Facies control on oil producing, naturally fractured reservoirs

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5965688

Rodriquez, A; Marquez, X

A facies model which predicts the lateral continuity of the facies present in Block I is proposed as a tool for oil exploration and exploitation for this area and other areas with similar sedimentological characteristics. In Block I, Lake Maracaibo, oil producing intervals in the Cretaceous have been found to be facies controlled. Detailed studies of the cored sections in various wells have shown that facies Ls2, characterized by an oolitic grainstone, is the main producing reservoir. This facies has been interpreted as deposited as an oolitic shoal in a shallowing-upward sequence. Other facies such as Ls1, represented by a bioclastic rudstone, and Ls, composed of a mudstone, are also present but do not show significant oil production. The presence of subvertical, open, hairline fractures and centimeter-scaled wide, bridged fractures in facies Ls2 can explain its great producing capacity, while the presence of calcite mineralized fractures in LsI and absence of fractures in Ls account for the poor producing capability of these facies.

• OSTI ID: 5965688
• Report Number(s): CONF-880301-
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040500* -- Oil Shales & Tar Sands-- Properties & Composition
CRETACEOUS PERIOD
DEVELOPING COUNTRIES
DRILL CORES
FORECASTING
FRACTURED RESERVOIRS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
LAKES
LATIN AMERICA
MESOZOIC ERA
MINERAL RESOURCES
OIL SHALE DEPOSITS
OIL YIELDS
RESOURCES
SOUTH AMERICA
STRUCTURAL MODELS
SURFACE WATERS
VENEZUELA
YIELDS