Mexico's oil production comes from three main provinces which according to their importance could be arranged as follows:

(1) Northern zone (Tampico-Tuxpan oil fields), (2) Southern zone (Isthmus, Saline Basin), and (3) Northeastern Mexico.

Most of the production of the Tampico-Tuxpan oil fields comes from the Tamaulipas limestone, Cretaceous in age, and which has a wide variation of facies. The total production from these fields has amounted to 2,160 million barrels, divided in three main producing areas: Faja de Oro (Golden Lane), Panuco-Ebano, and Poza Rica.

The Isthmus oil fields produce from Miocene sands and a very small production has been obtained from cap rocks. All producing structures in the Isthmus areas are related to salt domes. The total production obtained from these fields is about 140 million barrels.

No commercial production has been found until recently in northeastern Mexico, but some gas fields have been in production for several years.

Pemex has discovered recently the Reynosa field, which has two producing oil wells with a capacity of about 1,100 barrels per day for both wells.

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