Elastic imaging and time-lapse migration based on adjoint methods

Hejun Zhu, Yang Luo, Tarje Nissen-Meyer, Christina Morency, Jeroen Tromp

Research output: Contribution to journalArticle

69 Scopus citations

Abstract

We have drawn connections between imaging in exploration seismology, adjoint methods, and emerging finite-frequency tomography. All of these techniques rely on spatial and temporal constructive interference between observed and simulated waveforms to map locations of structural anomalies. Modern numerical methods and computers have facilitated the accurate and efficient simulation of 3D acoustic, (an)elastic, and poroelastic wave propagation. Using a 2D cross section of the SEG/EAGE salt model, we have determined how such waveform simulations might be harnessed to improve onshore and offshore seismic imaging strategies and capabilities. We have found that the density sensitivity kernel in adjoint tomography is related closely to the imaging principle in exploration seismology, and that in elastic modeling the impedance kernel actually is a better diagnostic tool for reflector identification. The shear- and compressional-wave speed sensitivity kernels in adjoint tomography are related closely to finite-frequency banana-doughnut kernels, and these kernels are well suited for mapping larger-scale structure, i.e., for transmission tomography. These ideas have been substantiated by addressing problems in subsalt time-lapse migration.

Original languageEnglish (US)
Article numberGPYSA7000074000006WCA167000001
Pages (from-to)XWCA167-WCA177
JournalGeophysics
Volume74
Issue number6
DOIs
StatePublished - Jan 1 2009

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

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    Zhu, H., Luo, Y., Nissen-Meyer, T., Morency, C., & Tromp, J. (2009). Elastic imaging and time-lapse migration based on adjoint methods. Geophysics, 74(6), XWCA167-WCA177. [GPYSA7000074000006WCA167000001]. https://doi.org/10.1190/1.3261747