煤层气富集矿井采空区瞬变电磁波场变换成像技术  

Transient electromagnetic wave field transformation imaging technology for coalbed methane enrichment mine goaf

作　　者：邱浩 QIU Hao(Mine Safety Technology Branch,China Coal Research Institute,Beijing 100013,P.R.China;State Key laboratory of Coal Mining and Clean Utilization,Beijing 100013,P.R.China;Beijing Mine Safety Engineering Technology Research Center,Beijing 100013,P.R.China)

机构地区：[1]煤炭科学技术研究院有限公司安全分院,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院),北京100013 [3]北京市煤矿安全工程技术研究中心,北京100013

出　　处：《重庆大学学报》2021年第10期130-138,共9页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(51704162);国家科技重大专项资助项目(2016ZX05045001-004);煤炭科学技术研究院科技发展基金资助项目(2018CX06);天地科技股份有限公司科技创新创业资金专项项目(2018-TDMS005)。

摘　　要：煤矿采空区及采动裂隙是煤层气富集、渗流及赋存的重要载体,精准探测采空区位置及采动裂隙成为煤层气开采的基础工作。基于波场变换理论,采用非线性阻尼最小二乘算法对波场变换积分方程进行反演计算,开展了全空间响应校正及波场数据处理,阐述了矿井瞬变电磁合成孔径工作方法,进行了采空区三维模型波场成像数值模拟,在晋城煤层气富集矿区开展了巷道掘进超前及工作面探测工程应用试验。研究结果表明:波场变换成像技术能够提取瞬变电磁信号中的电性界面信息,对采空区及采动裂隙的富水边界反映明显,钻探验证结果同波场成像及视电阻率综合分析成果吻合,该技术可降低体积效应对采空区及采动裂隙解释工作的不利影响。Mining-induced fractures and goaf are closely related to mine coalbed methane seepage and occurrence. Accurate detection of goaf and mining-induced fractures is the basic work of coalbed methane mining. Based on wave field transformation theory, nonlinear damped least squares algorithm was used to calculate the wave field transformation integral equation. Whole-space response correction and wave field data processing were carried out. The working method of synthetic aperture imaging in coal-mine-underground roadway was expounded. Numerical simulation of 3 D goaf wave field imaging model was carried out. Engineering application were carried out for advanced detection and coal mining face detection methods in Jincheng coalbed methane mining area. The results show that wave field transformation imaging technology can extract electrical boundary information in transient electromagnetic data and obviously reflect the water-rich boundary of the mining-induced fractures and goaf. The drilling verification results are consistent with the results of wave field imaging and apparent resistivity analysis, and the technology can reduce the adverse effects of volume effect on the interpretation of goaf and mining-induced fractures.

关 键 词：矿井瞬变电磁法 采空区探测 波场变换 波场成像 煤层气 

分 类 号：P631.1[天文地球—地质矿产勘探]