Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 128-140.doi: 10.12108/yxyqc.20220412

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary characteristics and source control of Lower Jurassic in coastal basins of East Africa

ZHANG Junlong1,2, HE Youbin1,2, LIANG Jianshe3, QIU Chunguang3, WU Dongsheng1,2, LI Hua1,2, TONG Le1,2   

  1. 1. School of Geosciences, Yangtze University, Wuhan 430100, China;
    2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    3. CNOOC International Ltd., Beijing 100028, China
  • Received:2022-04-06 Revised:2022-04-22 Online:2022-07-01 Published:2022-07-07

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Abstract: The Lower Jurassic source rocks are the main source rocks in the coastal basins of East Africa. Based on the data of logging, drilling, seismic and geochemical analysis, combined with regional tectonic evolution, the sedimentary characteristics of the Lower Jurassic in the coastal basins of East Africa were analyzed and described, and the genetic model and main controlling factors of the main source rocks were characterized and evaluated by considering the characteristics of source rocks in the basins. The results show that:(1)The sedimentary environment of narrow and long occluded bay was formed by regional tectonism in the Early Jurassic in the coastal basins of East Africa,and the sedimentary systems of river,delta coastal shallow sea,confined sea or shallow sea were developed.(2)The limited marine mudstone developed in the Lower Jurassic is the high-quality source rocks of the basins,with an average TOC of 4.2%. The organic matters are mainly type Ⅰ-Ⅱ1,which has reached mature to over mature evolution stage. The mudstone is thick and widely distributed,and has great hydrocarbon generation potential. The development and distribution of main source rocks are affected by its unique sedimentary environment of bay,and the quality and hydrocarbon generation potential of main source rocks in the basins gradually improve from north to south.(3)There are three genetic models of source rocks in the coastal basins of East Africa:restricted marine sedimentary type,lagoon sedimentary type and delta sedimentary type. Among them,the restricted marine sedimentary source rock is the main genetic type of high-quality source rocks. The lithology is mainly composed of stably distributed thick mudstone and intercalated with thin sandstone,which is generally evaluated as good source rocks.(4)The most favorable hydrocarbon generating zones are located in the central areas of Rovuma Basin and Tanzania Basin on the coast of East Africa. The research results can provide reference for the next exploration and development of coastal basins in East African.

Key words: source rocks, tectonic evolution, bay sedimentary environment, restricted marine, favorable hydrocarbon generation zone, Lower Jurassic, East African coast

CLC Number: 

  • TE122.1+15
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