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Chen H.,Chengdu University of Technology | Chen H.,Key Laboratory of Geomathematics of Sichuan Province | Chen H.,MOE Key Laboratory of Earth Exploration and Information Techniques | He Y.-S.,China National Petroleum Corporation | And 5 more authors.
Xinan Shiyou Daxue Xuebao/Journal of Southwest Petroleum University | Year: 2010

Wave equation prestack depth migration is an effective way to deal with imaging in complex geological structure. Final imaging result is obtained by prestack depth migration, but the migration velocity analysis and AVA / AVO analysis are completed by common imaging point gathers. Common imaging gathers are sensitive to migration velocity which has an effect on the feasibility and the number of iterative convergence of migration velocity analysis. Based on this, the method of extraction of common imaging point gathers during wave field extrapolation by using double square root preserved-amplitude migration operator is presented in the paper. It ensures the energy characteristics of amplitude and is better for AVA/AVO analysis. The sensitivity of common imaging point gathers in offset domain and ray parameter domain to migration velocity can meet the needs and enhance the accuracy of migration velocity analysis.

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