Although hydraulic fracturing and microseismic technology are well developed now, the research of microseismic wavefield simulation in hydraulic fracturing processes is still limited. In this paper, we construct a comprehensive method to simulate a microseismic wavefield and analyze the influence of fracturing domain. Firstly, we combine the fluid seepage equation, fracture mechanics and critical pressure criterion to simulate the 3D hydraulic fracturing process and obtain the pore pressure and microseismic events distribution; then the Coates-Schoenberg method and fracture compliances are used to calculate the real-time velocity model of fracturing domain; finally, the staggered-grid finite difference algorithm is applied to simulate the microseismic wavefield. We analyze the influence of fracturing domain on microseismic wavefield at different stages during the simulation. The numerical simulation results show that the influence from the fracturing domain grows with fracturing progress, and diffraction at the margin of the fracture domain has the strongest effect.


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