Microseismic source distance inversion based on energy attenuation
To achieve source distance inversion using the energy decay law of micro-seism signals,a granite micro-seism propagation simulation model was constructed based on the granular flow principle.And an inverse mathematical model of seismic distance was constructed by fitting the energy decay trend of the empirical modal decomposition processed micro-seism signals using power functions.The numerical calculation results show that the accurate inversion of the distance can be achieved by controlling the model length within 280 m under the condition that the bonding model remains unchanged.The results of acoustic emission tests in laboratory show that the error rate of energy attenuation coefficients of particle flow simulation is 0.2%compared with that of indoor test,and the error rates of distance inversion results are within 0.5%.It is proved that the particle flow simulation model can accurately simulate the energy attenuation law of microseismic signal in granite,and can realize accurate distance inversion.
国家科技期刊平台
NSTL
万方数据
维普
