瞬变电磁含水性评价技术在采空区煤层气地面抽采中的应用

Application of TEM Moisture Assessment Technology in Gob Area CBM Surface Drainage

为了研究运用瞬变电磁探测矿井采空区积水方面的效果,以山西晋圣永安宏泰煤矿采空区作为研究背景,采用地空瞬变电磁技术探测,对采空区积水结果进行深入研究,并与矿井采掘平面数据和地面实际钻孔数据验证。物探结果表明:瞬变电磁切片解释结果,在矿区东北采空区2处低阻异常与采掘平面中积水情况吻合,矿区南部采空区1处低处异常采掘平面中积水情况吻合。经过现场钻探和采掘平面图的数据验证,验证结果与探测结果具有较高的重合度,效果良好。证明地空瞬变电磁法,在探测煤炭采空区,尤其是废弃矿井积水情况中可行度高,有利于废弃矿井采空区煤层气地面开发应用。

To study the effect of applied TEM technology on mine gob area ponding,taking the coalmine gob area of Jinsheng Yong’an Hongtai coalmine in Shanxi as the subject investigated,through ground-airborne TEM prospecting carried out detailed study on gob area ponding,the results have been verified by mining work plane data and surface actual borehole data.Geophysical prospecting results have shown that two low-resistivity anomalies in mine area northeastern gob area are consistent with mining work plane ponding;one low-resistivity anomaly in southern gob area is consistent with mining work plane ponding.After verification by site drilling and mining work plane graph data,verified results and prospecting results have higher contact ratio,thus good effect.The study has shown that ground-airborne TEM has high feasibility in coalmine gob area prospecting,especially abandoned mine ponding prospecting,thus in favor of abandoned mine gob area CBM surface exploitation application.