Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 67-77.doi: 10.12108/yxyqc.20200207

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Geological conditions and exploration potential of shallow oil and gas in slope area of Mahu Sag,Junggar Basin

HU Xiao1, QU Yongqiang2, HU Suyun3, PAN Jianguo2, YIN Lu2, XU Duonian2, TENG Tuanyu2, WANG Bin2   

  1. 1. School of Geosciences, Yangtze University, Wuhan 430100, China;
    2. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
  • Received:2019-07-03 Revised:2019-09-03 Online:2020-03-21 Published:2020-01-19

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Abstract: Shallow layer(T2 k-J)in the slope area of Mahu Sag in Junggar Basin has great exploration potential. In order to study the geological conditions of oil and gas and the distribution law of favorable area for reservoir formation,a large number of analyses of mud-logging,wire-logging and core data were carried out. Based on 3D seismic data interpretation,the shallow layers in the slope area were comprehensively evaluated. The results show that:(1)The reservoirs of Karamay Formation,Baijiantan Formation,Badaowan Formation and Sangonghe Formation in the slope area of Mahu Sag are characterized by large scale,shallow burial,good physical properties,and have the conditions to form lithologic reservoirs with cluster distribution.(2)The reservoir cap assemblage in the study area is well configured and vertically overlapped,which lays a good reservoir cap assemblage condition for lithologic reservoirs with cluster distribution.(3)The development of faults in the slope area provides a good oil-gas migration channel for shallow reservoirs in the slope area.(4)Fault blocks or fault lithologic traps in the study area have the characteristics of cluster distribution,and they are overlapped and contiguous in space,with superior conditions for trap forming. The shallow and deep oil and gas enrichment zones are characterized by "relay accumulation" and have certain inheritance. The research results have a guiding role for shallow exploration in the slope area of Mahu Sag.

Key words: shallow layer, cluster distribution, exploration potential, Mahu Sag, Junggar Basin

CLC Number: 

  • TE121.1
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