Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 37-44.doi: 10.12108/yxyqc.20180605

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Depositional models and lithologic reservoir exploration of sandy beach-bar around buried-hill: a case from Galhak Formation in Ruman region of Melut Basin, South Sudan

CHEN Bintao1,2, SHI Zhongsheng1, XUE Luo1, MA Lun1, ZHAO Yanjun3, HE Weiwei1, WANG Lei1, SHI Jianglong1   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. Key Laboratory of Reservoir Description, CNPC, Lanzhou 730020, China;
    3. CNPC International Nile Limited, Khartoum 10687, Sudan
  • Received:2018-04-17 Revised:2018-09-20 Online:2018-11-16 Published:2018-11-16

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Abstract: After almost 20 years' exploration, only a few structural traps were left for drilling in Melut Basin, South Sudan. Exploration for new areas such as lithologic reservoirs is needed to tackle the reserve and production decline. Based on analysis of palaeogeomorphic reconstruction, provenance system, mico-facies in single well, sandbodies distribution and investigation of modern deposition in Qinghai Lake, large-scale sandy beach-bars were discovered in Cretaceous Galhak Formation around Ruman buried-hill in Melut Basin. Two depositional models of buried-hill periphery and underwater buried-hill platform were built, and high energy shore and shallow lake environment caused by buried-hill topography located beside the long axis delta was considered as the main controlling factor of sandy beach-bar deposition. In the initial stage of Galhak Formation deposition, Ruman buried hill exposed for a short duration because of intense tilting of faults, where large scale of sandy bar was developed with an area of 10 km2 and a thickness of 10-20 m, the sediment source was provided by basement and long-axis delta. Ruman burial hill was sinking into the water as the relative lake level rising, sandy beach-bars of underwater buried hill platform (dominated by large area of thin layer beach-sand with thick bar-sand in local)were developed, the sediments source was supplied by long-axis delta. Beach-bar sandbodies, up-dipping pinched-out boundary, underlying source rock of Renk Formation, flooding mudstone in the top and lateral lacustrine mudstone seal were matched to form lithological traps. The discovery of sandy beach-bar guided the lithologic reservoir exploration effectively, several exploratory wells that were deployed on the basis of "beach bar" were succeeded, promoting the reserve scale of Ruman area.

Key words: Melut Basin, Ruman subbasin, sandy beach-bar, depositional model, Qinghai Lake modern sediments

CLC Number: 

  • TE122.2
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