Joint PP and PS plane-wave wave-equation migration-velocity analysis

Feng, Zongcai; Guo, Bowen; Huang, Lianjie

doi:10.1190/geo2018-0521.1

Joint PP and PS plane-wave wave-equation migration-velocity analysis

Journal Article · Mon May 13 00:00:00 EDT 2019 · Geophysics

DOI:https://doi.org/10.1190/geo2018-0521.1· OSTI ID:1542820

Feng, Zongcai ^[1]; Guo, Bowen ^[2]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
King Abdullah Univ. of Science and Technology, Thuwal (Saudi Arabia)

Conventional joint PP and PS velocity analysis is based on ray tomography. We develop a joint PP and PS wave-equation migration-velocity-analysis method using plane-wave common-image gathers (CIGs) to produce accurate P- and S-wave velocity models. The objective function of our new method consists of three terms: The first and second terms penalize the moveout residuals computed from PP and PS plane-wave CIGs, respectively, and the third term constrains the nonzero relative depth shifts between the PP and PS migration images. The moveout of plane-wave CIGs is automatically picked using a semblance analysis method, and the relative depth shifts between the PP and PS images are automatically computed using dynamic warping or manually picking the depths of certain primary reflectors. The moveout residuals and the relative depth shifts are transformed into weighted image perturbations, and they are then projected into the velocity models to update the P- and S-wave velocity models using the scalar-wave equations and their linearized forms. Here, numerical tests with synthetic and multicomponent field data demonstrate that our method can simultaneously invert for accurate P- and S-wave velocity models for elastic migration.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1542820

Report Number(s):: LA-UR--18-26186

Journal Information:: Geophysics, Journal Name: Geophysics Journal Issue: 4 Vol. 84; ISSN 0016-8033

Publisher:: Society of Exploration GeophysicistsCopyright Statement

Country of Publication:: United States

Language:: English

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