AMPLITUDE-OFFSET ANALYSIS OF WAVEFIELD CONTINUATION
S.V. Gol'din and E.V. German*
Institute of Geophysics, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
* Novosibirsk State University, 2 ul. Pirogova, Novosibirsk, 630090, Russia
Keywords: Ray method, wavefield continuation, geometric spreading, wave amplitude, reflector
Pages: 1098-1106
Abstract
Offset wavefield continuation can reduce seismograms to a zero-offset case which simplifies data processing, e.g., migration or AVO analysis. Then it is important to constrain amplitude moveout associated with DMO correction. We suggest to estimate amplitude moveout in DMO as a boundary-value solution for Fomel's partial differential equation, using the standard ray method. DMO correction causes no amplitude moveout for plane reflectors, and moveout arising in reflection from curved interfaces is a complex function of curvature, dip, and offset. The obtained equations can be applied to correct DMO data to be further used in AVO analysis.
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