Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (4): 959-969.doi: 10.13278/j.cnki.jjuese.20180024

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Reservoir Characteristics and Main Controlling Factors of Tight Sandstone in Coal Measures in Zijinshan Area

Sun Zefei1,2, Shi Jianru1, Lian Bipeng2, Kang Zhishuai1, Shen Jian3, Yang Han1,2   

  1. 1. Shanxi Geology and Mineral Resources of Science and Technology Evaluation Center, Taiyuan 030024, China;
    2. Oil and Gas Resources Development and Management Department, Department of Natural Resources of Shanxi Province, Taiyuan 030024, China;
    3. Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process(China University of Mining & Technology), Ministry of Education, Xuzhou 221008, Jiangsu, China
  • Received:2018-05-16 Online:2019-07-26 Published:2019-07-26
  • Supported by:
    Supported byNational Science and Technology Major Project (2011ZX0503-01-02) and National Natural Science Foundation of China (U1361207)

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Abstract: The Upper Paleozoic tight sandstone gas resources are rich in potential in Zijinshan area at the northeast margin of Ordos basin,and are one of the important blocks for unconventional natural gas exploration in China. The petrology, physical properties and gas-bearing characteristics of tight reservoirs were studied through analysis and test of casting thin sections, scanning electron microscope, experiments on porosity,permeability,and pressured-mercury testing,combined with drilling and logging data. The results show that lithic sandstone is the main reservoir rock type at medium degree of composition maturity and textural maturity with high content of quartz,lithic fragment,and low content of feldspar. The dissolved pore is the major type of reservoir space,and its main pore structure is mesoporous fine throat and microporous fine throat. The porosity of the major pores ranges from 2.00% to 12.00%, with an average of 6.96%,and the main permeability is 0.01×10-3 μm2-1.00×10-3 μm2, with an average of 0.36×10-3 μm2. The correlation of porosity and permeability is good because of the later dissolution. The average thickness of the gas reservoirs with gas saturation of 40.4% is 10.3 m, which accounts for 29% of the tight sandstone reservoirs. The reservoir development is mainly under the control of sedimentation, compaction and dissolution. The material basis and spatial distribution of reservoir formation are controlled by sedimentation. The strength of compaction is directly affected by rock composition in different sedimentary environments. The superimposed development characteristics of sandstone, mudstone, limestone,and coal seam provide a basis for dissolution. Compaction is the main factor that causes reservoir tightness. Dissolution is the decisive factor for the improvement of reservoir properties in the region. The thermal action and eruption of Zijinshan magma enhanced the dissolution.

Key words: tight sandstone, reservoir, main controlling factors, Taiyuan Formation, Shanxi Formation, Zijinshan, Ordos basin

CLC Number: 

  • P618.13
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