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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 52 (2002), Pages 925-934

Hydrocarbon Source and Charge in the Neogene in the Macuspana and Veracruz Basins, Mexico

Talukdar, S. C., Guevara. E. H., Jones, R. H., Galindo, Agustin, Romero, M. A., Wawrzyniec, T. F.,*, Villanueva, Laura, Fouad, Khaled, Ambrose, W. A., Jennette, D. C., Dunlap, D. B., Meneses-Rocha, J. J., Sanchez-Barreda, Luis, Lugo, J. E.

ABSTRACT

Gas accumulations in Neogene reservoirs in the Macuspana and Veracruz Basins of Mexico contain mostly thermogenic-biogenic gas mixtures in different proportions. Biogenic gases may be locally volumetrically important in shallow reservoirs generally away from major deep faults, but pure biogenic gases are rare in known reservoirs.

Immature Miocene and Pliocene shales sourced biogenic gases in the two basins. Thermogenic gases were generated and migrated from deeper Tertiary shales and Mesozoic shales and limestones. Assessment of organic richness, quality, and present-day maturity distribution of Mesozoic, Paleogene, and Miocene source rocks, as well as 1D maturity and hydrocarbon generation modeling, indicate that thermogenic gas generation from the Mesozoic sources is much more significant than that from Paleogene and lower Miocene sources. Timing of gas generation and migration from the Mesozoic and Paleogene sources in relation to the timing of trap formation and the existence of vertical migration pathways (major faults) are the critical factors that controlled migration of the thermogenic gases for accumulation in traps with Neogene reservoirs and seal. Traps connected by faults to the Mesozoic sources had the possibility of receiving greater thermogenic gas charges.


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