采动影响稳定区煤层气储层空间计算方法

通过分析采动稳定区覆岩移动相似模拟试验数据,发现采动稳定围岩区卸压范围包括过渡卸压区域和有效卸压区域两部分,其中有效卸压区域也就是采动稳定区煤层气的储层空间。在此基础上,分别对采空区顶底板裂隙带的高度及范围进行了分析,总结出采动稳定区围岩有效卸压范围的确定方法及计算公式,为采空区可抽采煤层气资源储量评估及其邻近煤层原始瓦斯参数有效测定范围的确定提供了依据。

Calculation Method of Coal-bed Methane Reservoir Space in Stable Mining-affected Region

Through the analysis on the data obtained from the similarity simulation tests of the overburden rock movement in the stable mining-affected region,it was found that the pressure relief range of the stable mining-affected surrounding rock region was composed of the transitive pressure relief region and effective pressure relief region,and the effective pressure relief region was just the methane reservoir space in the stable mining-affected region.On this basis,analysis was carried out respectively on the height and range of both the roof and floor fracture zones in the gob,and the determination method and calculation formula for the effective pressure relief range of the stable mining-affected surrounding rock were summarized,all of these provided the basis for the estimation of the coal-bed methane reserves in the gob and the determination of the effective detection range of the original gas parameters in its adjacent coal seam.