Mine Safety Technology Branch,China Coal Research Institute National Key Lab of Coal Resource High Efficient Mining and Clean Utilization

基于煤层气地质理论和构造逐级控制理论,选取平煤矿区局部构造为研究对象,分析了特定构造控制下的煤层气赋存特征和运移规律。研究发现,深部断层对于缓解向斜的构造应力作用显著,断层面的应力状态决定了局部应力集中程度,而储层气体临界解吸压力和地下水条件制约了煤层气的赋存状态和运移能力。分析平煤十三矿的部分煤层气井的产量发现,断层封闭系数If>4.5时,储层压力梯度较大,局部渗透率偏低,但煤层气排采产量较高;沿主应力方向裂隙发育的区带,储层渗透率差异较大,其运移能力受储层煤层气赋存状态控制;构造复合作用下的储层封闭能力决定了该区域煤层气的资源丰度和运移规律。

Based on the coalbed methane geological theory and the tectonic gradual control theory,a local tectonic of Pingdingshan Mining Area was selected as a study object and the calbed methane deposition features and migration law under the certain fectonic control were analyzed. The study showed that the deep depth fault would have an obvious role to release the syneline tectonic stress,thestress status of the faut surface determined the local stress concentration degree,and the c rtical desorption pressure of the reservoir gas and the underground water condition restricted the coalbed methane deposition status and migration capacity. The analysis on the yield of some coalbed methane wells in No.13 Mine of Pingdingshan Mining area showed that when the tectonic closed coefficient lf 4.5,the pressure gradient of reservoir would be high.,the local permeability would be low,but the coalbed methane drainage yield would be high. In the crack developed zone along the major stress direction,the difference between the reservoir permeability would be high and the migration capacity was contrlled by coalbed methane depostion status of the reservoir.Under the tectonic complex role,the closed capacity of the reservoir determined the resources abundance and the migration law ofthe regional coalbed methane.

国家自然科学基金青年基金资助项目(51504137)；山西省煤层气联合基金资助项目(2013012007)；