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Reevaluation of the Pre-Salt petroleum system of Cabinda, Angola

Journal Article · · AAPG Bulletin
OSTI ID:421198
 [1];  [2];  [3];  [4]
  1. Chevron, San Ramon, CA (United States)
  2. Sonangol, Luanda (Angola)
  3. Elf, Luanda (Angola)
  4. Agip, Luanda (Angola)
+ Show Author Affiliations
The Pre-Salt sedimentary section of Cabinda, Angola is located in the Lower Congo Basin. The Pre-Salt stratigraphic section consists of lacustrine siliciclastics, and carbonates that predate the extensive Mid-Aptian Loeme Salt. Over 500 MMBO of proven recoverable reserves exist in pre-salt objectives with some individual fields as large as 250 MMBO recoverable. A reevaluation of Cabinda pre-salt petroleum system based on the extensive available well dataset and recent high-quality 3D seismic surveys has been performed by a four-geoscientist team provided by the JV partners in Cabinda (1. Sonangol, 2. Chevron, 3. Elf Aquitaine, 4. Agip). The group worked for one year at Chevron`s facility in San Ramon, California, with technical assistance from specialists in each company provided when necessary. The petroleum system of Cabinda can be briefly described as follows: (1) Source rocks are Neocomian to Barremian lake-shales with up to 30 % TOC (Excellent reservoirs are Lower Neocomian to Barremian sandstones and/or diagenetically enhanced lacustrine carbonates. Cabinda has the only major production from Lacustrine Carbonates in West Africa. Seals are syn-rift lake-shales or a combination of these shales and salt. Traps primarily result from syn-rift deformation but post-rift basement-involved movements probably also occurred.); and (2) Geochemical analyses show that most of the oil produced from both Pre- and Post-Salt reservoirs have a Pre-Salt source, demonstrating the discontinuity of Loeme salt as a regional seal.
OSTI ID:
421198
Report Number(s):
CONF-9609255--
Journal Information:
AAPG Bulletin, Journal Name: AAPG Bulletin Journal Issue: 8 Vol. 80; ISSN 0149-1423; ISSN AABUD2
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
ANGOLA
EXPLORATION
PETROLEUM
RESERVES
SALT DEPOSITS
SEDIMENTARY BASINS
SOURCE ROCKS