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| Keywords | |
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Kirchhoff beam migration |
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prestack depth migration |
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coarse grid selection |
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beam propagator |
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trav-eltime calculation |
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| PubMed | |
Influences of coarse grid selection on Kirchhoff beam migration
LI Jiabin1, SUN Hui1,2, ZHANG Zhihou1, HAN Fuxing3, LIU Minchen3
1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China;
2. School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China;
3. College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China
Kirchhoff beam migration is a beam migration method,which focuses on rapid imaging of geological structures.Although this imaging method ignores the amplitude information in the calculation process,it can calculate multi-arrival traveltime.This migration method takes into account both imaging accuracy and computa-tional efficiency.Kirchhoff beam migration employs coarse grid techniques in several key steps such as travel-time calculation,weight function calculation,and imaging calculation.The selection of the coarse mesh size has an important influence on the computational efficiency and imaging accuracy of the migration imaging meth-od.This paper will analyze this influence and illustrate the analysis results by the Marmousi data sets.