Semi-recursive imaging under complex velocity structures

Details Semi-recursive imaging under complex velocity structures Semi-recursive imaging under complex velocity structures

1997-05-05

2000-06-27

Oda, Christine

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 73, 367 57, 367 56, 367 59, 367 54, 367 36, G01V 128

Patent

active

060814829

ABSTRACT:
A computationally efficient semi-recursive Kirchhoff migration algorithm is capable of obtaining accurate images of complex structures in complex geological environments which commonly give rise to multivalued arrivals. The method alternates wave-equation datuming (downward continuation) and Kirchhoff migration. Breaking up the complicated velocity structure into small depth regions allows traveltimes to be calculated in regions where the computation is well behaved and where the computation corresponds to energetic arrivals. Because traveltimes are computed for small depth domains, the effects of multivalued arrivals are implicitly accounted for in the migration and the adverse effects of caustics and headwaves do not develop. The invention can use any simple first-arrival traveltime algorithm, and thus benefits from the computational efficiency, robustness, and simplicity of such algorithms.

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