Improvement of seismic imaging in a low signal-to-noise area by the use of post-stack stereotomography
I. Panea1, E. Landa2, G.G. Drijkoningen3, R. Baina2
1University of Bucharest, Faculty of Geology and Geophysics, 6 Traian Vuia Str, RO-020956, Bucharest,
Romania and Research School Integrated Solid Earth Sciences (ISES), The Netherlands
2OPERA, Rue Jules Ferry, Batiment IFR, 64000 Pau, France
3Research School Integrated Solid Earth Sciences (ISES), The Netherlands
Abstract:Stereotomography belongs to the slope methods providing a velocity model by traveltime inversion. It can be applied using the traveltimes picked on prestack data and post-stack data. In this paper we apply post-stack stereotomography on a land seismic reflection dataset with the purpose to get an accurate 2D velocity. Then, the velocity information is used to perform a pre-stack depth migration using the Kirchhoff method, the same like that one used in the standard processing flow. The post-stack stereotomography results are different than those of the standard processing. The Common-Reflection-Surface (CRS) stack shows some areas where the reflectivity is enhanced, compared to those from the Common-Midpoint (CMP) stack, obtained from standard processing. The 2D velocity model, obtained through the inversion of the picked traveltimes on the CRS stack and verified through the Common-Image-Gathers (CIG) analysis, contains good and reliable velocities that provide a better depth image of the subsurface.