Prestack depth migration using straight ray technique(SRT)

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Lim, Harry Y.; Min, Dong-Joo; Shin, Changsoo; Yang, Dongwoo; Cha, Youngho; Suh, Jung hee

Issue Date
Geophysical Press
Journal of Seismic Exploration, 11: 271-281
straight ray techniqueKirchhoff prestack depth migrationtraveltime calculationKirchhoff hyperbolapolar coordinatespherical coordinate
Kirchhoff prestack depth migration requires an elaborate book-keeping effort and a massive
IO process to construct Kirchhoff hyperbolas. In order to avoid the complexity of the programming
code and the massive IO process, we propose a straight ray technique (SRT) for traveltimi
calculations in Kirchhoff migration. Since all the rays are straight in. polar coordinates for the 2D
velocity model,or in sphericalc oordinatesf or the 3D velocity model, traveltimesc an be simply
computed along a straight ray for a given source-receiver configuration,without suffering from
shadow zones and caustics, and used directly for building Kirchhoff hyperbolas. In this way, we
clrcumvent the substantial IO process required for reading traveltimes on a disk and save
computationals torage.N umerical examplesd emonstrateth at SRT computest raveltimesi ntermediate
between first-arrival traveltimes and the most energetic arrival traveltimes, resulting in better images
than the first arrival traveltimes for the 2D IFP Marmousi data. With the implementation of SRT
for 2D Kirchhoff migration, we successfully extend our SRT to 3D Kirchhoff misration for the
SECiEAGE salr dome data.
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