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Characterization of the Organic Matter in Upper Jurassic and Cretaceous Basins Southeastern Mexico

Abstract

We analyzed nearly 1,800 samples of rock (core and cutting) to enable the characterization of fossil organic matter present in the Upper Jurassic and Cretaceous Basins of Southeastern Mexico. To this end, cross-sections were drawn, which included more than 60 oil wells. The study of these sections and their arrangement allowed for a type setting facies and thermal maturity (% Ro equivalent) of a total area of approximately 19.350 km2. To determine with greater certainty organic facies, all samples were analyzed optically, using transmitted light and fluorescent light techniques and confocal laser microscopy. As an additional tool for a comparison, some samples were also analyzed (approximately 700 samples) by the Rock-Eval pyrolysis technique for obtaining parameters Tmax, HI, OI and TOC. In general, we define various organic facies of which can be mentioned organic matter algal material interspersed with amorphous bituminous horizons and organic matter sapropelic horizons. Likewise, is observed in some samples, the presence of hydrocarbons. The organic matter which has more evolution, has a thermal equivalent maturity equivalent Ro 0.69%, while less organic matter has evolved heat equivalent values Ro 0.28%. REFERENCES Alexander R., Kagi R.I., Woodhouse. (1981) Geochimical correlation of Winlandia oil and extracts of Winning Group (Cretaceus) potencial source rock, Barrow subbasin, western Australia. A.A.P.G. Bull. V. 65 pp. 235–250. Baley N.J., Evans C.R., Mulner C.W.D. (1974). Applying petroleum geochemistry to search for oil: examples from western Canada basin. A.A.P.G. Bull. V. 58 pp. 2284–2294. Bertrand C.C (1987). Apuntes de geoquímica orgánica aplicada a la prospecciòn petrolera. D.E.P.F.I., UNAM. Bray y Evans (1961). Mencionado en Apuntes de geoquímica orgánica aplicada a la prospecciòn petrolera. D.E.P.F.I., UNAM., 1987. Connan J.J. (1986). The microbial input in carbonate-anhidryte facies of a sabkha paleoenvironments from Guatemala: a molecular aproach. En Leythaeuser, D:J: Rullkotter (Eds.) Advances in Geochemistry 1985, part 1 (Organic Geochemistry). V. 10 pp. 29–50. Clark J.P. y Philp R.P. (1989). Geochemical characterization of evaporates and carbonates depositational environments and correlation of associates crude in the Black Creek basin, Alberta. Bull. Of Canadial Petroleum geology, Vol. 37, No. 4 pp. 401–416.