Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 82-92.doi: 10.12108/yxyqc.20200308

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Formation mechanism of high-quality sandy-conglomerate reservoir of Triassic Karamay Formation in Mahu area

XU Ziyu1, WANG An2, HAN Changcheng1, TIAN Jijun1, ZHANG Junsheng1, LIU Lei1, ZHANG Nan1   

  1. 1. College of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China;
    2. North China Business Department of Well Logging Co., Ltd., CNPC, Renqiu 062550, Hebei, China
  • Received:2019-09-19 Revised:2019-10-23 Online:2020-05-21 Published:2020-04-30

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Abstract: In order to clarify the formation mechanism of high-quality sandy-conglomerate reservoir of Triassic Karamay Formation in Mahu area of Junggar Basin,core observation,thin section identification,logging data analysis,mercury injection and physical property measurement and scanning electron microscope analysis were carried out,meanwhile the plane distribution and diagenetic evolution of high-quality reservoir were studied comprehensively. The results show that:(1) The Karamay Formation in Mahu area is mainly composed of braided river delta facies and fan delta facies,in which distributary channel conglomerates,dam bodies and sheet sands are the main reservoirs.(2) Three kinds of reservoirs are superposed with each other. The underwater distributary channel sands in delta front subfacies develop truncated river channel sand body and multiple sedimentary composite sand body,with the largest reservoir thickness,the coarsest grain size and the best reservoir properties, while sheet sand is mainly siltstone,with thin reservoir thickness,fine grain size and relatively poor reservoir properties.(3) Diagenetic environment has a certain control over the evolution of reservoir pores. The chlorite precipitation and calcite cementation in the late diagenetic stage reduced the reservoir physical properties,thus forming the present low porosity and ultra-low permeability reservoir. The research results have guiding significance for oil and gas exploration of Karamay Formation in Mahu area.

Key words: sandy-conglomerate reservoir, sedimentary distribution, diagenetic environment, high-quality reservoir, Triassic, Mahu area

CLC Number: 

  • TE122
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