论文部分内容阅读
针对煤矿井下水力压裂裂缝扩展规律及增透范围不明确的问题,提出了在压裂过程中实施微地震监测技术。分析了煤矿井下水力压裂微震监测震源定位原理,建立煤岩体破裂的走时方程。进行了水力压裂过程中煤岩体破裂激发能量正演计算,证明选用的YTZ3微震监测系统满足要求,并确定了微震监测流程。随着注入水压力的增加,微震数量明显增加,最大振动能量明显增加,微震信号的初至时距关系及能量关系基本一致。
In view of the problems of the expanding law of hydraulic fracturing cracks in coal mine and the range of increasing penetration, the microseismic monitoring technique in fracturing process is proposed. The location principle of microseismic monitoring of coal mine hydraulic fracturing is analyzed, and the travel time equation of coal and rock mass rupture is established. The fractured excitation energy of coal and rock mass was calculated in the process of hydraulic fracturing. It is proved that the selected YTZ3 microseismic monitoring system meets the requirements and the microseismic monitoring process is confirmed. With the increase of injected water pressure, the number of microseismic increases obviously and the maximum vibration energy increases obviously. The first arrival time relation and energy relation of microseismic signal are basically the same.