Method for depth imaging multicomponent seismic data

Details Method for depth imaging multicomponent seismic data Method for depth imaging multicomponent seismic data

G - Physics

01

V

349/14

G01V 1/28 (2006.01) G01V 1/30 (2006.01)

Patent

CA 1304147

ABSTRACT The present invention relates generally to a method of geophysical exploration and more particularly to a novel method for imaging multicomponent seismic data to obtain better depth images of the earth's subsurface geo- logical structure as well as better estimates of compres- sional and shear wave interval velocities. In particular, measures are obtained of imparted seismic wavefield poten- tials incident on reflecting interfaces in the earth's subsurface and of resulting seismic wavefield potentials scattered therefrom. The incident and scattered seismic wavefield potentials are employed to produce time-depen- dent reflectivity functions representative of the reflect- ing interfaces. By migrating the time-dependent reflectivity functions, better depth images of the reflecting interfaces can be obtained. For a dyadic set of multicomponent seismic data, the dyadic set of multi- component seismic data are partioned so as to separate the variously coupled incident and reflected wavefield poten- tials in the recorded multicomponent seismic data. The incident and reflected wavefield potentials are cross- correlated to form time-dependent reflectivity functions. The time dependent reflectivity functions are then iter- atively migrated according to a model of wavefield poten- tial velocities of propagation to obtain better estimates of the compressional and shear wave interval velocity. The migrated reflectivity functions can then be stacked to produce better depth images of the earth's subsurface geo- logical structures.

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