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Shale anisotropic petrophysical model modeling method

A petrophysical model and anisotropic technology, applied in the field of petrophysical model modeling, can solve problems such as shale microstructure characteristics and clay mineral orientation are not considered

Active Publication Date: 2020-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most domestic shale petrophysical models do not consider the orientation of clay minerals, adding clay minerals to the model as an isotropic medium, and do not consider the microstructural characteristics of shale.

Method used

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  • Shale anisotropic petrophysical model modeling method
  • Shale anisotropic petrophysical model modeling method
  • Shale anisotropic petrophysical model modeling method

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Embodiment 1

[0078] figure 2 A schematic modeling diagram of a method for modeling an anisotropic petrophysical model of shale according to an embodiment of the present invention is shown.

[0079] Such as figure 2 As shown, 1) First, the elastic properties of brittle minerals are simulated by the Hashin-Shtrikman boundary model in the case of isotropic mixing. Since brittle minerals such as quartz, feldspar, calcite, dolomite, and pyrite can all be regarded as rigid minerals, The elastic properties are relatively close, and this model can be used for mixing;

[0080] 2) Addition of brittle mineral pores: The brittle minerals in the Longmaxi Formation shale are distributed with intergranular pores and intragranular dissolution pores, and most of them are disconnected pores. The pore diameter and aspect ratio of such pores are usually large, but the content is small. Therefore, the isotropic differential equivalent medium model (isotropic DEM model) can be added to the brittle mineral m...

Embodiment 2

[0095] This embodiment specifically illustrates the shale anisotropic rock physical model modeling method of the present invention through three major steps of calculation of shale rock matrix parameters, calculation of shale dry rock skeleton parameters and calculation of shale saturated rock parameters.

[0096] image 3 A schematic diagram of obtaining shale rock matrix parameters in the method for modeling an anisotropic rock physical model of shale according to an embodiment of the present invention is shown. Figure 4 It shows a schematic diagram of obtaining shale dry rock skeleton parameters in the shale anisotropic petrophysical model modeling method according to an embodiment of the present invention. Figure 5 It shows a schematic diagram of obtaining shale saturated rock parameters in the shale anisotropic rock physical model modeling method according to an embodiment of the present invention. Among them, HS represents the Hashin-Shtrikman boundary theory model, a...

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Abstract

The invention discloses a shale anisotropic rock physical model modeling method, which includes treating the shale matrix as a mixture composed of brittle minerals, organic matter and clay; treating clay particles as anisotropic particles with a fixed elastic stiffness matrix. Anisotropy elements are used to introduce the clay particle orientation index to characterize the degree of directional arrangement of clay particles; the total pores of shale are divided into three types of pores: brittle pores, clay pores and organic matter pores; the elastic parameters of the mixture of pore-containing brittle minerals and pore-containing organic matter are obtained; Obtain the elastic parameters of the mixture of brittle minerals and organic matter; obtain the elastic parameters of the pore clay medium containing bound water; obtain the equivalent elastic parameters of the shale matrix and shale dry rock skeleton; based on the shale matrix and shale dry rock skeleton, etc. The effective elastic parameters of fluid-saturated shale are obtained, and the construction of anisotropic petrophysical model of shale under fluid-saturated state is completed. The invention can more accurately predict the longitudinal and transverse wave velocity and anisotropy parameters of shale.

Description

technical field [0001] The invention belongs to the field of petrophysical model modeling, and more specifically relates to a shale anisotropic rock physical model modeling method. Background technique [0002] The microstructure of shale is relatively complex, and there are various factors affecting the elastic properties of shale. Complex mineral components, organic matter, directional arrangement of clay particles, and the development of micro-cracks will all affect the elastic properties of shale. Shale has typical strong anisotropy characteristics, which are difficult problems not encountered in conventional reservoir rock physics modeling. At present, there is no effective petrophysical model modeling method to describe the elastic properties of shale. [0003] Based on the research on the microstructure and anisotropy characteristics of shale, it is shown that the clay mineral content and its directional arrangement are the main factors for its anisotropy, such as th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V99/00
CPCG01V20/00
Inventor 刘卫华
Owner CHINA PETROLEUM & CHEM CORP
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