Simultaneous traveltime inversion using the multi-phase Fresnel volume rays
Li Xingwang
Bai Chaoying
Huang Guojiao
Abstract：Traditional ray tomography method based on high frequency assump-tion is unable to obtain a high resolution tomographic picture with sparse rays. In contrast,the finite-frequency ray theory is more suitable for real seismic propagation law,that is to say that the travel time is dependent not only on the velocity distribution along a central ray (or traditional geometric ray),but also on the velocity anomaly within a region (referred as the first Fresnel volume),which embraces the central ray.In this paper we first put forward an algorithm to calculate the multi-phase Fresnel volume finite-frequency ray,and then give a inversion method to simultaneously invert both velocity and reflector geometry by using these multi-phase arrival time information.In synthetic example,both the traditional ray tomographic and finite-frequency ray tomographic methods are used to simultaneously update both velocity field and reflector geometry with multi-phase arrival times,the results show that the finite-frequency ray to-mographic method is advantageous over the traditional ray tomographic method in terms of velocity reconstruction and reflector geometry updating when the ray density is relatively low.The finite-frequency ray tomographic method with va-rying frequency is a good choice in real seismic tomographic application.
Keywords：the first Fresnel volumefinite frequency raytravel-time sensitivity kernelmulti-phase travel timessimultaneous inversionFresnel volume ray tomography
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：15( 895-909 )