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Abstract

Clara Valdes, M. d. L., L. Villanueva Rodriguez, and E. Caballero Garcia, 2009, Geochemical integration and interpretation of source rocks, oils, and natural gases in southeastern Mexico, in C. Bartolini, and J. R. Roman Ramos, eds., Petroleum systems in the southern Gulf of Mexico: AAPG Memoir 90, p. 337368.

DOI:10.1306/13191091M903337

Copyright copy2009 by The American Association of Petroleum Geologists.

Geochemical Integration and Interpretation of Source Rocks, Oils, and Natural Gases in Southeastern Mexico

Ma. de Lourdes Clara Valdes,1 Laura Villanueva Rodriguez,2 Ernesto Caballero Garcia3

1Petroleos Mexicanos (PEMEX) Exploracion y Produccion, Activo Regional Exploracion Sur, Mexico
2Petroleos Mexicanos (PEMEX) Exploracion y Produccion, Activo Regional Exploracion Sur, Mexico
3Petroleos Mexicanos (PEMEX) Exploracion y Produccion, Activo Regional Exploracion Sur, Mexico

ACKNOWLEDGMENTS

We are grateful to Robert Katz for the time spent reviewing this manuscript. Katz's suggestions and comments were very constructive and helpful.

ABSTRACT

The identification and characterization of source rocks, represented by their organic richness, quality, distribution, and maturity, are important for evaluating the petroleum systems in a sedimentary basin. The geochemical characterization of the source rocks is accomplished by the analysis and evaluation of their contained organic carbon. Used parameters (total organic carbon, free hydrocarbon (S1), potential hydrocarbon (S2), maximum temperature (Tmax), hydrogen index (HI), oxygen index (OI), production index (PI), etc.) are derived from pyrolysis studies of outcrop, cuttings, and core samples. Other tools are gas chromatography-mass spectrometry (GC-MS), isotopes of specific compounds, and carbon isotopes of surface seep material, oil, and gas that define source rock affinity, depositional environment, and maturity level. The following reional source rock systems have been identified in the southeastern basins of Mexico: Upper Jurassic Oxfordian (!), Upper Jurassic Tithonian (!) argillaceous facies (JS1), Upper Jurassic Tithonian (!) calcareous-argillaceous facies (JS), Lower Cretaceous (!) carbonate-evaporite, and lower Miocene (!) marine deltaic siliciclastic.

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