Efficient migration through complex water-bottom topography

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Geophysics; (United States)

DOI:https://doi.org/10.1190/1.1443422· OSTI ID:6136597

Lynn, W ^[1]; MacKay, S ^[2]; Beasley, C J ^[3]

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1. Grant Tensor, Houston, TX (United States)
2. Western Geophysical, Englewood, CO (United States)
3. Western Geophysical, Houston, TX (United States)

An efficient means of imaging structures beneath complex water-bottom topography is obtained using a conventional time-migration algorithm with a simple modification to the migration-velocity field. The process consists of two migration steps: one with the migration velocity set to zero below the water bottom and the other with the migration velocity set to zero above the water bottom. Between the two steps the data are vertically time shifted to account for the lateral velocity variations between the water-sediment interface. The time shifts used are equivalent to the so-called thin-lens'' term used in depth-migration algorithms. Results obtained from this technique are nearly identical to more costly wave-equation, layer-replacement, and depth-migration techniques.

• OSTI ID: 6136597
• Journal Information: Geophysics; (United States), Journal Name: Geophysics; (United States) Vol. 58:3; ISSN GPYSA7; ISSN 0016-8033
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
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SEISMIC SURVEYS
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TOPOGRAPHY