Method of determining 3-D acoustic velocities for seismic survey

Details Method of determining 3-D acoustic velocities for seismic survey Method of determining 3-D acoustic velocities for seismic survey

1993-06-30

1996-04-30

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 53, 367 72, 364421, G01V 128, G01V 136

Patent

active

055131506

ABSTRACT:
A method of producing a velocity volume for a seismic survey volume, based on two-way time seismic data and process velocity data, is disclosed. Two-way time seismic data is loaded into a computer for a plurality of seismic shot lines in the survey region, as are process velocities for common depth points (CDPs) in the survey region. The process velocities correspond to velocities used to perform normal move-out, dip move-out, migration and other imaging processes. The computer can display the two-way time information in cross-section or map views, and can display the velocity functions as a function of two-way time. The human analyst enters interpreted velocities, based on actual data or on visualization of the horizons, into the cross-sectional view of the seismic shot line, and then edits the input velocity data to produce a velocity function, for each CDP of interest, that matches the interpreted values. Repeating this process for each of the seismic shot lines, and for as many CDPs as desired, produces a velocity volume model more suitable for use in time-to-depth conversion.

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Tegland, "Computer-Assisted Interpretation of Seismic Structure and Velocity Data", presented at 42nd annual meeting of Society of Exploration Geophysics (1972).

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