综合勘探技术在采空区探测中的应用

Application of Integrated Prospecting Technology in Gob Detection

以某整合矿井为例,提出了地面与井下物探相结合方法,即:首先通过三维地震勘探圈定采空区分布,在此基础上选择某一采空区作为地面瞬变电磁法工作区,验证采空区的含水性,最后通过井下瞬变电磁法及钻探实现对异常区域的精确定位。某采空区探测实例表明:三维地震勘探方法对地层连续信息反映明显,可较好的确定采空区的位置及深度,但对富水性无法解释;瞬变电磁法对低阻异常灵敏,可准确反映含水异常的范围;井瞬变电磁法及钻探因离异常距离较近,可更好的获得地层信息,对异常位置的确定更为可靠。

Taking an integrated coalmine as example, put forward a combined surface and underground geophysical prospecting method. That is, firstly through 3D seismic prospecting to delineate gobs distribution, then select one of the gobs to carry out surface transient electromagnetic prospecting（TEM） to verify and determine its water bearing property, finally through underground TEM and drilling to accurately position abnormal region. A case study of a gob detection has shown that 3D seismic prospecting can obviously reflect strata continuity, preferably determine gob position and depth, but cannot interpret water yield property; TEM responds well to low-resistivity anomaly, can accurately reflect range of water bearing anomaly; while underground TEM and drilling because of nearer anomalies can obtain strata information better, thus more reliable to determine anomaly position.