| Citation: |
LI Xin，CHEN Zhenlong，GUO Tao，et al. Geological condition assessment and selection of optimal favorable areas for deep underground coal gasification in the Yanchuannan block[J]. Coal Geology & Exploration，2025，53(2)：44−54. DOI: 10.12363/issn.1001-1986.24.11.0676
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Geological condition assessment for underground coal gasification (UCG) allows for considerably reducing the risk of UCG projects, while scientific siting serves as a prerequisite for the success of UCG projects. To achieve the geological condition assessment for deep UCG and the selection of optimal favorable areas in the Yanchuannan block, this study quantified the indices of coal quality, coal seam occurrence, surrounding rocks, hydrogeology, and structures in the No.2 coal seam in the study area. Employing the technique for order preference by similarity to an ideal solution (TOPSIS) method, this study performed mathematical assessments and grading of various exploitation units. Finally, this study obtained comprehensive assessment results of favorable, relatively favorable, and potentially favorable areas for UCG.
The results indicate that the No.2 coal seam in the study area was formed in a sedimentary environment of the delta plain facies. This coal seam consists primarily of medium-rank coals, including coking, lean, and meagre coals, exhibiting low average moisture and low average ash contents and a high yield of volatile constituents. In terms of sulfur content, the No.2 coal seam contains low- to high-sulfur coals. Furthermore, the No.2 coal seam manifests a considerable thickness, high stability, a low average gangue layer number, and low gangue coefficients (i.e., the ratio of the total gangue thickness to the total coal seam thickness), and simple structures, suggesting a stable moderately thick to thick coal seam with a relatively complete coal structure. The roof and floor of the No.2 coal seam are dominated by mudstones, and its surrounding rocks show high values of the comprehensive lithological index and high sealing performance. Faults in the coal seam exhibit moderate fractal dimension values overall, suggesting simple fault development and favorable conditions for exploitation. The study area exhibits surface water locally, with moderate hydrological fractal dimension values and high groundwater sealing coefficients.
Overall, the No.2 coal seam in the study area exhibits resource and geological conditions suitable for the implementation of UCG projects. Based on the distribution characteristics of structures, burial depths, rivers, and mine boundaries, as well as the description of geological exploration data, the No.2 coal seam can be divided into 11 exploitation units, with favorable areas for UCG primarily distributed in the northern part. Specifically, the most favorable areas consist of units Ⅴ and Ⅲ in the north-central part, the relatively favorable areas include units Ⅰ, Ⅱ, Ⅳ, Ⅵ, Ⅶ, Ⅸ, and Ⅹ, and potentially favorable areas comprise units Ⅷ and Ⅺ.
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