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

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 coalbed methane. Based on th e 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 qu_ antity 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,coalbed methane volume fraction and to tal 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.