王营井田地下水与煤层气赋存运移的关系

RELATION BETWEEN OCCURRENCE OF GROUNDWATER AND MIGRATION OF COALBED METHANE IN WANGYING MINE FIELD

王营井田为深埋藏的向斜蓄水构造，由于裂隙含水带及岩墙隔水带发育，构成３个特征不同的水文地质单元．地下水以大气降水补给为主，垂直方式径流，侧向径流不显著；未开采状态下，排泄微弱，地下水为静储量．井田内煤层气赋存状态受地下水静、动平衡状态的严格控制．导水与汇水构造、阻水构造和蓄水与储水构造对煤层气赋存分别起着运移逸散、侵占与封闭作用．

Wangying Mine Field is a synclinal water retaining structure buried at great depths. There are three different hydrogeological units in response to the well developed fractured aquifer zones and the dike aquiclude zones. The groundwater is recharged mainly by meteoric water, vertical runoff with no obvious lateral recharge. The state of groundwater is like a static reservoir due to little discharge under natural state prior to coal extraction. The behavior of coal bed methane in Wangying Mine Field is controlled by the static and dynamic balance of groundwater. The water diverting, water collecting, waterblocking, and water retaining structures will control migration, emission, aggression and sealingoff of gas respectively.