期刊
COMPUTERS & GEOSCIENCES
卷 60, 期 -, 页码 88-97出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cageo.2013.07.010
关键词
Wave-equation traveltime inversion; Steepest descent method; Conjugate gradient method; L-BFGS method
资金
- Science Foundation of Key Laboratory of Engineering Geomechanics
- Institute of Geology and Geophysics
- Chinese Academy of Sciences [KLEG201110]
- National Basic Research Program of China (973 Program) [2011CB707303-ZT5]
- National Science and Technology Major Project of China [2011ZX05030-004-001]
Compared to traditional traveltime inversion methods, no traveltime picking, high-frequency assumption or ray tracing is necessary in wave-equation traveltime inversion (WT). Another merit of WT is that it is insensitive to the starting model. Although WT offers less detailed parts of velocity model than the full waveform inversion (FWI), it can provide a good initial velocity model for FWI. In this paper, the steepest descent, conjugate gradient and limited-memory BFGS (L-BFGS) optimization methods are used in the implementation of acoustic WT. We use synthetic crosswell data for testing and the numerical results show that L-BFGS has a faster rate of convergence and offers a reconstructed velocity model with better resolution compared to the other two gradient methods. (C) 2013 Elsevier Ltd. All rights reserved.
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