Method of migrating seismic data

Details Method of migrating seismic data Method of migrating seismic data

1987-11-03

1989-12-19

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 50, 367 51, G01V 136

Patent

active

048887420

ABSTRACT:
A method for migrating seismic data in the frequency-wave number domain is provided for migrating the seismic data having large vertical and lateral velocity variations in a fast, efficient and accurate manner. A root-mean-square (RMS) velocity function is derived from a set of seismic data samples comprising a body of seismic data. A best fit migration velocity is determined from the seismic data so as to provide a best migration. The seismic data may then be partitioned into a series of discreet frames and stretched according to a predetermined algorithm. Each partition is migrated in series by a portion of the RMS Velocity function until the data are fully migrated. After migration, the migrated seismic data are inversely stretched vertically followed by an inverse lateral stretch to remove any distortion instilled in the data by the initial data stretching.

REFERENCES:
"Migration by Fourier Transformation", R. H. Stolt, Geophysics, Vol. 43, #1, 1978.
Larner, K. and Beasley, C., 1986, Cascaded Migrations: A Way of Improving the Accuracy of Finite-Difference Migration; 55th Annual Meeting S.E.G., Washington, D.C., 70 pages.
Beasley et al., Cascaded Frequency-Wavenumber (f-k) Migration: 57 Annual S.E.G. International Meeting, New Orleans, Louisiana, 33 pages.
Beasley, C., 1987, Migration in Stages; Abstract presented at the Geophysical Imaging Symposium, Tulsa, Oklahoma.

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