Orthotropic Anisotropy Modelling and Parameter Estimation From 3D VSP Data, a Synthetic Analysis
M. Asgharzadeh, A. Bona and M. Urosevic
Event name: 81st EAGE Conference and Exhibition 2019
Session: Poster: Anisotropy and Fractured Reservoirs A
Publication date: 03 June 2019
Info: Extended abstract, PDF ( 1.28Mb )
Price: € 20
Knowledge of orthotropic velocity anisotropy in a sedimentary basin can facilitate application of advanced methods in processing and interpretation of large offset-wide azimuth seismic data. Here, we model an orthotropic medium in a succession of VTI layers by adding vertical fractures to a VTI host layer and measure P-wave velocities in a synthetic radial VSP experiment. We invert P-wave velocities for orthotropic parameters and show that to obtain valid results, line spacing of (maximum) 10 degrees and source-receiver offsets of no less than the depth of orthotropic layer are essential.