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VTI equivalent medium crack weakness parameter seismic inversion method and system

A seismic inversion, equivalent medium technology, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve problems such as large amount of calculation, cumulative error, failure to consider fracture-induced anisotropy effects, etc., to achieve stability Good and reliable inversion, to achieve the effect of fine description and characterization

Active Publication Date: 2021-12-03
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

The precise Zoeppritz equation and full waveform inversion method can use rich pre-stack seismic information to predict model parameters, but the calculation is huge, and it cannot meet the requirements of fine characterization of actual reservoirs in terms of inversion scale and calculation efficiency, especially for Actual 3D seismic data
For the VTI equivalent medium model, the traditional approximate reflection coefficient equation based on the Zoeppritz equation is a five-term model parameter expression including elastic parameters and anisotropic parameters, which causes ill-conditioned inversion problems that limit the application of the method
The traditional approach to this problem is to approximately rewrite the original equations to reduce the number of unknown parameters, but the effects of fracture-induced anisotropy are not considered
In addition, the elastic parameters obtained by conventional inversion are difficult to directly describe the fracture development characteristics of shale gas reservoirs, while other reservoir characteristic parameters calculated indirectly will introduce cumulative errors

Method used

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  • VTI equivalent medium crack weakness parameter seismic inversion method and system
  • VTI equivalent medium crack weakness parameter seismic inversion method and system
  • VTI equivalent medium crack weakness parameter seismic inversion method and system

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Experimental program
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Embodiment 1

[0052] This embodiment provides a method for seismic inversion of fracture weakness parameters in VTI equivalent media;

[0053] Such as figure 1 As shown, a seismic inversion method of VTI equivalent medium fracture weakness parameters, including:

[0054] S101: Obtain seismic data of the work area to be studied; the seismic data includes: pre-stack angle gather;

[0055] S102: Obtain the actual well logging curve of the work area to be studied; the actual well logging curve is the well logging curve of elastic characteristic parameters and fracture weakness;

[0056] S103: smoothing the actual logging curve of the work area to be studied to obtain an initial model for the inversion of elastic parameters and fracture weakness parameters;

[0057] S104: According to the initial model inversion of the elastic parameters and fracture weakness parameters, using scattering theory and weak anisotropy approximation assumptions, obtain the new property parameters to be estimated; w...

Embodiment 2

[0128] This embodiment provides a seismic inversion system for VTI equivalent medium fracture weakness parameters;

[0129] A seismic inversion system for VTI equivalent medium fracture weakness parameters, including:

[0130] The first acquisition module is configured to: acquire seismic data of the work area to be studied; the seismic data includes: pre-stack angle gather;

[0131] The second acquisition module is configured to: acquire the actual well logging curve of the work area to be studied; the actual well logging curve is the well logging curve of elastic characteristic parameters and fracture weakness;

[0132] A smoothing processing module, which is configured to: perform smoothing processing on the actual logging curve of the work area to be studied to obtain an initial model for the inversion of elastic parameters and fracture weakness parameters;

[0133] A parameter calculation module, which is configured to: obtain new property parameters to be estimated acco...

Embodiment 3

[0139] This embodiment also provides an electronic device, including: one or more processors, one or more memories, and one or more computer programs; wherein, the processor is connected to the memory, and the one or more computer programs are programmed Stored in the memory, when the electronic device is running, the processor executes one or more computer programs stored in the memory, so that the electronic device executes the method described in Embodiment 1 above.

[0140] It should be understood that in this embodiment, the processor can be a central processing unit CPU, and the processor can also be other general-purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate array FPGA or other programmable logic devices , discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, o...

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Abstract

The invention discloses a VTI equivalent medium crack weakness parameter seismic inversion method and system. The method comprises the following steps: acquiring seismic data of a to-be-researched work area; acquiring an actual logging curve of the to-be-researched work area, wherein the actual logging curve is a logging curve of the elastic characteristic parameters and the fracture weakness; smoothing the actual logging curve of the to-be-researched work area to obtain an initial model of elastic parameter and crack weakness parameter inversion; according to the initial model of the elastic parameter and crack weakness parameter inversion, obtaining a to-be-estimated new attribute parameter by using a scattering theory and a weak anisotropy approximate hypothesis condition; and according to seismic data of a to-be-researched work area, based on a Bayesian inversion theory, performing seismic inversion on the to-be-estimated new attribute parameter to obtain an elastic modulus and a fracture parameter of the shale gas reservoir. According to the method, the reservoir elasticity modulus and the fracture weakness parameter can be reasonably and reliably obtained from the pre-stack seismic data, so that fine description and depiction of shale gas reservoir features are realized.

Description

technical field [0001] The invention relates to the technical field of seismic inversion, in particular to a VTI (Vertically Transverse Isotropy, transverse isotropy with vertical symmetry axis) equivalent medium fracture weakness parameter seismic inversion method and system. Background technique [0002] The statements in this section merely mention the background technology related to the present invention and do not necessarily constitute the prior art. [0003] The horizontal thin interbed structure of shale gas reservoirs or the horizontal bedding with obvious anisotropy characteristics can be equivalent to VTI media. A large number of scholars have shown that the anisotropy induced by horizontal bedding fractures in shale gas reservoirs will seriously affect the seismic reflection response. In order to guide the identification and description of the anisotropy characteristics of shale gas reservoirs, it is particularly important to establish the relationship between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/307
Inventor 潘新朋赵志者葛子建王璞张鹏飞柳建新崔益安
Owner CENT SOUTH UNIV
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