Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 115-123.doi: 10.12108/yxyqc.20190213

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Characteristics and main controlling factors of tight sandstone reservoir of Ahe Formation in northern Kuqa Depression

WANG Huachao1, HAN Denglin1, OUYANG Chuanxiang2, ZHOU Jiayi1, WANG Qianqian1, MA Li2   

  1. 1. College of Geosciences, Yangtze University, Wuhan 430100, China;
    2. College of Petroleum Engineering, Yangtze University, Wuhan 430100, China
  • Received:2018-10-14 Revised:2019-01-17 Online:2019-03-21 Published:2019-03-21

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Abstract: In order to reveal the genesis and distribution of micropores in the Lower Jurassic tight sandstone reservoirs in Kuqa Depression,the reservoir characteristics of Ahe Formation in northern tectonic belt were studied by means of thin section analysis,scanning electron microscopy,X-ray diffraction,micro-CT scanning and laser confocal microscopy. The results show that micropores occur in plastic minerals,and their development in the plane and vertical direction is obviously restricted by the compaction effect of intervals. Tectonic stress and burial depth are the main factors affecting the plane compaction effect,and shale content is the main factor affecting the vertical compaction effect. The micropores of the tight sandstone of Ahe Formation are composed of intercrystalline micro-pores of clay minerals and weak dissolved pores in muddy matrix. Controlled by shale content,burial depth and tectonic stress,micropores are mainly developed in the second section of Ahe Formation with low shale content,and distributed in Yinan 4 well area with shallow burial depth and small tectonic stress. This is of great significance for the formation of deep tight gas reservoirs.

Key words: tight sandstone, micropore, main controlling factor, Ahe Formation, Kuqa Depression

CLC Number: 

  • TE357
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