--> Abstract: Thermo-Mechanical Modeling in Lower Congo Basin: Implications on the Understanding of Labe-Pinda (!) Petroleum System, by C. J. Pereira, A. Silva, F. T. T. Gonçalves, R. P. Bedregal, F. G. Gonzaga, and A. Moraes; #90933 (1998).

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Abstract: Thermo-Mechanical Modeling in Lower Congo Basin: Implications on the Understanding of Labe-Pinda (!) Petroleum System

Pereira, C. J.; Silva, A. - Sonangol; Gonçalves, F. T. T.; Bedregal, R. P.; Gonzaga, F. G.; Moraes, A. - Petrobras/Cenpes

A 1-D modeling study was performed in selected wells from Block #2, Lower Congo Basin, in the northern Angolan shallow platform. The integration of modeling results with geologic and geochemical data has greatly enhanced the level of understanding of the labe-Pinda (!) petroleum system in the studied area.

The Congo Basin is a rift which evolved to a passive margin during the Cretaceous. The source rock comprises the Cenomanian marls from labe Formation, the reservoirs are the Pinda Formation Albian limestones and the seals are the pelitic rocks from labe Formation. Petroleum is trapped in anticlines associated to listric faults formed in response to salt movement.

This study comprised tectonic, thermal and kinetic simulations, which allowed the definition of subsidence history, estimative of crustal and sub-crustal stretching factors and bottom paleo-heat flow, and reconstruction of thermal and maturation history of the source rock. The kinetic simulation show that maximum kerogen transformation ratio ranges from 10-20% in the Block #2 area. The pod of active source rock is located offshore, where labe Formation has reached 4000m depth. Therefore, a medium to long distance migration (30 to 50km) is required to the formation of the oil accumulations in this block and onshore areas.

AAPG Search and Discovery Article #90933©1998 ABGP/AAPG International Conference and Exhibition, Rio de Janeiro, Brazil