Three-dimensional elastic wave field vector decomposition method and device and computer storage medium

An elastic wave and field vector technology, applied in the field of exploration geophysical data processing and parameter inversion, which can solve problems such as strong crosstalk noise

Active Publication Date: 2020-05-15
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Description
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Problems solved by technology

For example, when using the cross-correlation imaging condition of the components, the aliasing of P-wave and S-wave energy will make the result contain strong crosstalk noise

Method used

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  • Three-dimensional elastic wave field vector decomposition method and device and computer storage medium
  • Three-dimensional elastic wave field vector decomposition method and device and computer storage medium
  • Three-dimensional elastic wave field vector decomposition method and device and computer storage medium

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Embodiment Construction

[0089] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention are clearly and completely described below. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without making creative efforts belong to the protection scope of the present invention.

[0090] In this embodiment, two theoretical models with lateral and depth distances of 520m are established, and the model parameters of the three-dimensional medium are v p = 3.0km / s, v s =1.5km / s, ρ=1.0g / cm 3 . Set the Thomson parameters of different media, the isotropic model is ε=δ=0.0, and the elliptical VTI medium model is ε=δ=0.3. Place the Reker wavelet point source in the center of the model, and after wave field continuation and fast vector decomposition, the app...

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Abstract

The invention relates to a three-dimensional elastic wave field vector decomposition method and device and a computer storage medium. The decomposition method comprises the steps of a, setting model parameters by referring to a PREM geophysical model; b, calculating an elastic parameter Cijkl of a three-dimensional medium by utilizing the model parameters based on a relational expression between amedium elastic parameter and a Thomsen parameter; and c, providing a seismic source, carrying out time iteration ti based on an elastic wave motion equation, carrying out finite difference calculation on stress and displacement according to the model parameters and the elastic parameters in each iteration process to obtain an elastic wave field, and decomposing the elastic wave field by using a vector decomposition method to obtain a P wave field and an S wave field. According to the invention, a pure wave field can be efficiently obtained from a P-wave and S-wave coupled mixed wave field, the influence of the elastic parameters on a constitutive equation under the condition of isotropic and anisotropic VTI media is considered respectively, and an elastic wave decomposition calculation method for different medium characteristics is established.

Description

technical field [0001] The invention relates to a three-dimensional elastic wave field vector decomposition method, a device and a computer storage medium, and belongs to the fields of exploration geophysical data processing and parameter inversion. Background technique [0002] Oil and gas resources are still the most important energy consumption goods in the world today. Increasing the exploration of complex oil and gas reservoirs and improving the recovery of existing oil and gas reservoirs are the key to the development of exploration geophysics at this stage. However, after decades of exploration and development, there are fewer and fewer high-quality oil and gas reservoirs, and traditional oil and gas reservoirs are becoming more and more complex, which greatly increases the cost of exploration and development. In the exploration of complex oil and gas reservoirs, the current high-precision oil and gas exploration needs cannot be met only by using existing technologies...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 左佳卉赵杨杨继东陈海潮
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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