煤矿区地面煤层气抽采效果评价方法探讨——以寺河煤矿某区块为例

Evaluation method of coalbed methane surface drainage effect in coal mines ——Take a block of Sihe mine as an example

评价煤矿区地面煤层气抽采的效果,可为煤层气后续开发和矿井开采设计提供技术依据。通过分析目前地面煤层气抽采效果评价现状,结合煤层气资源开发和煤矿安全生产对煤层气抽采效果评价的需要,提出了以煤层气含量降低率和煤层剩余气含量作为评价指标、以煤储层地质条件相近为评价单元划分原则,并在评价单元内实施一定数量检测井实测煤层剩余气含量的煤矿区地面煤层气抽采效果检测与评价方法。在煤储层地质条件划分的前提下,还提出了以煤层气含量降低率和煤层剩余气含量结果为划分依据的煤矿区地面煤层气抽采效果分级方法供探讨。该方法在晋城寺河矿某区块的应用,一定程度上证明了该套煤矿区地面煤层气抽采效果评价方法的合理性和可操作性。

CBM surface exploitation in coal mining area is not only makes use of CBM as a clean energy, but also reduces the risk of coal mine gas accident. Evaluation of CBM surface drainage effect in coal mining area would provides the technical basis for the subsequent CBM development and mining design. Based on the analysis of the surface CBM drainage effect evaluation status, combined with CBM resources development and the coal mine safety, the testing detection and evaluation method of CBM surface drainage effect in coal mining area was proposed,which takes the reduction rate of CBM content and the residual gas content as evaluation indexes, the similar geological conditions of coal reservoir as classification principle of evaluation unit. Under the premise of the classification of the geological conditions of coal reservoir, the classification method of the CBM drainage effect in coal mining area, which is based on the reduction rate of CBM content and residual CBM content, was put forward too. The application of this method in a block of Sihe mine, Jincheng, to a certain extent, proved the rationality and operability of the evaluation method of surface CBM extraction efficiency.