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Seismic Traveltime Tomography in Inhomogeneous Tilted Transversely Isotropic Media  

Jeong, Chang-Ho (SK Energy Co., Ltd.)
Suh, Jung-Hee (Seoul National University)
Publication Information
Geophysics and Geophysical Exploration / v.10, no.4, 2007 , pp. 229-240 More about this Journal
Abstract
In this study, seismic anisotropic tomography algorithm was developed for imaging the seismic velocity anisotropy of the subsurface. This algorithm includes several inversion schemes in order to make the inversion process stable and robust. First of all, the set of the inversion parameters is limited to one slowness, two ratios of slowness and one direction of the anisotropy symmetric axis. The ranges of the inversion parameters are localized by the pseudobeta transform to obtain the reasonable inversion results and the inversion constraints are controlled efficiently by ACB(Active Constraint Balancing) method. Especially, the inversion using the Fresnel volume is applied to the anisotropic tomography and it can make the anisotropic tomography more stable than ray tomography as it widens the propagation angle coverage. The algorithm of anisotropic tomography is verified through the numerical experiments. And, it is applied to the real field data measured at limestone region and the results are discussed with the drill log and geological survey data. The anisotropic tomography algorithm will be able to provide the useful tool to evaluate and understand the geological structure of the subsurface more reasonably with the anisotropic characteristics.
Keywords
seismic velocity anisotropy; anisotropic tomography; pseudo-beta transform; ACB method; Fresnel volume; propagation angle coverage;
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