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

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

OSTI ID:6127742

Rodriguez, A; Rampazzo, M

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.

• OSTI ID: 6127742
• Report Number(s): CONF-880301-
• Country of Publication: United States
• Language: English

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04 OIL SHALES AND TAR SANDS
040200* -- Oil Shales & Tar Sands-- Reserves
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CENOZOIC ERA
DATA ANALYSIS
DEVELOPING COUNTRIES
DRILL CORES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
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SURFACE WATERS
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