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Estimating anisotropy parameters and traveltimes in the tau-p domain

By M. Van der Baan and J.M. Kendall


The presence of anisotropy influences many aspects of\ud seismic wave propagation and has therefore implications\ud for conventional processing schemes. To estimate the\ud anisotropy, we need both forward modelling and inversion\ud tools. Exact forward modelling in anisotropic media\ud is generally done by raytracing. However, we present a\ud new and fast method, using the tau-p transform, to calculate\ud exact P and SV reflection moveout curves in stratified,\ud laterally homogeneous, anisotropic media which\ud requires no ray tracing. Results are exact even if the\ud SV-waves display cusps. In addition, we show how the\ud same method can be used for parameter estimation.\ud Since inversion for anisotropic parameters is very\ud nonunique, we develop expressions requiring only a reduced\ud number of parameters. Nevertheless, predictions\ud using these expressions are more accurate than Taylor\ud series expansions and are also able to handle cusps in\ud the SV traveltime curves. In addition, layer stripping is\ud a linear process. Therefore, both effective (average) and\ud local (interval) estimates can be obtained

Year: 2002
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