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Physical elastic template of fracture-porosity type rock

A petrophysics and elastic modulus technology, applied in the field of exploration rock geophysics, can solve problems such as poor application effect and great influence on calculation accuracy.

Active Publication Date: 2019-09-24
HOHAI UNIV
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Problems solved by technology

Xu and White (1995) based on the experimental analysis results of water-bearing sandstones by Han et al. (1986), comprehensively used other models, Wyllie equation and Gassmann equation, and proposed a mixed model of sand and mudstone, which is widely used in reservoir shear wave velocity calculation and rock physical analysis. However, the calculation accuracy of this model is greatly affected by the input parameters, so the actual application effect in the industry is not very good

Method used

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  • Physical elastic template of fracture-porosity type rock
  • Physical elastic template of fracture-porosity type rock
  • Physical elastic template of fracture-porosity type rock

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Embodiment Construction

[0055] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0056] A fracture-porosity rock physical elastic template, the establishment steps are as follows:

[0057] (1) Obtain the composition and content of quartz and feldspar in the rock matrix according to geological data, and obtain the elastic parameters and density of the rock matrix;

[0058] (2) Introduce the governing equations of wave propagation in a two-hole medium:

[0059] The local fluid flow interaction between different pore regions is introduced into strain energy and kinetic energy, and the corresponding potential energy function, kinetic energy function and dissipation function are established, and then the governing equation of wave propagation in dual-porous media is deduced as:

[0060]

[0061]

[0062]

[0063] ...

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Abstract

The invention belonging to the field of rock exploration geophysics discloses a physical elastic template of a fracture-porosity type rock. In order to study the compact sandstone reservoir with high saturated gas, micro-fracture development and high heterogeneity, the model uses a Voigt-Reuss-Hill model to calculate the elastic modulus of mixed minerals; a differential equivalent medium (DEM) model is used for describing a skeleton elastic modulus of a facture and porosity rock; and on the basis of a Biot-Rayleigh theory, local fluid characteristics of the pore are described and a relationship between the elastic parameters and physical properties of the compact sandstone reservoir is disclosed.

Description

technical field [0001] The invention belongs to the field of exploration rock geophysics, and in particular relates to a fissure-pore type rock physical elastic template, which is used to study tight sandstone reservoirs with high gas saturation, developed micro-cracks and strong heterogeneity by establishing a rock physical elastic template. Background technique [0002] Tight sandstone generally has the geological characteristics of low porosity, low permeability and micro-fracture development, and presents strong heterogeneity. Compared with conventional sandstone reservoirs, tight sandstone reservoirs have obvious differences in petrophysical properties and seepage mechanical properties. Smith et al. (2010) pointed out that the fractures in tight sandstone are the main factors affecting the velocity of seismic waves, and the existence of micro-cracks will affect the oil and gas output of tight sandstone reservoirs, and the heterogeneity inside the rock will lead to the i...

Claims

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Application Information

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IPC IPC(8): G01V1/30G01V1/50
CPCG01V1/30G01V1/306G01V1/50
Inventor 巴晶何润发李帆
Owner HOHAI UNIV
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