Joint migration velocity analysis of PP- and PS-waves for VTI media

Combining PP-waves with mode-converted PS reflections in migration velocity analysis can help build more accurate VTI velocity models. To avoid problems caused by the moveout asymmetry of PS-waves and take advantage of efficient MVA algorithms designed for pure modes, I suggest to generate pure SS-reflections from PP and PS data using the PP+PS=SS method. Then the residual moveout in both PP and SS common-image gathers is minimized during iterative velocity updates. The objective function also includes the differences between the migrated depths of the same reflectors on the PP and SS sections and a regularization term. Synthetic examples confirm that 2D MVA of PP- and PS-waves may be able to resolve all four relevant parameters of VTI media if reflectors with at least two distinct dips are available. The algorithm is also applied to a 2D line from 3D OBS data acquired at Volve field in the North Sea.

Name thesis:degree_name

Master of Science (M.S.)

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Geophysics

Grantor dc:publisher

Colorado School of Mines. Arthur Lakes Library

Year dc:date.issued

2013

Author dc:creator

• Cai, Pengfei

Advisor dc:contributor.advisor

• TSvankin, I. D.

Committee members dc:contributor.committeemember

• Davis, Thomas L. (Thomas Leonard), 1947-
• Lynn, Walter

• MVA
• multicomponent
• codepth
• anisotropy

Statement dc:rights

• Copyright of the original work is retained by the author.

Language dc:language.iso

eng, English

Identifier

T 7171

OAI identifier oai:identifier

oai:repository.mines.edu:11124/79397