Accuracy of 2-D depth migration in transversely isotropic media using explicit operators

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

OSTI ID:89735

Uzcategui, O ^[1]

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1. Colorado School of Mines, Golden, CO (United States)

It is known that significant misposition errors arise when data from transversely isotropic (TI) media are migrated using migration algorithms that ignore anisotropy. Here, the author discusses the accuracy of the explicit depth-extrapolation process as applied to depth migration in TI media characterized by Thomsen`s parameters (V{sub p0}, V{sub s0}, {epsilon}, {delta}). First, he studies which of the Thomsen`s parameters most influence the calculation of explicit operators for the P and SV (quasi-P and quasi-SV propagation) modes. For the P propagation mode, one needs only calculate explicit operators for each pair of {epsilon} and {delta} values. Lateral and vertical changes in vertical P-wave velocity (V{sub p0}) are handled by calculating tables of operators for different ratios of normalized frequency, f{Delta}x/V{sub p0}, just as is done for isotropic media. The vertical shear-wave velocity (V{sub s0}) does not have a significant influence on accuracy for typical values of {epsilon} and {delta} found in sedimentary basins. For the SV mode, explicit operators are needed for each value of parameter {sigma}, introduced by Tsvankin and Thomsen (1994).

• OSTI ID: 89735
• Report Number(s): CONF-941015--
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
ALGORITHMS
ERRORS
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IMAGE PROCESSING
RESPONSE FUNCTIONS
SEISMIC SURVEYS
SEISMIC WAVES
WAVE PROPAGATION