Tomographic estimation of seismic transmission velocities from c

Details Tomographic estimation of seismic transmission velocities from c Tomographic estimation of seismic transmission velocities from c

1991-02-14

1992-02-18

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 50, 367 53, G01V 128, G01V 136

Patent

active

050899945

ABSTRACT:
A method for improving velocity models so that constant-offset migrations estimate consistent positions for reflectors includes tomographic estimation of seismic transmission velocities from constant-offset depth migrations. A method of converting inconsistencies in reflector positioning from constant-offset migrations into equivalent errors in modeled travel times is introduced, so that conventional methods of traveltime tomography can improve the velocity model. An improved velocity model allows a more accurate migrated image of the subsurface. The estimated velocity model can also detect anomalous regions of geologic significance, such as low velocity gas accumulations and irregular near surface weathering. In an alternate embodiment the procedure can be iterative and allow alternating improvements in the positions of reflectors and in the velocity model.

REFERENCES:
patent: 4330872 (1982-05-01), Bratton
patent: 4839869 (1989-06-01), Corcoran
patent: 4964088 (1990-10-01), Chittneni
Numerical Recipes, Press et al., 1986-"Two Point Boundary Value Problems".
Vidale, John E. "Finite-Difference Calculation of Traveltimes in 3-D", University of California at Santa Cruz.
Moser, T. J., "Efficient Seismic Ray Tracing Using Graph Theory," University of Utrecht, Netherlands.
"Velocity Analysis Using Prestack Depth Migration: Applying the Linear Theory," Etgen, J. T., Stanford U.
"Velocity Analysis Using Prestack Depth Migration: Linear Theory," Etgen, J. T., Stanford U. 1989.

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