Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (2): 418-430.doi: 10.13278/j.cnki.jjuese.201702108

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Reservoir Characteristics and Their Lithofacies Controlling Effect of Coal-Bearing Mudstone in Huainan Coal Field

Xu Hongjie1, Hu Baolin1, Zheng Jianbin1, Liu Huihu1, Zhang Wenyong2, Zheng Kaige1   

  1. 1. School of Earth Science and Environmental Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China;
    2. Anhui Bureau of Coal Geological Exploration, Hefei 230088, China
  • Received:2016-06-07 Online:2017-03-26 Published:2017-03-26
  • Supported by:
    Supported by the National Natural Science Foundation of China(41402140,41302129), Shale Gas Investigation Project of Anhui Province (2012-g-17) and Natural Science Foundation of Anhui Province (1408085QE88)

Abstract: Coal measure shale of marine-terrigenous facies is widely distributed with considerable natural gas resource potential. Taking the Carboniferous-Permian coal measures in Huainan coal field as an example, the mineralogical features, lithofacies characteristics and reservoir characteristics were tested by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the controlling effect on shale gas reservoir space of mudstone facies were analyzed. The results show that the mineral composition is dominantly clay minerals with few authigenic clay minerals. Five lithofacies, i. e. kaolinite mudstone with granophyric texture, light gray kaolinite mudstone, oolitic mudstone, dark mudstone and silty mudstone, were identified in the coal measure strata. Five types of reservoir macro-fracture spaces, including shearing fracture along bedding plane, abnormal pressure fracture for organic matter evolution, interlayer lamellation fracture, structural fracture, and micro-fracture with quartz and kaolinite, and some pore types as fossil pore, interparticle pore, intragranular pore, inter-crystalline pore and possible organic matter pore. There are different lithofacies types under different sedimentary environments, and it determines their mineral composition characteristics and the organic matter content, further determines the types of reservoir pore space, and controls the development of mudstone fracture.

Key words: coal-bearing shale gas, reservoir space, shale and mudstone, pore and fracture, Huainan coal field

CLC Number: 

  • TE122.2
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