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A shale reservoir brittleness and anisotropy parameter prediction method and system

An anisotropic, shale reservoir technology, used in measurement devices, geophysical measurements, seismology, etc., can solve the problems of ill-conditioned inversion, too many unknown parameters, and inability to directly estimate rock mechanical parameters, and achieve improved stability. performance and precision, high computational efficiency, and good industrial production application value

Active Publication Date: 2022-07-01
CENT SOUTH UNIV
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Problems solved by technology

[0006] In order to solve the problem that in the prediction of shale reservoir brittleness and anisotropy parameters in VTI medium, there are too many unknown parameters in the traditional approximate reflection coefficient based on Zoeppritz equation, resulting in ill-conditioned inversion, and the problem that rock mechanics parameters cannot be directly estimated, the present invention The first aspect provides a method for predicting brittleness and anisotropy parameters of shale reservoirs, which can meet the requirements of seismic prestack inversion for the prediction of brittleness and anisotropy characteristics of VTI shale reservoirs

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  • A shale reservoir brittleness and anisotropy parameter prediction method and system
  • A shale reservoir brittleness and anisotropy parameter prediction method and system
  • A shale reservoir brittleness and anisotropy parameter prediction method and system

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Embodiment 1

[0063] This embodiment provides a method for predicting brittleness and anisotropy parameters of a shale reservoir.

[0064] For the prediction of brittleness and anisotropy parameters of shale reservoirs in VTI medium, there are too many unknown parameters in the traditional approximate reflection coefficient based on the Zoeppritz equation, resulting in ill-conditioned inversion, and the rock mechanical parameters cannot be directly estimated. A method for evaluating brittleness and anisotropy parameters of shale reservoirs in AVO inversion in VTI media. Using the elastic wave inverse scattering theory, the Born approximation and the stationary phase method, the seismic wave reflection coefficient equation of the VTI medium based on the modulus of the longitudinal and shear waves is derived, and the quantitative relationship between the modulus of the longitudinal and shear waves, the Young's modulus and the Poisson's ratio is used to calculate the above The equation is equi...

Embodiment 2

[0128] This embodiment provides a shale reservoir brittleness and anisotropy parameter prediction system, including:

[0129] Seismic wavelet determination module, used to collect logging data in the work area, and determine seismic wavelets based on the collected logging data;

[0130] The three-attribute parameter determination module is used to construct the VTI medium reflection coefficient equation with three-attribute parameters, and determine the three-attribute parameters;

[0131] A priori distribution function and an initial three-attribute parameter model acquisition module, used to obtain a priori distribution function and an initial three-attribute parameter model based on logging data and three-attribute parameters;

[0132] The inversion residual determination module is used to determine the inversion residual according to the initial three-attribute parameter model and seismic wavelet;

[0133] The inversion objective function building module is used to constr...

Embodiment 3

[0137] This embodiment also provides an electronic device, including a memory, a processor, and computer instructions stored in the memory and executed on the processor, and when the computer instructions are executed by the processor, the steps of the method described in Embodiment 1 are completed. .

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Abstract

The invention discloses a method and system for predicting brittleness and anisotropy parameters of shale reservoirs. This method uses the elastic wave inverse scattering theory, the Born approximation and the stationary phase method to deduce the seismic wave reflection coefficient equation of the VTI medium based on the modulus of the longitudinal and shear waves, and uses the quantitative relationship between the modulus of the longitudinal and shear waves, the Young's modulus and the Poisson's ratio. The above equation is equivalently rewritten as the VTI medium reflection coefficient equation based on rock mechanical parameters; by integrating and simplifying the equation, a linear reflection coefficient equation with new three-attribute parameters is obtained; under the Bayesian framework, a new VTI medium is proposed. The three-attribute parameter linear inversion method realizes the accurate prediction of new attribute parameters, and finally realizes the prediction of brittleness and anisotropy parameters of shale reservoirs.

Description

technical field [0001] The invention belongs to the field of oil and gas and shale gas exploration seismic and rock mechanics parameter prediction, and particularly relates to a method and system for predicting brittleness and anisotropy parameters of shale reservoirs. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Seismic inversion is an effective method to obtain internal images of subsurface media and to describe reservoirs finely. It is also the final form of high-resolution seismic exploration. Seismic data inversion greatly improves the value of reservoir characterization. As the focus of seismic research gradually shifts from exploration to development, and from conventional oil and gas to unconventional oil and gas, especially shale gas, seismic inversion and other means are used to reveal the fine distribution characteristics of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624G01V2210/626
Inventor 潘新朋葛子建李磊张大洲柳建新
Owner CENT SOUTH UNIV
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