矿井地震超前探测技术在龙东矿的应用

Application of Mine Advance Seismic Prediction Technology in Longdong Coalmine

龙东煤矿区内构造较为发育,可采或局部可采煤层为7、17、21号煤层,为查明21煤试采区巷道前方断层、破碎带的发育程度及导水状态,采用矿井地震超前探测技术进行了超前探测,测线布置在回风巷左帮上,共设炮点20个,利用两个三分量传感器C1、C2接收。对采集数据进行波场分离、反射波提取、叠前偏移成像等核心技术处理,得到SV波深度偏移处理结果图,从中提取了5个异常界面,分别位于迎头前方22.5m、40.5m、54.5m、64.5m、98.5m,结合地质资料,解释为小断层。根据现场掘进实测剖面资料,矿井地震超前探测技术在龙东矿探测的异常界面准确,其界面距离最大误差率小于10%,表明该技术在掘进迎头前方100m范围内可以有效探测断层等地质构造。

Geological structures are rather well developed in the Longdong coalmine area,mineable or locally mineable coal seams have Nos.7,17 and 21.To identify No.21 coal seam winning testing area roadway forward direction fault,fracture zone development extent and water conducting status,the mine advance seismic prediction technology has used.Survey line has laid out on left wall of the air return way,totally 20 shotpoints,two 3-C sensors C1 and C2 receiving.Collected data are processed through core technologies of wave field separation,reflection wave extraction,prestack migration imaging etc.SV depth migration processed resulting images have obtained,therein 5 anomalous interfaces extracted and interpreted as minor faults based on geological data,located at forward direction 22.5m,40.5m,54.5m,64.5m and 98.5m respectively.According to site driving measured section data,detected anomalous interface locations are accurate,their maximum error rate less than 10%,indicated that the technology can effectively detect geological structures including fault within forward direction 100m range.