采动影响稳定区煤层气资源量分源叠加评估模型

Divided resource overlay evaluation model of coalbed methane resource quantity in mining affected stable block

为了构建一套完整可行的采动影响稳定区煤层气资源量估算方法,首先从煤层采动影响的角度,阐述了采动影响稳定区和采动影响稳定区煤层气的概念,分析了煤层气主要来源。在此基础上,忽略采动影响稳定区内部水溶态煤层气以及假定不发生煤层气泄露式逸散为前提,利用来源分析法和体积计算法构建出单一煤层条件和煤层群条件的采动稳定区煤层气资源量分源叠加估算模型,并进一步提出估算模型的现场适用条件判别公式。该估算模型的关键参数包括:残留煤炭资源量、残留煤炭煤层含气量、煤层气体积分数和孔隙总体积,在总结前人研究成果的基础上,提炼出各参数的取值方法或计算公式,保证了评估方法的完整性和可操作性。

In order to establish a set completed feasible estimation method of coalbed methane resource quantity, first from a view of seam mining influence, the paper stated conceptions of mining affected stable block and coalbed methane in mining affected stable block and analyzed the main resources of eoalbed methane. Based on the circumstances, a neglect of internal water soluble coalbed methane in mining affected stable block and assuming that on the premise of no coalbed methane leakage type dissipation occurred, a source analysis and volume calculation method were applied to establish a divided source overlay estimation model of coalbed methane resource quantity in mining table block with single seam condition and seam group condition. And a site suitable condition judgement formula of estimation model was further provided. The key parameters of estimation model were including a residual coal resource quantity, coalbed methane content of residual coal, eoalbed methane volume fraction and total pore volume. A value picking method or calculation formula of each parameter was provided and the integrity and operability of evaluation method could be ensured.