Effective Elliptic Models for Efficient Wavefield Extrapolation in Anisotropic Media
Type
Conference PaperKAUST Department
Earth Science and Engineering ProgramKAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Seismic Wave Analysis Group
Date
2014-05-22Online Publication Date
2014-05-22Print Publication Date
2014Permanent link to this record
http://hdl.handle.net/10754/333063
Metadata
Show full item recordAbstract
Wavefield extrapolation operator for elliptically anisotropic media offers significant cost reduction compared to that of transversely isotropic media (TI), especially when the medium exhibits tilt in the symmetry axis (TTI). However, elliptical anisotropy does not provide accurate focusing for TI media. Therefore, we develop effective elliptically anisotropic models that correctly capture the kinematic behavior of the TTI wavefield. Specifically, we use an iterative elliptically anisotropic eikonal solver that provides the accurate traveltimes for a TI model. The resultant coefficients of the elliptical eikonal provide the effective models. These effective models allow us to use the cheaper wavefield extrapolation operator for elliptic media to obtain approximate wavefield solutions for TTI media. Despite the fact that the effective elliptic models are obtained by kinematic matching using high-frequency asymptotic, the resulting wavefield contains most of the critical wavefield components, including the frequency dependency and caustics, if present, with reasonable accuracy. The methodology developed here offers a much better cost versus accuracy tradeoff for wavefield computations in TTI media, considering the cost prohibitive nature of the problem. We demonstrate the applicability of the proposed approach on the BP TTI model.Citation
Waheed, U., & Alkhalifah, T. (2014). Effective Elliptic Models for Efficient Wavefield Extrapolation in Anisotropic Media. Proceedings 76th EAGE Conference and Exhibition 2014. doi:10.3997/2214-4609.20140813Publisher
EAGE PublicationsConference/Event name
76th EAGE Conference & Exhibition 2014ae974a485f413a2113503eed53cd6c53
10.3997/2214-4609.20140813