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通过研究韩城矿区的煤体结构分布图以及矿区产气井的排采曲线,从单采井和合采井等不同角度综合分析了不同煤体结构对煤层气排采的作用。研究表明:原生煤结构致密、孔隙率低,内部绝大部分层理和割理为胶结闭合状态,原生煤储层不是煤层气开发的有利区域;碎裂煤内部裂隙广泛发育,张开度和连通性较好,包含碎裂煤的含气储层是煤层气开发的首选区域。
By studying the distribution of coal body structure in Hancheng mining area and the production curve of gas production wells in the mining area, the effects of different coal body structures on the CBM production are comprehensively analyzed from different perspectives, such as single production well and combined production recovery. The results show that the primary coal has a dense structure with low porosity, most of the strata and cuttings are cemented closed, and the primary coal reservoir is not a favorable area for CBM development. The fractures within the fractured coal are widely developed, with openness and connectivity Preferably, gas-bearing reservoirs containing fractured coal are the preferred areas for CBM development.