Migration without migraines

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:89737

Lines, L; Burton, A; Lu, H X ^[1]

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1. Memorial Univ. of Newfoundland, St. John`s (Canada)

Accurate velocity models are a necessity for reliable migration results. Velocity analysis generally involves the use of methods such as normal moveout analysis (NMO), seismic traveltime tomography, or iterative prestack migration. These techniques can be effective, and each has its own advantage or disadvantage. Conventional NMO methods are relatively inexpensive but basically require simplifying assumptions about geology. Tomography is a more general method but requires traveltime interpretation of prestack data. Iterative prestack depth migration is very general but is computationally expensive. In some cases, there is the opportunity to estimate vertical velocities by use of well information. The well information can be used to optimize poststack migrations, thereby eliminating some of the time and expense of iterative prestack migration. The optimized poststack migration procedure defined here computes the velocity model which minimizes the depth differences between seismic images and formation depths at the well by using a least squares inversion method. The optimization methods described in this paper will hopefully produce ``migrations without migraines.``

• OSTI ID: 89737
• Report Number(s): CONF-941015--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
58 GEOSCIENCES
ALGORITHMS
CORRECTIONS
GEOLOGIC DEPOSITS
IMAGE PROCESSING
MATHEMATICAL MODELS
PETROLEUM INDUSTRY
SEISMIC SURVEYS
SEISMIC WAVES