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《应用地球物理(英文版)》 2010-04
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Optimized nonhyperbolic moveout correction equation of long-offset seismic data for TI media with an arbitrary spatial orientation

Hao Chong-Tao,Yao Chen,and Zhang Jian-Zhong 1.Institute of Geology,China Seismological Bureau,Beijing 100029,China. 2.Seismological Bureau of Inner Mongolia,Hohhot 010051,China.  
The conventional long-offset nonhyperbolic moveout equation is derived for the transverse isotropic media with a vertical symmetric axis(VTI).It cannot be extended to the transverse isotropic media with an arbitrary spatial orientation of symmetry axis(ATI).In this paper,we optimize a modified long-offset nonhyperbolic moveout equation for ATI media based on the conventional nonhyperbolic moveout equation and the exact analytical solution of the quartic moveout coefficient(A_4) and NMO velocity for ATI media that were derived in our previous work.Compared with the exact traveltimes of the ray-tracing algorithm for anisotropic media,this optimized equation can be used to calculate the traveltime varying with survey line azimuth in arbitrary strong or weak ATI media.It can replace the time-consuming, multi-offset,and multi-azimuth ray tracing method for forward modeling of long-offset reflection traveltimes in ATI media,which is useful to further anisotropic parameter inversion using long-offset nonhyperbolic moveout.
【Fund】: the National Natural Science Foundation of China(Grant No.40874028);; the Special Fund (Grant No.2008ZX05008-006-004).
【CateGory Index】: P631.4
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