基于方位—反射角度道集的高斯束层析速度建模方法及实现

doi:10.11720/wtyht.2018.1137

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Abstract

Tomography is one of the most important velocity building methods.Travel time tomography in image domain, implemented with migration, is widely used in velocity model building currently. The authors first introduced the method to output the azimuth-reflection angle gathers, and then, under the assumption of the first-order Born and Rytov approximation of wave equation,started with the imaging condition of Gaussian Beam Migration to derive the linear relation between traveltime perturbation and velocity perturbation in the image domain,with which the authors constructed the explicit expression of kernel function for the wave equation traveltime tomography and established the traveltime tomography equation.The key to computing the kernel is how to compute the Green function in the background model.Making use of the Gaussian beam propagation operator to compute the kernel function can be flexible and efficient.Together with the implementation of Gaussian beam propagation operator in migration,the authors truly realized the integrated technological process of velocity building and migration.Numerical tests and field data application demonstrate that the Gaussian-beam-propagator based traveltime tomography in image domain is effective.

Key words： Gaussian beam traveltime tomography kernel function migration angle gathers

Received: 24 August 2017 Published: 24 October 2018

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Jie-Xiong CAI. Method and application of Gaussian beam velocity tomography based on azimuth-reflection angle domain common imaging gathers[J]. Geophysical and Geochemical Exploration, 2018, 42(5): 977-989.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2018.1137 OR https://www.wutanyuhuatan.com/EN/Y2018/V42/I5/977

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