Elastic wave least squares reverse time migration system and method based on wavefield separation

A technology of wave field separation and reverse time migration, applied in the field of petroleum exploration, can solve the problems of inaccurate simulation of seismic wave propagation law, inability to obtain, crosstalk noise, etc.

Active Publication Date: 2018-12-04
中国地质科学院地球物理地球化学勘查研究所 +1
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Problems solved by technology

The traditional acoustic wave approximation cannot accurately simulate the propagation law of seismic waves, and it is also impossible to obtain the correct image.
[0003] The least squares method can overcome the shortcomings of low frequency noise, low deep imaging energy, unbalanced amplitude energy, and low resolution in the traditional migration imaging method. Therefore, we will develop the elastic wave least squares reverse time migration method, but in In the traditional least squares reverse time migration method, because multiple parameters interfere with each other, it will cause crosstalk noise

Method used

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  • Elastic wave least squares reverse time migration system and method based on wavefield separation
  • Elastic wave least squares reverse time migration system and method based on wavefield separation
  • Elastic wave least squares reverse time migration system and method based on wavefield separation

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Embodiment 1

[0078] Such as Figure 9 As shown, the elastic wave least squares reverse time migration system based on wave field separation includes model input module, forward simulation module, actual seismic data input module, wave field backpropagation module, reverse time migration module, reverse migration module Module, gradient update module and result output module, if the conditions are not satisfied, the gradient update direction based on wave field separation is obtained, and the imaging profiles of the longitudinal and shear wave velocity components are updated; if the conditions are met, the final imaging profiles are output;

[0079] a model input module configured to input a compressional and shear wave migration velocity field model and a slowness disturbance model;

[0080] a forward modeling module configured to perform elastic wave forward modeling and wave field separation;

[0081] an actual seismic data input module configured to input multi-component actual shot re...

Embodiment 2

[0088] On the basis of the above embodiments, the present invention also mentions an elastic wave least squares reverse time migration method based on wave field separation, the flow chart of which is as follows figure 1 As shown, it specifically includes the following steps:

[0089] Step 1: Input the P / S wave migration velocity field model and slowness perturbation model through the model input module, and establish the observation system;

[0090] Step 2: Perform elastic wave forward modeling and wave field separation through the forward modeling module using the elastic wave velocity-stress equation based on wave field separation as shown in the following formula;

[0091]

[0092]

[0093]

[0094] Among them, (1) is the mixing equation, (2) is the P wave equation, (3) is the S wave equation, v x and v z are the velocities of the horizontal and vertical components, respectively, τ xx and τ zz is the normal stress, τ xz is the shear stress, t is the time, (x,...

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Abstract

The invention discloses a wave field separation-based elastic wave least squares inverse time migration system and method and belongs to the petroleum exploration field. According to the wave field separation-based elastic wave least squares inverse time migration system and method, multi-parameter imaging can be performed by using multi-component seismic exploration data; a wave field separation-based least squares migration operator and reverse migration operator as well as a wave field separation-based gradient formula are provided, and therefore, the defect of imaging noises of a traditional elastic wave inverse time migration imaging method can be eliminated, and a real-amplitude multi-component imaging profile can be obtained; crosstalk noises caused by mutual influence between vertical and horizontal waves can be suppressed; and the wave field separation-based elastic wave least squares inverse time migration technologies are developed so as to provide a high-precision imaging foundation for the follow-up interpretation work of the seismic data of multi-component seismic exploration.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, and in particular relates to an elastic wave least squares reverse time migration system and method based on wave field separation. Background technique [0002] Multi-component seismic exploration technology can make full use of the information of compressional and shear waves and converted waves, and can perform more accurate imaging of underground structures, so it has also received extensive attention and application. The traditional acoustic wave approximation cannot accurately simulate the propagation of seismic waves, and thus cannot obtain a correct image. [0003] The least squares method can overcome the shortcomings of low frequency noise, low deep imaging energy, unbalanced amplitude energy, and low resolution in the traditional migration imaging method. Therefore, we will develop the elastic wave least squares reverse time migration method, but in In the traditional least square...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30G06F17/11
CPCG01V1/282G01V1/301G06F17/11
Inventor 李金丽刘建勋曲英铭李振春王凯
Owner 中国地质科学院地球物理地球化学勘查研究所
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