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visco-acoustic transmission waveform inversion of velocity structure in space-frequency domain

Earthquake Science 2009年第1期22卷 45-52页

作者： Guihua Long Xiaofan Li Meigen Zhang Tong Zhu Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

According to the least square criterion of minimizing the misfit between modeled and observed data, this paper provides a preconditioned gradient method to invert the visco-acoustic velocity structure on the basis of using sparse matrix LU factorization technique to directly solve the visco-acoustic wave forward problem in space-frequency domain. Numerical results obtained in an inclusion model inversion and a layered homogeneous model inversion demonstrate that different scale media have their own frequency responses, and the strategy of using low-frequency inverted result as the starting model in the high-frequency inversion can greatly reduce the non-tmiqueness of their solutions. It can also be observed in the experiments that the fast convergence of the algorithm can be achieved by using diagonal elements of Hessian matrix as the preconditioned operator, which fully incorporates the advantage of quadratic convergence of Gauss-Newton method.

关键词： visco-acoustic waveform inversion LU factorization preconditioned operator

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Seismic wave imaging in visco-acoustic media

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Science China Mathematics 2004年第Z1期47卷 146-154页

作者： WANG Huazhong ZHANG Libin MA Zaitian School of Ocean and Earth Science Tongji University Shanghai 200092 China School of Ocean and Earth Science Tongji University Shanghai 200092 China School of Ocean and Earth Science Tongji University Shanghai 200092 China

Realistic representation of the earth may be achieved by combining the mechanical properties of elastic solids and viscousliquids. That is to say, the amplitude will be attenuated withdifferent frequency and the phase will be changed in the seismicdata acquisition. In the seismic data processing, this effect mustbe compensated. In this paper, we put forward a visco-acoustic wavepropagator which is of better calculating stability and tolerablecalculating cost (little more than an acoustic wave propagator).The quite good compensation effect is demonstrated by thenumerical test results with synthetic seismic data and real data.

关键词： seismic wave dissipation, visco-acoustic wave equation,seismic wave imaging.

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Quantifying the Effects of Near-Surface viscosity on Seismic Acquisition Geometry: A case study from Chepaizi Exploration Area, Junggar Basin (NW China)

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Applied Geophysics 2024年第3期21卷 433-439,616页

作者： Hongqin Ren Tao Liu Xu Zhang Jian Zhang Renwei Ding Shengli Branch Sinopec Geophysical Co.Ltd.Shandong Dongying 257086China College of Earth Science and Engineering Shandong University of Science and TechnologyShandong Qingdao 266590China

The Chepaizi Exploration Area,Junggar Basin(NW China)holds substantial importance for seismic exploration endeavors,yet it poses notable challenges due to the intricate nature of its subsurface and near-surface *** address these challenges,we introduce a novel and comprehensive workflow tailored to evaluate and optimize seismic acquisition geometries while considering the impacts of near-surface *** integrating geological knowledge,historical seismic data,and subsurface modeling,we conduct simulations employing the visco-acoustic wave equation and reverse-time migration to produce detailed subsurface *** quality of these images is quantitatively evaluated using a local similarity metric,a pivotal tool for evaluating the accuracy of seismic *** culmination of this workflow results in an automated optimization strategy for acquisition geometries that enhances subsurface *** proposed methodology underscores the importance of incorporating near-surface viscosity effects in seismic imaging,offering a robust framework for improving the accuracy of subsurface ***,we aim to contribute to the advancement of seismic imaging methodologies by providing valuable insights for achieving high-quality seismic exploration outcomes in regions characterized by complex subsurface and near-surface conditions.

关键词： seismic acquisition visco-acoustic reverse-time migration local similarity

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