煤层气储层异常压力的成因机理及受控因素

The formation mechanisms of abnormal pressure and factor in control of the coalbed gas in Qinshui basin

在煤层气储层压力的内部和外部成因分析的基础上,重点从生烃条件、保存及封盖条件、水动力条件3方面分析了煤储层异常压力的形成机理及控制因素.根据沁水盆地煤炭开采阶段收集的大量地层压力资料,研究了影响该地区煤层气储层异常压力的主要控制因素及其时空匹配,分析了压力封闭和泄露的地质条件,重点对沁水盆地的异常压力的成压机理进行了探讨,得出造成沁水地区异常低压的主要原因是生烃作用停止以及构造抬升造成煤层气大量逸散.

Based on the analysis coalbed pressure inner part and exterior formation reason, the formation mechanisms of abnormal pressure and factor in control of the coalbed gas were analyzed which the coalbed condition,keep and cover condition, and motive of water condition, To the much of collection Qinshui basin formation pressure data from exploitation stage, studied factors in main control of the coal bed gas abnormal pressure and accouplement time space, analyzed pressure envelop and leak geologic condition, emphasis approached for the formation mechanisms of abnormal pressure of Qinshui basin. The result in Qinshui basin abnormal low-pressare main reason is living the hydrocarbon function stoped and the structure lift to rise caused coalbed gas a great deal of lost.