Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 23-33.doi: 10.12108/yxyqc.20200503

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Hydrocarbon accumulation models and exploration potential of near-source Cretaceous in the lower assemblage of Melut Basin,South Sudan

SHI Zhongsheng1,2, PANG Wenzhu3, CHEN Bintao1, XUE Luo1, ZHAO Yanjun3, MA Lun1   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. Key Laboratory of Reservoir Description, CNPC, Lanzhou 730020, China;
    3. China National Oil and Gas Exploration and Development Company Ltd., Beijing 100034, China
  • Received:2020-01-20 Revised:2020-03-11 Online:2020-10-01 Published:2020-08-08

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Abstract: In order to study the hydrocarbon accumulation models and exploration potential of the near-source Cretaceous in the lower assemblage of Melut Basin,the petroleum geological analyses of Cretaceous,such as identification of favorable reservoir-caprock assemblage,anatomy of key oil reservoirs,establishment of typical oil reservoir models and analysis of exploration potential, were carried out. The results show that:(1)Three sets of reservoircaprock assemblage were developed in the near-source Cretaceous, including interbedded reservoir-caprock assemblage of sandstones and mudstones in above-source Galhak Formation,inner-generation and inner-accumulation reservoir-caprock assemblage of Al Renk Formation,and upper-generation and lower-accumulation reservoircaprock assemblage of Al Renk and Al Gayger formations.(2)The flooding mudstones are the main controlling factor for the hydrocarbon accumulation of the inner reservoir-caprock assemblage of Galhak Formation,and the inner front of braided river delta is the favorable sedimentary facies for the development of high-production faulted blocks,with thick distributary channel sandstones and thick flooding mudstones.(3)The antithetic faulted blocks of Al Gayger Formation have good oil-source and lateral sealing conditions,and the antithetic faulted blocks with big fault throw in the slope are the preferred drilling targets.(4)The sedimentary facies determine the types and distribution of oil reservoirs in the fans,and the root and middle parts of the fans develop thick sandstones with good physical properties,which are the favorable zones for the development of high-production faultblock and fault-lithological reservoirs.(5)The exploration of the main producing layers in far-source Paleogene gets more and more difficult,and the near-source Cretaceous formations are the important targets for deepening exploration in the mature Northern Sub-basin.(6)The sub-basins in the south Melut Basin have small areas and coarse sediment infillings,which makes the regional caprocks of Adar Formation get worse,and the far-source Paleogene Samma,Yabus and Adar Formations not be favorable reservoir-caprock assemblage. The near-source Cretaceous formations have good accumulation conditions,and are the major exploration formations in the south Melut Basin. The research results have certain guiding significance for the fine exploration in the mature north Melut Basin and regional exploration of Cretaceous in the low-level south Melut Basin.

Key words: accumulation model, far-source, near-source, Cretaceous, Melut Basin, South Sudan

CLC Number: 

  • TE122.1
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