From two-way time to depth and pressure for interpretation of seismic geometries and velocities offshore

Alexey Goncharov

doi:10.1071/ASEG2012ab215

ISSN: 2202-0586
E-ISSN:

oa From two-way time to depth and pressure for interpretation of seismic geometries and velocities offshore
Authors Alexey Goncharov^a
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^a Geoscience Australia, GPO Box 378 Canberra ACT 2601, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2012ab215
- Published online: 01 Dec 2012

Abstract

Summary

The effect of water and rock loading on seismic velocities and consequently on interpreted geometries is often underestimated in offshore studies. Direct comparative analysis of interval velocity patterns between areas of significantly different water depth and thickness of rock overburden requires various pressure related changes in velocity to be accounted for. Presentation of velocity models as a function of pressure rather than two-way time, or depth, emerges as a possible solution. An accurate velocity model is essential for meaningful timeto-depth conversion of interpreted seismic horizons. Ideally, it should be based on integration of seismic velocities from well log measurements, refraction seismic surveys and from stacking of multi-channel marine reflection data. In some cases velocities derived from stacking of high quality long streamer marine reflection seismic data correlate reasonably with well log measurements and velocities derived from refraction seismic studies, and provide clues to reasonable depth conversion and lithology interpretation.

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2012-12-01

2026-01-15

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References

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/content/journals/10.1071/ASEG2012ab215

Article Type: Research Article

Keyword(s): pressure effects.; seismic velocity; time-depth conversion

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