Migration velocity analysis using prestack wavefields

T. Alkhalifah*, Z. Wu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Using both the image and data domains to perform velocity inversion can help us resolve the long and short wavelength components of the velocity model, usually in that order. This translates to integrating migration velocity analysis (MVA) into full waveform inversion (FWI). The MVA part of the inversion often requires computing extended images, which is pricy using conventional methods. As a result, we use prestack wavefield (the double-square-root (DSR)) extrapolation, which includes the extended information (subsurface offsets) naturally, to make the process far more efficient and stable. The combination of the forward and adjoint prestack wavefields provides us with update options that can be easily conditioned to improve convergence. We, specifically, use a modified differential semblance operator to divide the extended image to the residual part for classic differential semblance operator (DSO) updates and the image modeling part, which provides reflections for higher resolution information. In our implementation, we invert for the velocity and the image simultaneously through a dual objective function. Application to the Marmousi model demonstrates the features of the approach.

Original languageEnglish (US)
Title of host publication77th EAGE Conference and Exhibition 2015
Subtitle of host publicationEarth Science for Energy and Environment
PublisherEuropean Association of Geoscientists and Engineers, EAGE
Pages1490-1494
Number of pages5
ISBN (Electronic)9781510806627
DOIs
StatePublished - Jan 1 2015
Event77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment - Madrid, Spain
Duration: Jun 1 2015Jun 4 2015

Publication series

Name77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment

Conference

Conference77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment
CountrySpain
CityMadrid
Period06/1/1506/4/15

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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