US 11,940,579 B2
Method and system using wave-equation for obtaining traveltime and amplitude used in Kirchhoff migration
Hui Huang, Katy, TX (US); Diancheng Wang, Houston, TX (US); and Ping Wang, Sugarland, TX (US)
Assigned to CGG SERVICES SAS, Massy (FR)
Filed by CGG SERVICES SAS, Massy (FR)
Filed on Nov. 8, 2021, as Appl. No. 17/453,994.
Claims priority of provisional application 63/165,774, filed on Mar. 25, 2021.
Prior Publication US 2022/0308245 A1, Sep. 29, 2022
Int. Cl. G01V 1/28 (2006.01); G01V 1/30 (2006.01); G01V 1/34 (2006.01)
CPC G01V 1/282 (2013.01) [G01V 1/301 (2013.01); G01V 1/305 (2013.01); G01V 1/307 (2013.01); G01V 1/345 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A seismic exploration method comprising:
obtaining seismic data acquired in an area over a subsurface formation;
migrating the seismic data based on a model of the subsurface formation and using a wave-equation Kirchhoff, WEK, technique, for pre-defined surface locations, the WEK technique including:
forward-propagating a low-frequency wavefield from a shot location among the pre-defined locations,
deriving an arrival traveltime of a maximum amplitude of the low-frequency wavefield, and
applying Kirchhoff migration using the arrival traveltime and the maximum amplitude; and
outputting an image of the subsurface formation based on the migrated seismic data.