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Comparative study on porosity and permeability in net confining stress of three natural gases in coal series reservoirs in Guxian County，Qinshui Basin

Cheng Ming，Fu Xue-hai，Zhang Miao，Cheng Wei-ping，Qu Li-zhen   

  1. 1.School of Resource and Earth Science，China University of Mining and Technology，Ministry of Education Key Laboratory of Coalbed Methane Resources and Reservoirs，Xuzhou 221116，China;
    2.Shanxi Provincial Research Institute of Geology and Mineral Resources，Taiyuan 030001，China
  • Received:2018-04-03 Revised:2018-05-23 Online:2018-08-10 Published:2018-08-10

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Abstract: In order to reveal the characteristics of the difference in porosity and permeability of coal，shales and tight sandstones in coal series，2 coal samples，2 shale samples，and 4 sandstone samples were collected from the Guxian County，Qinshui Basin，Shanxi Province，and a comparative study of the net confining stress permeability was conducted.The results show that the porosity and permeability of three natural gases in coal series reservoirs increase exponentially with the increase of effective stress，and the ratio of porosity compressibility of coal reservoirs，shale reservoirs and sandstone reservoirs is 1∶1∶0.58，the permeability attenuation coefficient ratio is 1∶0.73∶0.78.The porosity and permeability stress damage rate of three natural gas reservoir increase with the increase of effective stress in the form of two-stage，and the effective stress is <4MPa.The porosity and permeability damage rate of three natural gases reservoir both follow the effective stress.The increase shows a rapid upward trend with an effective stress of >4MPa.With the increase of effective stress，the growing rate is gradually stable，and the stress sensitivity of coal reservoirs，shale reservoirs，and sandstone reservoirs decreases sequentially.The research results have theoretical and practical significance for the co-examination of the three natural gases in coal series.

Key words: Three natural gases in coal series reservoirs, Net confining stress, Porosity, Permeability, Stress sensitivity

CLC Number: 

  • TE135

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