Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (6): 54-59.doi: 10.3969/j.issn.1673-8926.2012.06.010

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Characteristics of glutenite reservoir of Permian Upper Wuerhe Formation in Zhongguai-Wuba area in the northwestern margin of Junggar Basin

LU Xinchuan1， SHI Ji’an1, GE Bing2， ZHANG Shuncun1   

  1. 1. Key Laboratory of Petroleum Resources Research， Institute of Geology and Geophysics， Chinese Academy of Sciences， Lanzhou 730000， China； 2. Jinke Engineering Supervision Limited Liability Company， Karamay 834004， China
  • Online:2012-12-20 Published:2012-12-20

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Abstract:

Based on the data of cores, thin sections, scanning electron microscope and energy spectrum analysis, combined with the principles and methods of sedimentology, this paper studied the glutenite reservoir of Permian Upper Wuerhe Formation in Zhongguai-Wuba area in the northwestern margin of Junggar Basin. The result shows that the glutenite reservoir is mainly developed in multi-alluvial fan facies with “composite fan” sedimentary sequences, which can be further divided into fan-root, fan-bosom and fan-edge subfacies. Glutenite reservoir is mainly consisted of conglomerate, gravel, sandy conglomerate and conglomeratic coarse sandstone, and also contains a few sandstone and fine sandstone. The gravels in conglomerate are mainly tuff and andesite. Reservoir diageneses are mainly compaction, cementation and dissolution, zeolite dissolution is constructive to the reservoir perperties, and diagenetic stage is mainly of late diagenetic stage A. The porosity ranges from 5% to 15%, and the average porosity is 9.4%. The permeability ranges from 0.08 to 80.00 mD, and the average permeability is 3.05 mD. On the whole, it belongs to the better-medium type reservoir.

Key words: reservoir characteristics, Triassic, Cheguai area, northwestern margin of Junggar Basin

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