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An inversion method and system of an anisotropic rock physical model

A petrophysical model and anisotropic technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as neglect and differences in clay elastic parameters

Active Publication Date: 2019-04-02
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Clay minerals have complex components and have the characteristics of directional arrangement, which makes the elastic parameters of clay in different regions different. Most of the existing research is based on the clay elastic parameters measured by previous experiments, ignoring its components. Effects of Differences and Orientation

Method used

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  • An inversion method and system of an anisotropic rock physical model
  • An inversion method and system of an anisotropic rock physical model
  • An inversion method and system of an anisotropic rock physical model

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Embodiment

[0135] figure 1 A flowchart showing the steps of an inversion method for an anisotropic rock physics model according to an exemplary embodiment of the present invention.

[0136] Such as figure 1 As shown, the inversion method of a kind of anisotropic petrophysical model of the present embodiment, this inversion method comprises:

[0137] Establish a rock physical model with transverse isotropic elastic characteristics;

[0138] Based on Bayesian theory, obtain the posterior probability distribution;

[0139] Based on the rock physics model and the posterior probability distribution, the objective function of the inversion is established;

[0140] The optimal solution of the fracture density parameter is obtained based on the objective function.

[0141] figure 2 It shows a schematic diagram of establishing a petrophysical model according to an exemplary embodiment of the present invention.

[0142] Such as figure 2 As shown, the establishment of petrophysical models ...

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Abstract

The invention discloses an inversion method and system of an anisotropic rock physical model. The inversion method comprises the following steps of establishing a rock physical model with a transverseisotropic elastic characteristic; based on the Bayesian theory, obtaining the posterior probability distribution; establishing an inversion objective function based on the rock physical model and theposterior probability distribution; and obtaining an optimal solution of the fracture density parameter based on the objective function. The method has the advantages that an anisotropic rock physical modeling method is provided; the influence of anisotropic clay and directionally arranged micro cracks on shale anisotropy can be comprehensively considered, rock physical inversion is carried out on the basis of a Bayesian framework with prior information and logging parameters as constraints, the elastic parameters of clay minerals and the density of the directionally arranged cracks are obtained, and therefore the anisotropy characteristics of the clay minerals are further discussed.

Description

technical field [0001] The invention relates to the technical field of oil and gas geophysics, and more specifically, to an inversion method and system for an anisotropic rock physics model. Background technique [0002] Shale petrophysical modeling aims to establish the relationship between shale composition, structure and filling fluid and its elastic parameters, and further analyze its elastic properties. Shale has a relatively complex mineral composition and structure, which makes the research on shale relatively difficult. The early research on shale petrophysical models can be traced back to Vernik and Nur (1992) and Vernik and Liu (1997), who studied the Bakken shale in North America, which belongs to the organic-rich black shale type, based on the anisotropic Backus average theory. Petrophysical modeling problems. At the same time, Hornby et al. (1994) used the anisotropic self-consistent approximation (SCA) and differential equivalent medium (DEM) theory for shale...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 刘喜武刘宇巍刘志远霍志周张远银钱恪然刘炯
Owner CHINA PETROLEUM & CHEM CORP
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