Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 38-46.doi: 10.3969/j.issn.1673-8926.2017.04.005

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Characteristics and controlling factors of tight sandstone and shale reservoirs of the fifth member of Xujiahe Formation in the Western Sichuan Depression

SHI Hongliang1,2, YANG Keming2, WANG Tong2   

  1. 1. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China;
    2. Research Institute of Exploration and Development, Southwest Oil and Gas Company, Sinopec, Chengdu 610000, China
  • Received:2016-12-06 Revised:2017-02-15 Online:2017-07-21 Published:2017-07-21

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Abstract: The exploration of nonmarine unconventional tight gas is still in the early stage. In order to explore the research methods of tight gas in nonmarine shale sequence,the data of cores,cast thin sections, scanning electron microscope, X-ray diffraction and mercury injection,were used to study the petrology,reservoir space, physical properties and main controlling factors of the fifth member of Xujiahe Formation in the Western Sichuan Depression. The results show that the lithology was composed of three types:shale(56%),siltstone(25%)and fine sandstone(19%). There are high content of matrix and debris, low content of feldspar in sandstone,and high content of quartz mineral in shale. The reservoir spaces include organic pores,mixed matrix pores and intragranular dissolved pores,intergranular dissolved pores and microfractures. The average porosity and permeability of sandstone are 1.41% and 0.1 mD,respectively,so it belongs to tight sandstone reservoir,and mainly in high power subaqueous distributary channel. The average porosity and permeability of siltstone are 1.41% and 0.1 mD,respectively,and the average porosity and permeability of shale reservoir are 1.95% and 0.068 mD,respectively. The reservoir properties are mainly controlled by deposition conditions, diagenesis and structural fracture. Strong compaction and pressure dissolution are the main factors leading to the tightness of sandstone. Secondary pores are mainly formed by dissolution. The transformation of clay minerals and the thermal evolution of organic matter provide a large amount of reservoir spaces for shale,and microfracture greatly improves the reservoir permeability. The results can provide a reference for tight gas exploration in this area.

Key words: stratigraphic-lithologic reservoirs, exploration thought, exploration discovery, exploration prospects, Erlian Basin

CLC Number: 

  • TE122.2
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