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Full waveform inversionmethod 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, and achieve the effect of stable inversion and improved inversion accuracy

Active Publication Date: 2016-03-30
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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  • Full waveform inversionmethod and system based on gradient processing
  • Full waveform inversionmethod and system based on gradient processing
  • Full waveform inversionmethod and system based on gradient processing

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Experimental program
Comparison scheme
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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] C ( m ) = 1 2 [ L 2 ( Δd ) ] = 1 2 Δd + Δd - - - ( 1 )

[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 sei...

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 (FWI) method and system based on gradient processing. The method comprises a residual calculation step of determining a data residual according to calculation data and outdoor observation data obtained by the forward modeling of an initial velocity model; a gradient calculation step of solving a gradient field according to a backward wave field of the data residual in the initial velocity model and a forward wave field obtained by forward modeling; a disturbance model computing steps of filtering the gradient field to obtain a velocity disturbance model with reserved stratum boundary information; and an updating step of updating the initial velocity model according to the velocity disturbance model. The method carries out low-pass filtering and adaptive filtering on the gradient in the FWI, suppresses random noise by means of the low-pass filtering, and recovers the boundary information lost in the low-pass filtering so as to achieve boundary fidelity.

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 Applications(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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