![]() ![]() We test the proposed strategy on field data and estimate a set of velocity models that honor the observed data, which we validate carrying out a simulated microseismic event location. To avoid local minima and other convergence issues, we minimize the resulting objective function using very fast simulated annealing (VFSA). This leads to a constrained non linear inverse problem that consists of minimizing the discrepancies between the observed and calculated P and S-wave arrival time differences. Assuming layered modelswith weak anisotropy, we make use of the information provided by well logs and perforation shots of known position to estimate the layer velocities, depths and anisotropy. ![]() ![]() We provide well-calibrated VTI velocity models useful to locate microseismic events in the VacaMuerta shale formation, Neuquén, Argentina. ![]()
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