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Three-dimensional frequency-domain full-acoustic imaging method and device

A technology of frequency domain and acoustic wave equation, applied in the field of three-dimensional frequency domain full acoustic wave imaging method and device, can solve the problems of numerical dispersion, false fluctuation, full waveform inversion and easy to fall into local minimum, etc., to suppress numerical dispersion Effect

Active Publication Date: 2020-12-11
TSINGHUA UNIV
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Problems solved by technology

[0006] The purpose of one or more embodiments of this specification is to provide a three-dimensional frequency-domain full-waveform acoustic wave imaging method and device, which are used to solve the serious numerical frequency problems existing in the frequency-domain forward modeling of the existing full-waveform acoustic wave imaging methods. Scatter (pseudo-fluctuation) problem, and easy to fall into local minimum when full waveform inversion

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Embodiment Construction

[0049] One or more embodiments of this specification provide a three-dimensional frequency-domain full-waveform acoustic wave imaging method and device, which are used to solve the serious numerical dispersion (pseudo Fluctuation) problem, and the problem that it is easy to fall into the local minimum when inverting the full waveform.

[0050] In order to enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the following will describe the technical solutions in one or more embodiments of this specification in conjunction with the drawings in one or more embodiments of this specification The technical solution is clearly and completely described, and obviously, the described embodiments are only a part of the embodiments in this specification, rather than all the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by persons of ordinary skill in the art with...

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Abstract

One or more embodiments of the invention disclose a three-dimensional frequency-domain full-waveform acoustic wave imaging method and device, thereby solving a problem of serious numerical frequency dispersion existing in a common differential method during frequency domain forward modeling in the existing full-waveform acoustic wave imaging method and a problem that a local minimum value is easyto fall into during full-waveform inversion. The method comprises the following steps: determining a frequency domain acoustic wave equation containing the following parameters: a frequency domain wave field, an angular frequency of sound wave propagation, a spatial position coordinate, a frequency domain seismic source and a sound wave propagation speed under a three-dimensional homogeneous medium; ; acquiring an initial model for performing full-acoustic-wave inversion on the frequency domain sound waves, and determining an objective function of the full-acoustic-wave inversion according tothe initial model; according to the frequency domain acoustic wave equation and a forward modeling result of a real model corresponding to the frequency domain acoustic wave equation by utilizing an approximate analysis discretization NAD method, inverting the objective function to obtain target model parameters; and determining a target inversion model according to the target model parameters.

Description

technical field [0001] This specification relates to the technical field of seismic exploration, in particular to a three-dimensional frequency-domain full-acoustic imaging method and device. Background technique [0002] Computational geophysics is a discipline that studies the earth and its space where living things live. It involves mathematics, physics, geology, atmospheric science, ocean science, and astronomy. Directions closely related to mathematics include seismic wave propagation forward modeling method and its wave field simulation, wave propagation theory and numerical calculation method in fluid-containing porous media, seismic anisotropy theory, signal processing in seismic exploration, seismic tomography Imaging, seismic migration and its application research, numerical solution of partial differential equations and its application, optimization theory and data mining, etc. Among them, the geophysical inversion problem refers to the theory and method of deduc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 张德耀杨顶辉
Owner TSINGHUA UNIV
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