Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 10-17.doi: 10.12108/yxyqc.20230602

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics of hydrocarbon accumulation in deep-water depositional system in offshore East Africa

SHI Buqing1, DING Liangbo2, MA Hongxia2, SUN Hui2, ZHANG Ying2, XU Xiaoyong2, WANG Hongping2, FAN Guozhang2   

  1. 1. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China;
    2. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China
  • Received:2023-06-19 Revised:2023-07-20 Online:2023-11-01 Published:2023-11-07

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Abstract: Using high quality 3D seismic and logging data,Paleocene-Oligocene deep-water depositional system in Rovuma Basin and Upper Cretaceous deep-water depositional system in Zambezi Depression were studied,and the hydrocarbon accumulation conditions of both deep-water depositional systems were compared. The results show that:（1）Channel and lobe sands are large-scale favorable reservoirs in Paleocene-Oligocene deepwater depositional system in Rovuma Basin,and the reconstruction of contour current is the key factor for the formation of high-quality reservoirs.（2）Typical deep-water deposits,such as channels,lobes,block transport deposits,are developed in Upper Cretaceous in Zambezi Depression,while large scale drifts possibly are highquality reservoirs.（3）A large amount of hydrocarbon was potentially accumulated in Upper Cretaceous deepwater sands in Zambezi Depression,which was generated from Lower Cretaceous shale of restricted marine environment. Reservoirs were capped by widely distributed HST shale,and lithologic traps could be assumed by up dip pinch-out. With good conditions for hydrocarbon accumulation,it is a favorable area for next oil and gas exploration.

Key words: deep-water sediments, gravity current, contour current, lithologic trap, Cretaceous, Zambezi Depression, Rovuma Basin, offshore East Africa

CLC Number: 

  • TE121.3
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