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 is used to calculate the wave field transformation integral equation. Whole-space response correction and wave field data processing are carried out . The working method of synthetic aperture imaging in coal mine underground roadway is expounded. Numerical simulation of 3D goaf wavefield imaging model are carried out.Engineering application were carried out for advanced detection and coal mining face detection methods in Jincheng coalbed methane mining area. .This technology obviously reflects the water-rich boundary of the mining-induced fractures and goaf. Wavefield transformation imaging technology can extract electrical boundary information in transient electromagnetic data. The wave field result can reduce the adverse effects of volume effect on the goaf and mining-induced fractures interpretation. Wave field transformation imaging technology is suitable for detection of goaf and mining-induced fractures. The results of drilling verification are consistent with the results of wave field imaging and apparent resistivity analysis.

国家自然科学基金 (51704162)、国家科技重大专项（2016ZX05045001-004）、煤炭科学技术研究院科技发展基金（2018CX06）联合资助