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通过对铁法矿区煤层顶底板岩性及其封闭性能、后期改造、水文地质条件及岩浆侵入等几方面的分析,系统探讨了铁法矿区煤层气的保存条件。分析认为:①研究区煤层厚度、埋深、含气量、水文地质特征总体上受断陷盆地的控制;②喜山期岩浆直接侵入到煤层或煤层底板,使煤的变质程度普遍增加,煤的含气量增大;③煤层围岩的差异性、后期改造及岩浆侵入等是造成本区含气非均质性的主要原因。最后指出:研究区南部的大兴井田和大隆井田是煤层气保存较好的地区。
Based on the analysis of lithology, sealing performance, later alteration, hydrogeological conditions and magma intrusion in coal seam top and bottom of Tiefa Mining Area, the conditions of CBM storage in Tiefa Mining Area are systematically discussed. The analysis shows that: ①The seam thickness, burial depth, gas content and hydrogeological features are generally controlled by fault basins in the study area; ② The magma in the Himalayan period directly intrudes into the coal seam or seam floor, so that the degree of coal metamorphism generally increases, The gas content increases; (3) The differences of surrounding rock in coal seams, later alteration and magma intrusion are the main causes of gas-bearing heterogeneity in this area. Finally, it is pointed out that the Daxing minefield and Dalong minefield in the southern part of the study area are the areas where CBM is well conserved.