Facies analysis and seismic stratigraphic interpretation of cored Paleocene carbonate sequence in Block III, Lake Maracaibo, Venezuela

Conference · Mon Feb 01 04:00:00 EST 1988 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5498179

Rodriguez, A; Rampazzo, M ^[1]

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1. Maraven S.A., Caracas (Venezuela)

The cored Paleocene carbonate sequence found in wells VLC-812 and VLC-950, together with ditch samples from wells VLC-750 and VLC-693 in Block III, Lake Maracaibo, present a recurrent lithology which can be represented in seven sedimentary facies groups. The recognized facies range from a mollusk-rudstone to a sandy oolitic grainstone. The most important facies is a highly porous, oil-bearing grainstone. The above-mentioned facies were grouped into a facies assemblage which was then interpreted in terms of its depositional environment. A genetic facies model was constructed in order to explain lateral and vertical facies changes and for regional prediction purposes. This facies model predicts a commercial porosity development in a preferred orientation in the Block III area. A seismic-stratigraphic interpretation, which took into account the sedimentary facies model, documents a paleoshoreline at the time of the oolitic grainstone sedimentation. This finding confirmed the favorable prospective zones proposed by the sedimentary facies model for better porosity development in the carbonate sequence. This sedimentary facies/seismic-stratigraphic model can form the basis for hydrocarbon exploitation and exploration for carbonate rocks with similar geological characteristics and most importantly can be used where there are widely spaced wells.

• OSTI ID: 5498179
• Report Number(s): CONF-880301--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 72:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CARBONATE ROCKS
CENOZOIC ERA
DEVELOPING COUNTRIES
EXPLORATION
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
GEOLOGY
GEOPHYSICAL SURVEYS
LATIN AMERICA
LITHOLOGY
MINERAL RESOURCES
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEISMIC SURVEYS
SOUTH AMERICA
STRATIGRAPHY
SURVEYS
TERTIARY PERIOD
VENEZUELA