ABSTRACT

The cuban overthrust belt, outcropping onshore and in the southern part of offshore of the island, is formed by the different tectono-stratigraphic units (TSU). They are named, from south to north, Placetas, Carrajuani and Colorados, and are composed of pelagic and slope carbonates. Cayo Cocos and Remedios, however, were deposited in shallow water environment at the same time.

The rocks of the TSU Placetas are best known from wells and seismic sections. They have different levels of detachments and structures which contain deposits of oil and gas.

The main levels of detachments are associated with rocks of the Santa Teresa Formation (Aptian-Albian), Ronda Formation (Tithonian) and to the bottom of the Constancia Formation (Oxfordian-Kimmeridgian). The secondary detachments are associated with the. rocks of the Lower Cretaceous and to the top and middle part of the Constancia Formation.

The presence of other detachment levels inside the complex of syncrogenic rocks (Campanian-Middle Eocene) is under discussion. They are associated with clay strata.

The stratigraphic section of the Placetas unit with the detachment levels is shown. TSU detachment levels in the base of seismic sections is proposed to others and deep wells add control.

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