Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (4): 37-45.doi: 10.12108/yxyqc.20180404

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Lithologic reservoir forming conditions and its exploration implication in northern Melut Basin,South Sudan

WANG Guolin1, SHI Zhongsheng2, ZHAO Yanjun1, CHEN Bintao2, XUE Luo2   

  1. 1. CNPC International Nile Limited, Khartoum 10687, Sudan;
    2. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2017-11-25 Revised:2018-03-28 Online:2018-07-21 Published:2018-07-21

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Abstract: After more than ten years of exploration in northern Melut Basin,the remaining structural traps are limited and small,which is difficult to meet the exploration demands,and the exploration field should be transferred to the field of lithologic reservoir. With wire-logging,mud-logging and coring data from near 200 exploration wells and more 4 000 km2 3D data,the source rock evaluation,sedimentary facies and fault features were researched,the results show that:firstly,the northern Melut Basin consists of Jamous,Abyat,Moleeta and Ruman depressions acting as four active oil kitchens and presents sufficient oil source. Secondly,interbedded sandstone and mudstone of delta front developed in Cretaceous Galhak Formation and Tertiary Yabus Formation,which is favor-able to form lithological traps. Thirdly,faults could enhance the oil charging for Galhak Formation as insource reservoir and act as migration pathway for upper member of Yabus Formation as above-source reservoir. The research shows that northern Melut Basin has the geologic conditions for forming lithologic reservoirs and guides a series of exploration discoveries of lithologic reservoirs,such as up-dip pinchout lithologic reservoir of Galhak Formation in Ruman area and structural-lithologic composite reservoir of Yabus Formation in Gasab area, which strongly promotes the exploration and deployment of lithologic reservoirs in northern Melut Basin.

Key words: flow unit, tight sandstone gas, permeability, NMR log, Swanson parameter, Xujiahe Formation, Sichuan Basin

CLC Number: 

  • TE121.3
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