Method and device for full-wave-shape inversion

A technology of full waveform inversion and wave equation, which is applied in seismic signal processing and other directions, and can solve problems such as low calculation efficiency

Active Publication Date: 2013-05-08
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

In this way, the calculation efficiency is relatively low

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  • Method and device for full-wave-shape inversion

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[0094] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0095] figure 1 It is a processing flowchart of the full waveform inversion method based on the first-order velocity-stress elastic wave equation in the time domain in the embodiment of the present invention. Such as figure 1 As shown, the full waveform inversion method based on the first-order velocity-stress elastic wave equation in the time domain in the embodiment of the present invention may include:

[0096] Step 101, using the adjoint method based on the perturbation theory to determine the adjoint equation of the first-order velocity-stress elastic wave equa...

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Abstract

The invention discloses a method and a device for full-wave-shape inversion based on a time domain-step velocity-stress elastic wave equation, wherein the method includes: adopting an adjoint method based on the perturbation theory, and confirming the adjoint equation of the time domain-step velocity-stress elastic wave equation and a corresponding gradient expression, in regard to model parameters, of an objective functional; conforming a forward-propagating wave field according to the time domain-step velocity-stress elastic wave equation, and conforming an inverse time extrapolation adjoint wave field according to the adjoint equation; confirming the gradient, in regard to the model parameters, of the objective functional according to the forward-propagating wave field, the inverse time extrapolation adjoint wave field and the gradient expression; and using a gradient iterative algorithm to carry out multi-scale full-wave-shape inversion. According to the method for the full-wave-shape inversion, before transmitted in an inverse-time mode, a wave field residual error does not need pretreatment, the conversion problems of particle velocity and particle displacement do not need to be considered, and inversion calculation efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of petroleum seismic exploration velocity modeling, in particular to a full waveform inversion method and device based on the first-order velocity-stress elastic wave equation in the time domain. Background technique [0002] Compared with the travel-time tomography method, the full waveform inversion can not only use the seismic travel time, but also use the amplitude, phase, waveform and other information, so it can obtain an accurate high-resolution velocity model. With the deepening of exploration, the problems to be solved in seismic imaging are becoming increasingly refined and complex. It is far from enough to infer the underground medium model solely by the P-wave information. In order to better infer the underground medium model, it is necessary to provide elastic multi-wave Imaging information, so elastic wave full waveform inversion is very important. [0003] Full waveform inversion is a method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 周辉王杰张红静张庆臣
Owner BC P INC CHINA NAT PETROLEUM CORP
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