CSAMT在大埋深煤层顶板富水性探测中的应用

CSAMT applied to detect roof watery of high depth seam

针对大埋深首采区煤层顶板富水性难以确定的问题,采用可控源音频大地电磁法(CSAMT)对赤城煤矿首采区煤层顶板进行富水性探测。通过对5-2^(#)煤层顶板以上50、100、150、200 m处分别进行切片分析,结果表明:5-2^(#)煤层顶板以上50 m处(延安组)的电阻率值比煤层低,顶板砂岩低阻异常区7处;5-2^(#)煤层顶板以上100 m处的砂岩低阻异常区比顶板以上50 m处的低阻异常区范围减小,甚至完全收敛;5-2^(#)煤层顶板以上150、200 m处无低阻异常区富水性相对较小。研究成果为矿井首采区工作面的安全生产提供了参考。

According to a problem hard to determine a roof watery of a seam in a high depth first min-ing panel,a controlled source audio-frequency magnetotelluric method(CSAMT)was applied to detect the roof watery of the seam in the first mining panel of Chicheng Coal Mine.A slice analysis was con-ducted with the slices from 50 m,100 m,150 m and 200 m above the roof of No.5-2^(#)seam.The analy-sis results showed that the resistivity value at 50 m(Yan’an Formation)above No.5-2^(#)seam was lower than the seam and there were 7 low resistivity abnormal areas in the roof sandstone.At 100 m a-bove No.5-2^(#)seam,the low abnormal area in the sandstone was smaller than the low resistivity abnor-mal area scope at 50 m above the roof and even the abnormal area was disappeared completely.At 150 m and 200 m above the roof of No.5-2^(#)seam,the watery in the no low resistivity abnormal area was relatively low.The study results could provide the references to the safety production of the coal min-ing face in the first mining panel of the mine.