Integrative analysis of a lacustrine carbonate reservoir, Kambala field, Cabinda, Angola

Conference · Wed Sep 01 04:00:00 EDT 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:6852079

Lomando, A J; Griscom, M ^[1]

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1. Chevron Overseas Petroleum Inc., San Ramon, CA (United States)

The presalt lacustrine rift basins of west Africa are the continued focus of exploration and development in this prolific petroleum province. Kambala field produces from the Barremian-Aptian lacustrine carbonates of the TOCA Formation. Source rocks are the rich lacustrine shales of the Bucomazi Formation. TOCA carbonates were deposited along major shorelines and around islands in large lake systems. Reservoir studies provide the necessary models and analogs to guide exploration and evaluation efforts. The TOCA reservoirs in Kambala field have been subdivided into two units. The lower TOCA is characterized by limestones and cherty dolomites, which range texturally from high-energy ooid and oncoid grainstones and packstones to lower energy ostracod wackestones and marls. The upper and lower TOCA are separated by a unit of middle Bucomazi shale. The upper TOCA is composed of thin beds of low-energy facies and thick porous carbonate units, which are pervasively dolomitized. Kambala field sits over a northwest-southeast-trending basement high. The field is bounded by intense faulting on the west and dips gently to the northeast. The faults on the eastern side are more widely spaced and have less throw than the ones on the west. Seismic amplitude maps on the upper TOCA show markedly higher amplitudes on the western and southern edges of the field. The high seismic amplitudes and intense faulting generally correlate with the zone of porous dolomite.

• OSTI ID: 6852079
• Report Number(s): CONF-9310237--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 77:9
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
AFRICA
ANGOLA
CARBONATE MINERALS
CARBONATE ROCKS
DEVELOPING COUNTRIES
DOLOMITE
ENERGY SOURCES
EXPLORATION
FOSSIL FUELS
FUELS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
LIMESTONE
MINERALS
PETROLEUM
RESERVOIR ROCK
RIFT ZONES
ROCKS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SHALES
SOURCE ROCKS