基于瞬变电磁的工作原理,利用煤层孔隙-裂隙结构电阻率的变化,分析煤层水力压裂后流场特征以及煤体破裂、裂隙延伸扩展以及含水性增大的过程。通过采用瞬变电磁法对煤层水力压裂流场进行了相关探测,得出了在高压水流场的作用下,水力压裂影响半径可达30m以上并且压裂影响区域具有不均匀性,在应力释放区容易出现水流通道,形成卸压带。 Based on the working principle of transient electromagnetic, the characteristics of the flow field after hydraulic fracturing in coal seams and the process of coal fracture, extension and expansion of fractures and increase of water content were analyzed using the change of resistivity of the pore-fracture structure of coal seam. By using transient electromagnetic method to detect the hydraulic fracturing of coal seam, it is found that under the action of high pressure water flow field, the influence radius of hydraulic fracturing can reach more than 30m and the influence area of ​​fracturing is inhomogeneous. Stress relief zone prone to water channels, the formation of pressure relief zone.