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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology


Journal of Petroleum Geology, Vol.3, No.3, pp. 247 -278, 1981

©Copyright 2000 Scientific Press, Ltd.


Francisco Viniegra*

*Consulting geologist, Apartado Postal 338 Suc. "A", Cuernavaca, Morelos, Mexico.


Since 1972, numerous large and giant fields have been discovered in the Reforma area of Chiapas and Tabasco States, southern Mexico, and on the offshore Campeche shelf west of Campeche State. The huge carbonate bank with which these discoveries are associated is called the Great Carbonate Bank of Yucatán. Most of the Reforma fields produce from bank-edge talus, now largely dolomitized, of Late-Jurassic and Early- to Middle Cretaceous ages, and drilling depths to the tops of the reservoirs generally range from 3,800-4,500m. The offshore discoveries include fields which are productive mainly in bank-edge talus of Paleocene and Late-Jurassic ages, and depths to the top of production generally are shallower than onshore--1,260-3,500m. The petroleum source materials for the Jurassic, Cretaceous, and Paleocene fields are believed to be mainly in Late-Jurassic strata, but some Early-Cretaceous sources cannot be eliminated. Middle-Cretaceous rocks have not yet been identified beneath the offshore shelf from Tampico (Arenque) to Samaria (A. J. Bermúdez) and Conduacán. Although most of the discovered fields contain mainly oil, some of the fields contain gas and condensate.

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