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Title: Finite-difference migration to zero offset

Migration to zero offset (MZO), also called dip moveout (DMO) or prestack partial migration, transforms prestack offset seismic data into approximate zero-offset data so as to remove reflection point smear and obtain quality stacked results over a range of reflector dips. MZO has become an important step in standard seismic data processing, and a variety of frequency-wavenumber (f-k) and integral MZO algorithms have been used in practice to date. Here, I present a finite-difference MZO algorithm applied to normal-moveout (NMO)-corrected, common-offset sections. This algorithm employs a traditional poststack 15-degree finite-difference migration algorithm and a special velocity function rather than the true migration velocity. This paper shows results of implementation of this MZO algorithm when velocity varies with depth, and discusses the possibility of applying this algorithm to cases where velocity varies with both depth and horizontal distance.
Authors:
Publication Date:
OSTI Identifier:
7068849
Report Number(s):
DOE/ER/14079-13; CWP--122
ON: DE92016281
DOE Contract Number:
FG02-89ER14079
Resource Type:
Technical Report
Research Org:
Colorado School of Mines, Golden, CO (United States). Center for Wave Phenomena
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; SEISMIC DETECTION; FINITE DIFFERENCE METHOD; ALGORITHMS; CORRECTIONS; MIGRATION; SEISMIC WAVES; VELOCITY; DETECTION; ITERATIVE METHODS; MATHEMATICAL LOGIC; NUMERICAL SOLUTION 422000* -- Engineering-- Mining & Underground Engineering-- (1980-); 990200 -- Mathematics & Computers