A modified delay-time method for statics estimation with the virtual refraction

作者：Mikesell T Dylan^*; van Wijk Kasper; Ruigrok Elmer; Lamb Andrew; Blum Thomas E

来源：Geophysics, 2012, 77(6): A29-A33.

DOI：10.1190/GEO2012-0111.1

Topography and near-surface heterogeneities lead to traveltime perturbations in surface land-seismic experiments. Usually, these perturbations are estimated and removed prior to further processing of the data. A common technique to estimate these perturbations is the delay-time method. We have developed the %26quot;modified delay-time method,%26quot; wherein we isolate the arrival times of the virtual refraction and estimate receiver-side delay times. The virtual refraction is a spurious arrival found in wavefields estimated by seismic interferometry. The new method removes the source term from the delay-time equation, is more robust in the presence of noise, and extends the lateral aperture compared to the conventional delay-time method. We tested this in an elastic 2D numerical example, where we estimated the receiver delay-times above a horizontal refractor. Taking advantage of reciprocity of the wave equation and rearranging the common shot gathers into common receiver gathers, isolated source delay times could also be obtained.

• 出版日期2012-12