川南地区煤矿采空区的瞬变电磁法异常特征

Geophysical anomaly characteristics of transient electromagnetic method in goaf exploration in south Sichuan area

为了给页岩气钻井平台的选址提供深部的地球物理信息,通过在预选钻井平台位置开展煤矿采空区电法勘探工作,采用瞬变电磁法对煤矿采空区进行探测[1],总结出川南地区煤矿采空区的不同状态呈现出的不同的视电阻率等值线分布特征、视电阻率值高低特征。从而判断出预选平台位置下方煤矿采空区的分布情况,以达到选择合适的钻井平台位置的目的。

In order to provide deep geophysical information for the site selection of the shale gas drilling platform,the transient electromagnetic method is used to detect the mined-out area of the coal mine through the electrical exploration of the mined-out area at the location of the pre-selected drilling platform,the distribution characteristics of apparent resistivity isoline and the value of apparent resistivity in different states of mined-out area in south Sichuan are summarized.Therefore,the distribution of mined-out area under the preselection platform position can be determined so as to select a suitable drilling platform position.