Fast GPU-Based Seismogram Simulation from Microseismic Events in Marine Environments Using Heterogeneous Velocity Models

摘要

A novel approach is presented for fast generation of synthetic seismogramsdue to microseismic events, using heterogeneous marine velocity models. Thepartial differential equations (PDEs) for the 3D elastic wave equation havebeen numerically solved using the Fourier domain pseudo-spectral method whichis parallelizable on the graphics processing unit (GPU) cards, thus making itfaster compared to traditional CPU based computing platforms. Due tocomputationally expensive forward simulation of large geological models,several combinations of individual synthetic seismic traces are used forspecified microseismic event locations, in order to simulate the effect ofrealistic microseismic activity patterns in the subsurface. We here explore thepatterns generated by few hundreds of microseismic events with different sourcemechanisms using various combinations, both in event amplitudes and origintimes, using the simulated pressure and three component particle velocityfields via 1D, 2D and 3D seismic visualizations.