Effective anisotropic velocity model from surface monitoring of microseismic events

0396926 - ÚSMH 2014 RIV US eng J - Journal Article
Zhang, Y. - Eisner, Leo - Barker, W. - Mueller, M.C. - Smith, K.L.
Effective anisotropic velocity model from surface monitoring of microseismic events.
Geophysical Prospecting. Roč. 61, č. 5 (2013), s. 919-930. ISSN 0016-8025. E-ISSN 1365-2478
Institutional support: RVO:67985891
Keywords : induced seismicity * anisotropy * hydraulic fracturing * inversion
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 1.506, year: 2013

We developed a methodology to obtain a consistent velocity model from calibration shots or microseismicity observed on a buried array. Using a layered 1D isotropic model, we invert P-wave arrival times to obtain effective (constant) anisotropic parameters with vertical axis of symmetry (VTI). The joint inversion of selected events shows a largely reduced RMS error and Thomsen anisotropy parameters epsilon of 0.15, and delta of 0.05. These values allow us to locate microseismic events from multiple hydraulic fracture treatments separated across tens of thousands of feet with a single velocity model.
Permanent Link: http://hdl.handle.net/11104/0224633