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Implementation of Elastic Prestack Reverse-Time Migration Using an Efficient Finite-Difference Scheme

Autorzy
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Elastic reverse-time migration (RTM) can reflect the underground elastic information more comprehensively than single-component Pwave migration. One of the most important requirements of elastic RTM is to solve wave equations. The imaging accuracy and efficiency of RTM depends heavily on the algorithms used for solving wave equations. In this paper, we propose an efficient staggered-grid finite-difference (SFD) scheme based on a sampling approximation method with adaptive variable difference operator lengths to implement elastic prestack RTM. Numerical dispersion analysis and wavefield extrapolation results show that the sampling approximation SFD scheme has greater accuracy than the conventional Taylor-series expansion SFD scheme. We also test the elastic RTM algorithm on theoretical models and a field data set, respectively. Experiments presented demonstrate that elastic RTM using the proposed SFD scheme can generate better images than that using the Taylor-series expansion SFD scheme, particularly for PS images. Furthermore, the application of adaptive variable difference operator lengths can effectively improve the computational efficiency of elastic RTM.
Czasopismo
Rocznik
Strony
1605--1625
Opis fizyczny
Bibliogr. 35 poz.
Twórcy
autor
  • Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, yanhongyong@163.com
  • British Geological Survey, Murchison House, Edinburgh, United Kingdom
autor
  • Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
  • University of Chinese Academy of Sciences, Beijing, China
autor
  • British Geological Survey, Murchison House, Edinburgh, United Kingdom
autor
  • British Geological Survey, Murchison House, Edinburgh, United Kingdom
Bibliografia
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  • Chang, W.F., and G.A. McMechan (1994), 3D elastic prestack reverse-time depth migration, Geophysics 59, 4, 597-609, DOI: 10.1190/1.1443620.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-2583299f-7c63-487a-a273-2647d063c127
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