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A full waveform inversion method and system based on gradient processing

A full waveform inversion and gradient technology, applied in the field of geological exploration, can solve the problems of large amount of calculation, cumbersome calculation process, and difficulty in obtaining prior information, so as to achieve the effect of stable inversion and improved inversion accuracy

Active Publication Date: 2018-08-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods in the prior art are calculated in the data domain, which introduces errors into the target functional, resulting in a large amount of calculation and cumbersome calculation process
Moreover, it is difficult to obtain accurate prior information in actual production

Method used

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  • A full waveform inversion method and system based on gradient processing
  • A full waveform inversion method and system based on gradient processing
  • A full waveform inversion method and system based on gradient processing

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Experimental program
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Embodiment 1

[0055] figure 1 It is a flow chart of the steps of the full waveform inversion gradient processing method of this embodiment.

[0056] First, in step S101, the data residuals are determined from the calculated data obtained from the forward modeling of the initial velocity model and the field observation data. This data residual is expressed in the form of a least squares objective function:

[0057]

[0058] Among them, △d is the residual vector, that is, based on the initial velocity model m 0 The difference between the calculated data and the seismic data. The superscript + indicates an adjoint operator.

[0059] Then step S102 is executed to obtain the gradient field according to the backpropagation wavefield of the data residual in the initial velocity model and the forward wavefield obtained from the forward modeling.

[0060] Among them, the backward propagation wave field is the wave field data of the data residual at the receiver point in the initial velocity m...

Embodiment 2

[0091] This embodiment provides a full waveform inversion system based on gradient processing. Such as Figure 9 As shown, the system includes a residual calculation module 91 , a gradient calculation module 92 , a disturbance model calculation module 93 and an update module 94 .

[0092] Wherein, the residual calculation module 91 determines the data residual from the calculation data obtained by the forward modeling of the initial velocity model and the field observation data. The gradient calculation module 92 is connected with the residual calculation module 91, and is used to obtain the gradient field according to the backward wave field of the data residual in the initial velocity model and the forward wave field obtained by forward modeling. The disturbance model calculation module 93 filters the gradient field to obtain a velocity disturbance model that preserves formation boundary information. The update module 94 updates the initial velocity model according to the ...

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Abstract

The invention discloses a full waveform inversion method and system based on gradient processing. The method includes: a residual calculation step, determining the data residual from the calculation data obtained by the forward modeling of the initial velocity model and field observation data; The gradient field is obtained from the forward wave field; the disturbance model calculation step is to filter the gradient field to obtain a velocity disturbance model that retains formation boundary information; the update step is to update the initial velocity model according to the velocity disturbance model. The present invention performs low-pass and self-adaptive twice filtering on the gradient in full waveform inversion, suppresses random noise through low-pass filtering, and recovers the boundary information lost in the process of low-pass filtering through adaptive filtering, so as to achieve boundary fidelity Effect.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a full waveform inversion method and system based on gradient processing. Background technique [0002] In recent years, the full-wave inversion theory has been widely concerned in the field of geological exploration. Full-wave inversion can improve conventional seismic resolution and obtain optimized data, improve the ability to evaluate geological resources, thereby determining recoverable areas and making favorable well location suggestions. Since geological exploration targets not only complex surface geological conditions, but also complex underground geological structures, it is very important to improve the inversion accuracy and obtain quantitative reservoir characterization parameters. [0003] The quality of land seismic data in the prior art is poor, and the noise interference is serious. The existence of noise makes the gradient in the calculation pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/36G06F19/00
Inventor 胡光辉王立歆方伍宝贺剑波王杰
Owner CHINA PETROLEUM & CHEM CORP
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