School of Resources and Geoscience, China University of Mining and Technology College of Geology and Mining
Engineering, Xinjiang University Xinjiang Geology and Mineral Resources Bureau

为了有效地对煤层气排采期间水文地质动态变化规律进行监测,以潘庄区块为研究对象,利用瞬变电磁探测技术对3号煤层排采井PE-055附近的地下水进行探测,探讨垂直煤层气排采井地下水的运移规律。结果显示,煤层气井排采降压过程会使地下水的存储和水力联系发生动态变化,瞬变电磁探测技术能够较好监测地下水运移特征,表现为视电阻率和水力联系的同步变化具有较好的耦合性。在地下水连通性差的区域,排采后视电阻率具有升高趋势;而在地下水连通性较好区域,视电阻率明显降低;视电阻率的动态变化不仅反映储层改造前后的差异性,而且指示出煤层气井排采期间地下水的运移方向,试验结果为煤层气开发期间的地下水运移监测提供了新思路和技术。

In order to monitor hydrogeology dynamic change effectively and discuss the migration of groundwater during drainage, transient electromagnetic metho d ( TEM) was carried out to track and simulate the groundwater of No. 3 Coalbed near PE- 055 Well which was located in Panzhuang Block. The study found that dyna mic changes of hydraulic connection and the storage of groundwater were caused during the process of drainage. That synchronous change between apparent resistivit y and groundwater connectivity were highly coupled showed that TEM could monitor groundwater migration well. Apparent resistivity, reduced within certain range in the area of strong groundwater connectivity by comparison, would increase within different degree in the area of poor groundwater connectivity after drainage. The differenc es of reservoir between before and after drainage as well as instructions of groundwater migration direction were reflected by dynamic change of apparent resistivity, W hich provided new ideas and technologies for groundwater monitoring during CBM well's drainage.

国家重点基础研究发展计划(1973计划)资助项目(2009CB219605)；国家重大科技专项资助项目(2011ZX05034-004)；新疆维吾尔族自治区“天山学者”启动基金资助项目(11100213)；煤层气资源与成藏过程教育部重点实验室(中国矿业大学)开放基金资助项目(2012-004)；