Nonlinear traveltime tomography of P-SV and P-SH waves
Huang Guangnan1,2,3, Deng Juzhi1, Li Hongxi1, Li Zelin1, Zhang Hua1, Zhang Yibo4
1. Engineering Research Center of Nuclear Technology Application, East China Institute of Technology, Nanchang, Jiangxi 330013, China;
2. Hubei Subsurface Multi-scale Imaging Key Laboratory(SMIL), China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China;
3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
4. GRI, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract:Using anisotropic converted wave ray tracing algorithm, traveltime perturbation equations, and nonlinear conjugate gradient algorithm, we realize in this paper P-SV wave and P-SH wave nonlinear traveltime tomography. After P-SV wave and P-SH wave nonlinear traveltime tomography in blocky abnormal body models, two different sets of inversion results are obtained. The tomograms of c11, c33, and c44 are obtained with P-SV wave traveltime tomography. Meanwhile, the tomograms of c11, c13, c33, and c44 were obtained with P-SH wave traveltime tomography. Inverted elastic modulus parameters obtained by these approaches are very close to that of real theoretical models. Besides, their convergence is also very good. These results confirm the correctness of the nonlinear traveltime inversion algorithms of P-SV wave and P-SH wave.
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