Abstract.

The paper reviews the oil provinces, known as Chiapas-Tabasco (onshore) and Sonda de Campeche (offshore). Both are situated in the southeastern part of Mexico.

During the year 1972, the first fields within the Chiapas-Tabasco area, Cactus and Sitio Grande, were discovered. Producing horizons are Cretaceous carbonates. The area explored in detail amounts to about 9000 km'; 28 oilfields have been discovered so far.

The offshore area surveyed in detail amounts to 12 O00 km2. The first exploration well Chac No. 1 was drilled in 1976. This discovery produced from a calcareous breccia of Palaeocene age. Meanwhile 12 oil fields have been discovered.

The geological and geophysical information acquired in the meantime points to the fact that both areas belong to the same geological regime-an extensive calcareous platform, the traps being intensively folded and faulted anticlines.

Important discordances were observed within the stratigraphic column, the latter reaching from Mesozoic to Tertiary time. The presence of sait in some of the structures has been established.

About a hundred drilling rigs are active in onshore exploration and exploitation, the drilling capacity being up to 6500 m. The gravity of the oil produced ranges from 28" to 40" API. The daily production amounts to about 1 million barrels from 190 wells only.

For the further development of the offshore area several alternatives are seen: in the long term one envisages the installation of 77 platforms for drilling, production, pipeline linkages, living accommodation etc. The oil produced consists of two types, a heavy one of 22" API and a light one ranging from 30" to 35" API. The daily production of the area is in the order of 1.5 million barreis.

Résume. Cette communication fait le point sur les provinces pétrolières connues sous les noms de Chiapas-Tabasco à terre et Sonda de Campeche en mer, toutes deux situées dans le Sud-Est mexicain.

Les gisements de Cactus et de Sitio Grande, découverts en 1972, produisent du pétrole à partir d'un calcaire crétacé. Dans cette zone explorée en détail et comportant environ 9000 km', il existe actuellement 28 gisements pétroliers.

L'exploration détaillée en mer couvre 12 O00 km'. Elle a commencé en 1976 avec le forage du puits Chac-1 qui produit du pétrole à partir d'une brèche calcaire du Paléocène. Actuellement 12 gisements pétroliers ont été découverts.

Les données géologiques et géophysiques obtenues jusqu'à présent démontrent que les deux zones appartiennent au même régime géologique et qu'elles se trouvent sur une plate-forme calcaire d'une grande extension avec des p

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