Reservoir Evaluation and Development ›› 2022, Vol. 12 ›› Issue (2): 292-301.doi: 10.13809/j.cnki.cn32-1825/te.2022.02.004

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Sedimentary micro-facies and gas bearing property of He2+3 Member in Shiguhao gas area, northern margin of Ordos Basin

GAO Zhaopu()   

  1. Exploration and Development Research Institute, Sinopec North China Oil and Gas Company, Zhengzhou, Henan 450006, China
  • Received:2021-09-09 Online:2022-05-07 Published:2022-04-26

Abstract:

Taking He2+3 Member in shiguhao gas area of Dongsheng gas field as the research object, the types and plane distribution of sedimentary facies in this area have been described, and the relation between sedimentary microfacies and natural gas distribution has been studied. Due to the influence of complex paleogeomorphic characteristics on the sedimentary system distribution, the transportation channel of sedimentary debris and the distribution space of sedimentary system mainly is defined by the description of paleogeomorphology. On the basis of core observation, 14 lithofacies types and 5 lithofacies associations are summarized, and three sedimentary microfacies of channel bar, braided channel and river flood deposition are identified in He2+3 Member. The vertical sedimentary sequence of typical wells is analyzed, which is dominated by the normal grain sequence with coarse grain size, forming a single-stage large set of thick gravelly medium-coarse sandstone. The vertical and plane distribution characteristics of braided river sedimentary facies are characterized. The sand body is distributed in a nearly north-south strip, and the river channel migrates and swings frequently laterally. Combined with the reservoir physical parameters, the influence of different microfacies on reservoir physical properties is summarized, the distribution of gas-bearing reservoirs in sedimentary microfacies is analyzed, and finally the braided river channel bar is proved to have good physical properties and gas-bearing properties, which has great natural gas development potential.

Key words: paleogeomorphic, lithofacies, sedimentary sequence, sedimentary micro-facies, gas-bearing property

CLC Number: 

  • TE122