Seismic migration using offset checkshot data

Details Seismic migration using offset checkshot data Seismic migration using offset checkshot data

1997-12-09

1999-12-14

Oda, Christine K.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 50, G01V 136

Patent

active

060026421

ABSTRACT:
A method of migrating seismic data using offset checkshot survey measurements. The offset checkshot survey measurements involve raypaths similar to the migration raypaths for the seismic data, and are used to determine direct arrival traveltimes to receivers in a borehole. Embodiments of the invention provide for direct use of the traveltimes in migration, or indirect use of the traveltimes in migration via construction of a migration velocity model. The velocity model embodiments further provide for either traveltime error correction via use of interpolated error functions or construction of migration error tables. The invention can be employed for time, depth or Kirchhoff migration, in either two or three dimension, and in either prestack or poststack applications. The invention may be used to migrate any type of seismic data, including compressional-wave, shear-wave, and converted-wave seismic data.

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