ROJAS, BETHY, ANA SALAZAR, and JOSE SAMBRANO, Corpoven, S.A., Puerto La Cruz, Venezuela
ABSTRACT: Sequence
Stratigraphy
Analysis
of Carapita E Lower Miocene; North of Monagas, Venezuela
The Carapita E sandstone is of lower Miocene age, and occurs in the maturin sub-basin within the active thrust belt of the eastern Venezuela tertiary foreland basin. This basin is a prolific hydrocarbon basin and the Carapita sandstones form an important reservoir system. This study is based on an integration of well
logs and cores from 56 wells covering an area of more than 39.000 sq km the sediments were interpreted in terms of depositional environments and
sequence
stratigraphic patterns.
The sandstone unit overlies a type 1 sequence
boundary (25,5 m.y.) and in the central and western part of the study area it is interpreted as a lowstand systems tract, deposited within an incised valley on the shelf. Further east, the sediments were deposited in a coastal to shelf setting and the unconformable
sequence
boundary is interpreted to pass into a correlative conformity. These more distal shoreline sands from a shelf-perched lowstand prograding wedge which is coeval with the incised valley fill further landward they comprise coastal and nearshore deposits in the form of prograding coastal/deltaic bars and shoreline sands.
This detailed sedimentological and sequence
stratigraphic study has resulted in improved productivity and optimization of hydrocarbon recovery from the Carapita E sands.
AAPG Search and Discovery Article #90988©1993 AAPG/SVG International Congress and Exhibition, Caracas, Venezuela, March 14-17, 1993.