煤矿CSAMT数据的广域电磁法处理  

Processing of coal mine CSAMT data with wide field electromagnetic method

作　　者：朱云起 李帝铨 刘最亮[4] 张新 ZHU Yunqi;LI Diquan;LIU Zuiliang;ZHANG Xin(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University),Ministry of Education,Changsha 410083,China;Hunan Nonferrous Resources and Geological Hazards Exploration Key Laboratory of Hunan Province,Changsha 410083,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Huayang New Material Technology Group Co.,Ltd.,Yangquan 045000,China)

机构地区：[1]有色金属成矿预测与地质环境监测教育部重点实验室(中南大学),湖南长沙410083 [2]湖南有色资源与地质灾害探查湖南省重点实验室,湖南长沙410083 [3]中南大学地球科学与信息物理学院,湖南长沙410083 [4]华阳新材料科技集团有限公司,山西阳泉045000

出　　处：《煤田地质与勘探》2023年第4期133-142,共10页Coal Geology & Exploration

基　　金：国家重点研发计划课题(2018YFC0807802)。

摘　　要：某煤矿采用V8多功能电法仪开展CSAMT探测试验,由于研究区内电磁干扰严重,得出的卡尼亚视电阻率质量较低。为了提高视电阻率数据的质量及其利用率,尝试采用广域电磁法进行CSAMT数据的处理,分别应用单分量电场法、比值法(电场和磁场相比)计算广域视电阻率。结果表明:由于V8施工时不采集场源发射电流,单分量电场法计算结果误差较大;比值法的计算结果在高频段与卡尼亚视电阻率一致,但在低频段优于卡尼亚视电阻率,与实际地电情况更吻合;比值法广域视电阻率的反演结果准确地揭示了矿区含煤地层和奥陶系灰岩的界面,地层解释结果与钻探结果一致,验证了广域电磁法在煤矿CSAMT数据处理中的可行性和有效性。研究成果为其他矿产资源的CSAMT数据处理提供参考。A CSAMT detection test was carried out for a coal mine with V8 multi-functional electrical instrument.Due to the serious electromagnetic interference within the area,the Cagniard apparent resistivity was low in quality.In order to improve the quality and utilization rate of data,authors attempted to process the CSAMT data collected by V8 with the wide field electromagnetic method,which used single-component method and ratio method(Electric field divided by magnetic field)to calculate apparent resistivity.The results showed that there was some deviation between the singlecomponent wide field apparent resistivity and the actual terrestrial electricity because the emission current was not measured during the construction of V8.The wide field apparent resistivity of ratio method was agree with the Cagniard apparent resistivity in the high frequencies but significantly better in the low frequencies,and consistent with the actual terrestrial electricity.In addition,the inversion results of the ratio method wide field apparent resistivity accurately reflected the interface between the coal measure strata and the Ordovician limestone.The geological interpretation corresponded well with the drilling results,which verified the feasibility and effectiveness of wide field electromagnetic method in CSAMT data processing for coal mines.The research results also provide references for CSAMT data processing of other mineral resources.

关 键 词：CSAMT WFEM 强干扰环境 广域视电阻率 卡尼亚视电阻率 

分 类 号：P631[天文地球—地质矿产勘探]