bulk petroleum properties such as API gravity and gas-oil ratio (GOR). We have analyzed a selection of source-rock samples from across the area, covering the entire maturity spectrum, by pyrolysis gas chromatography. These data give insights into the GOR of yet-to-be-generated petroleum for each maturity stage. A mass-balance model based on these same data and complementary data from laboratory experiments (MSSV pyrolysis) provided cumulative GOR as a function of generation stage (transformation ratio). Regional field GOR trends are consistent with instantaneous rather than cumulative GOR predictions, thereby supporting the notion of mainly localized vertical migration avenues in association with a late timing of trap formation.
Figures & Tables
The Circum-Gulf of Mexico and the Caribbean: Hydrocarbon Habitats, Basin Formation and Plate Tectonics
The Circum-Gulf of Mexico and the Caribbean has long been one of the world's most important petroleum provinces, as well as one of the world's most geologically complex regions. These two characteristics have resulted in an extensive amount of ongoing research by both industry and academia. AAPG Memoir 79, The Circum-Gulf of Mexico and the Caribbean, is the first volume in more than a decade to document such a wide range of research on the geology of this vast area. Of the total 44 papers, roughly two-thirds pertain to the Gulf of Mexico, with an emphasis on the Mexican portion of the basin, and to the petroliferous areas of the southern Caribbean, including Colombia, Venezuela, Cuba, and Trinidad and Tobago. The remaining papers relate to the Antilles and Central America, as well as a series of papers that address region-wide topics such as plate tectonic evolution. A significant number of papers were contributed by authors from national oil companies and universities from within the region.