西南石油大学学报(自然科学版) ›› 2010, Vol. 32 ›› Issue (3): 35-40.DOI: 10.3863/j.issn.1674-5086.2010.03.007

• 地质勘探 • Previous Articles     Next Articles

SENSITIVITY ANALYSIS OF COMMON IMAGE GATHERS BASED ON PRESERVED AMPLITUDE CONTINUATION OPERATOR

CHEN Hui1a，1b HE Yu-shan2 LI Lu-ming1b LUO Sheng-xian1bZHAO An-jun3   

  1. 1.Chengdu University of Technology：a.Key Lab of Geomathematics of Sichuan Province，b.MOE Key Lab of Earth-exploration and Information Techniques，Chengdu Sichuan 610059，China；2.Research Institute， No.1 Geophysical Exploration Company，Daqing Drilling and Exploration Engineering Corporation，CNPC，Daqing Heilongjaing 163357，China；3.Department of Exploration，Huabei Oilfield Company，CNPC，Renqiu Hebei 062550，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-06-20 Published:2010-06-20

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Abstract: 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.

Key words: preserved amplitude continuation operator, common image gathers, wave equation, prestack depth migration, sensitivity analysis

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