Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 92-105.doi: 10.12108/yxyqc.20230611

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Main controlling factors and hydrocarbon accumulation models of structurallithologic reservoirs above source kitchen in rift basins in South Sudan

MA Feng1, PANG Wenzhu2, ZHAO Wenguang2, ZHANG Bin1, ZHAO Yanjun2, XUE Luo1, ZHENG Xi1, CHEN Bintao1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    2. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China
  • Received:2023-05-19 Revised:2023-06-01 Online:2023-11-01 Published:2023-11-07

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Abstract: Based on drilling,logging and 3D seismic data,core analysis,well correlation,oil and gas migration and accumulation simulation,seismic inversion and multi-information superposition methods were used to analyze the main controlling factors of structural-lithologic reservoirs above source kitchen in Melut and Muglad rift basins in South Sudan from three aspects:oil source conditions,reservoir and cap-rock assemblage and migration systems,and hydrocarbon accumulation models were discussed. The results show that:（1）The Melut and Muglad basins both developed high-quality source rocks in the I stage rifting period of the Early Cretaceous with large thickness,wide area,good organic matter type and moderate maturity,providing good oil source conditions. The Paleogene Yabus Formation and Neogene Jimidi Formation in Melut Basin,and Cretaceous Aradeiba Formation in Muglad Basin developed delta facies and fluvial deposits,and the microfacies sand bodies of river channels and underwater distributary channels had moderate sand content and sandstone thickness,and sealing zones in floodplains and underwater distributary bays are locally developed.The sand-mud interlayer reservoir and cap assemblage formed on multiple sources,and the reservoir and cap-rock assemblage and its vertical sedimentary evolution controlled the formation of large-scale structural-lithologic traps. The boundary-controlled basin faults and the depression-controlling faults in the slope area of the basin margin were the main vertical migration channels of oil and gas connecting the main source rock and the target layer above source kitchen. The multi-stage unconformities and sand-rich strata above source kitchen formed multiple lateral dominant migration paths（transport ridges）. The coupling of the source faults and transport ridges controlled the favorable zones of the structural-lithologic reservoirs above the source kitchen in Melut and Muglad basins.（2）The Yabus Formation,Jimidi Formation in Melut Basin and Aradeiba Formation in Muglad Basin have the petroleum geological conditions for the formation of scale structural-lithologic reservoirs above source kitchen,and the accumula-tion models are vertical migration of fault,vertical migration of fault and lateral migration of unconformity plane,and vertical migration of fault and lateral migration of connected sandbodies.

Key words: rift basin, basin-controlling fault, depression-controlling fault, transport ridges, structural-lithologic reservoir, hydrocarbon accumulation model, Melut Basin, Muglad Basin, South Sudan

CLC Number: 

  • TE122.1
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