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LI Honglei, GUO Zhijun, YI Tongsheng, QIN Yong, YANG Tongbao, JIN Jun. 2025. Enrichment mechanism, optimization and evaluation of favorable CBM areas in the Upper Permian of Northwest Guizhou[J]. Geology in China, 52(2): 597-612. doi: 10.12029/gc20220612002
Citation: LI Honglei, GUO Zhijun, YI Tongsheng, QIN Yong, YANG Tongbao, JIN Jun. 2025. Enrichment mechanism, optimization and evaluation of favorable CBM areas in the Upper Permian of Northwest Guizhou[J]. Geology in China, 52(2): 597-612. doi: 10.12029/gc20220612002
shu

Enrichment mechanism, optimization and evaluation of favorable CBM areas in the Upper Permian of Northwest Guizhou

  • 1.

    Coal Geology Bureau of Guizhou, Guiyang 550081, Guizhou, China

  • 2.

    Bonanza Precision Mining and Environmental Protection Guizhou Provincial Academician Expert Workstation, Guiyang 550081, Guizhou, China

  • 3.

    Guizhou Key Laboratory of Coal Fluidized Mining, Guiyang 550081, Guizhou, China

  • 4.

    Key Laboratory of Evaluation and Development of Unconventional Natural Gas in Complex Tectonic Area of Ministry of Natural Resources, Guiyang 550008, Guizhou, China

  • 5.

    Guizhou Institute of Petroleum Exploration and Development Engineering, Guiyang 550008, Guizhou, China

  • 6.

    China Univeraity of Mining and Technology, Xuzhou 221008, Jiangsu, China

    • Fund Project: Supported by Guizhou Provincial Geological Exploration Special Fund Project (No.208−9912−JBN−UTS0), Guizhou Provincial Scientific and Technological Program (No.ZDSYS[2023]002, No.KXJZ[2024]003).
More Information
  • Author Bio: LI Honglei, male, born in 1985, professor level senior engineer, mainly engaged in coal and CBM exploration research; E-mail: 303396581@qq.com
  • Corresponding author: GUO Zhijun, male, born in 1988, senior engineer, engaged in CBM exploration and development research; E-mail:352501017@qq.com. 
Received Date:  12 June 2022
Revised Date:  22 November 2022
Publish Date:  25 March 2025
    Abstract

  • This paper is the result of energy exploration engineering.

     Objective

    The primary goal is to identify and classify favorable areas for CBM exploration and development, providing a scientific basis for future exploration efforts in Guizhou Province.

    Methods

    Based on geological exploration data and laboratory sample analyses, key reservoir characteristics of the major coal seams (No. 6, No. 14, and No. 27) were systematically assessed. Parameters such as coal seam thickness, gas content, permeability, reservoir pressure, and coal−body structure were analyzed. Using a five−index evaluation method, 19 gas−bearing areas were classified.

    Results

    (1) The three major coal seams exhibit greater thickness in the southwest and thinner deposition toward the northeast. The average gas content is 11.73 m3/t, with gas accumulation primarily controlled by synclinal structures. (2) Seven extensive gas−bearing areas were identified, with the Bide−Santang Basin and the Jinlong−Qianxi−Jinsha syncline group exhibiting gas contents exceeding 16 m3/t. (3) The average well−tested permeability of the coal seams is 0.173 mD, indicating a medium−low permeability reservoir. Permeability decreases from west to east and with increasing depth, with significant variations across different seams. (4) The average reservoir pressure is 4.98 MPa, with an average pressure coefficient of 0.86, indicating a predominantly underpressured state. A transition from underpressure to normal and overpressure is observed from east to west. (5) Coal structural characteristics vary spatially, with primary and fragmented coal types dominant in the east, while granulated and pulverized coal types are more prevalent in the west.

    Conclusions

    Based on the evaluation, seven Grade I, eight Grade II, and four Grade III favorable CBM areas were identified. The Grade I areas, including the Tucheng, Yangmeishu, Dahebian, Shuigonghe, Bide, Zhitang, and northern Jinlong synclines, demonstrate significant CBM exploration and development potential. The Grade II areas include the Gemudi, Jinpen, Santang, northern Qianxi, Jinsha, Liuchang, and Molaoba synclines, while the remaining synclines are classified as Grade III.
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