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《应用地球物理(英文版)》 2008-04
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Elastic Kirchhoff migration of vectorial wave-fields

Du Qizhen1, 2 and Hou Bo11. School of Earth Resource and information, China University of petroleum (East China), Dongying 257061, China. 2. CNPC Key Laboratory of Geophysical Exploration, China University of petroleum (Beijing), Beijing 102202, China.  
Based on Kuo and Dai’s vectorial wave-field extrapolation equations, we derive new Kirchhoff migration equations by introducing unit vectors which represent the ray directions at the imaging points of the reflected P- and PS converted-waves. Furthermore, using the slope of the events on shot records and a ray racing procedure, mirror-image reflection points are found and the reflection data are smeared along the Fresnel zone. The migration method proposed in this paper solves two troublesome imaging problems caused by limited receiving aperture and migration artifacts resulting from wave propagation at the velocities of non original wave type. The migration method is applied successfully with model data, demonstrating that the new method is effective and correct.
【Fund】: supported by National High-Tech Research and Development Program of China (Grant No. 2006AA06Z202);; Open Fund of the Key Laboratory of Geophysical Exploration of CNPC (Grant No. GPKL0802);; CNPC Young Innovation Fund (Grant No. 05E7028) ;; graduate student Innovation Fund of China University of Petroleum(East China) (Grant No. S2008-1);; the Program for New Century Excellent Talents in University (Grant No. NCET-07-0845).
【CateGory Index】: P631.4
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