Abstract: Detachments and Structures in the Cuban Overthrust Belt

Rafael Socorro, Sofia Lopez

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 which are named, from south to north, Placetas, Camajuan^phgr and Colorados, composed by pelagic and slope carbonates and Cayo Cocos and Remedios, however, were deposited in shallow water environment in the same time.

The rocks of the TSU Placetas, the best well known today by wells and seismic sections, have different levels of detachments and they formed structures, which contain the 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.

Inside the complex of synorogenic rocks (Campanian-Middle Eocene) are under discussion the presence of the other detachment levels, associated with the clay stratas.

Finally is showing the stratigraphic section of the Placetas unit with the detachment levels. Also is proposing to the others TSU detachment levels in base of study of seismic sections controlled by deep wells.

AAPG Search and Discovery Article #90950©1996 AAPG GCAGS 46th Annual Meeting, San Antonio, Texas