Determination of anisotropic velocity models from walkaway VSP data acquired in the presence of dip

摘要

Wide-aperture walkaday vertical seismic profile (VSP) data acquired through transversely isotropic ho- rizontal layers can be used to determine the P phase- solwness surface, local to a receiver array in a borehole. In the presence of dip, errors in the slowness surface may Occur if the medium is assumed to be layered horizon- Tally.