Sedimentological and petryphysical characterization of the Cogollo Group, Cretaceous, Block IX, Maracaibo Lake

Conference · Mon Feb 01 00:00:00 EST 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5941642

Munoz, P; Verenzuela, X ^[1]; Franssen, R; Vahrenramp, V ^[2]

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1. Maraven S.A., Caracas (Venezuela)
2. Shell Research B.V., Rijswijk (Netherlands)

The present study contains the most important results from the sedimentological and petrophysical analysis of two Cretaceous cores (SVS-225/229) located in the Block IX of Lake maracaibo, northwestern Venezuela. In order to better define and locate sites for exploratory drilling, a study was undertaken to describe calcareous facies and their relationship to matrix porosity, open fractures, sedimentary and flow units. The sedimentary units were grouped on the basis similar characteristics and vertical and horizontal extrapolation potential. They also serve as indicators to determine the major sedimentary environments and help define the sedimentological model for the section under study. The most promising calcareous facies are composed of dolomites, wackestones, packstones and grainstones. They are all related to the open fractures, their orientation and density. The flow units were determined using these characteristics together with the oil impregnation observed in the cores. Also they were found to be mainly related to the coarsening upper sedimentary sequences. The identification of these units and their correlation to neighboring areas is useful for in the effectively managing processes for the Cretaceous oil reservoirs.

• OSTI ID: 5941642
• Report Number(s): CONF-930306-; CODEN: AABUD2
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 77:2; Conference: International congress of the American Association of Petroleum Geologists (AAPG), Caracas (Venezuela), 14-17 Mar 1993; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CARBONATES
INDICATORS
DRILL CORES
PETROLOGY
VENEZUELA
EXPLORATORY WELLS
EXTRAPOLATION
GEOLOGIC FRACTURES
ORIENTATION
POROSITY
RESERVOIR ROCK
SEDIMENTARY ROCKS
CARBON COMPOUNDS
DEVELOPING COUNTRIES
GEOLOGIC STRUCTURES
GEOLOGY
LATIN AMERICA
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
ROCKS
SOUTH AMERICA
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration