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Velocity Calibration and Wavefield Decomposition for Walkover VSP Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 70th EAGE Conference and Exhibition incorporating SPE EUROPEC 2008, Jun 2008, cp-40-00239
- ISBN: 978-90-73781-53-5
Abstract
Generalized stacking velocity analysis tools like the Common-Reflection-Surface stack method provide stacking parameters beyond the conventional stacking velocity. These parameters can be expressed in terms of useful geometrical wavefront properties. However, this requires a good estimation of the tuned velocities which are valid for imaging in the vicinity of source and/or receiver of the recorded data. Using the downgoing first arrivals, we introduce a simple and efficient method to determine the velocities at every receiver level in a walkover VSP experiment. The calibrated wavefront properties are subsequently used for the decomposition into upgoing waves arriving either as P- or S-waves at the receivers.