Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 45-53.doi: 10.12108/yxyqc.20230606

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Evolution of Senegal Basin and exploration prospects of lithologic reservoirs

LI Hengxuan, WEN Zhixin, SONG Chengpeng, LIU Zuodong, JI Tianyu, SHEN Yiping, GENG Ke   

  1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2023-06-19 Revised:2023-07-24 Online:2023-11-01 Published:2023-11-07

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Abstract: Passive continental margin basins have low exploration degree and high potential,and Senegal Basin is one of the exploration hotspots of passive continental margin basins in recent years. Based on plate tectonic evolution,the evolution process of Senegal Basin was restored using seismic and geologic data,and the exploration prospects of lithologic reservoirs were analyzed. The results show that:（1）The Senegal Basin can be divided into three evolution stages,incluing intra-continental rift during the Middle Triassic rift,inter-continental rift during the Late Triassic to Early Jurassic transition,and passive continental margin during the Middle Jurassic to the present drift. Controlled by paleostructure and paleoclimate,the rift sediments are thin and buried deeply,mainly in continental red beds stratigraphic sequence. Evaporite facies develop widely in intercontinental rift. The drifting sequence deposits with large thickness and deep-water sedimentary system are important reservoirs in discovered oil and gas fields.（2）The Lower Cretaceous Albian delta sand bodies were mainly developed in the deep-water area of the Middle sub-basin,and the Lower Cretaceous fault-lithologic reservoirs were formed by lateral or vertical migration of oil and gas. The Upper Cretaceous Cenomanian-Maastrichtian turbidity fan sand bodies were developed in the ultra-deep water area,and the oil and gas migrated upward to form Upper Cretaceous submarine fan lithologic reservoirs. Miocene turbidite fan sand bodies were mainly developed in Mauritania and Casamance salt basins,salt diapirs have important effects on oil and gas migration and sealing,forming salt structure related oil and gas reservoirs.（3）Combined with the discovered law of oil and gas accumulation,the Upper Cretaceous submarine fan reservoirs may be developed in Mauritania and Casamance subbasins without drilled wells,while the reef-shoal reservoirs may be developed in the carbonate platform of the entire basin shelf,and they are the next key exploration areas.

Key words: lithologic reservoir, prototype basin, intra-continental rift basin, inter-continental rift basin, passive continental margin basin, deep-water deposit, submarine fan, turbidite fan, reef-shoal, Senegal Basin

CLC Number: 

  • TE121.1+1
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