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A method for obtaining the electrical properties of tight sandstone rocks using digital cores

A technology of electrical characteristics and digital core, applied in the field of petrophysics, can solve the problems of difficulty in characterizing three-dimensional spatial structure, time-consuming physical properties of cores, and difficulty in obtaining high-quality rock-electrical parameters.

Active Publication Date: 2021-08-10
SOUTHWEST PETROLEUM UNIV
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  • Application Information

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Problems solved by technology

However, due to the low porosity and low permeability of tight sandstone, it is difficult to use traditional two-phase displacement experiments to establish saturation, making it difficult to obtain high-quality lithoelectric parameters
Traditional rock physics methods are time-consuming to analyze the physical properties of rock cores, and it is difficult to characterize the structure of pores in three-dimensional space
Therefore, it is difficult to obtain the pore structure of tight sandstone and its influence on rock electrical properties through traditional experimental means.

Method used

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  • A method for obtaining the electrical properties of tight sandstone rocks using digital cores
  • A method for obtaining the electrical properties of tight sandstone rocks using digital cores
  • A method for obtaining the electrical properties of tight sandstone rocks using digital cores

Examples

Experimental program
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Effect test

Embodiment

[0055] 1. Select a rock core and perform micro-CT scanning to obtain a series of two-dimensional pictures, such as Figure 14 As shown (the picture is only one of them):

[0056] 2. Use the median filter for denoising processing, select the appropriate gray threshold to select the pores, the selection results are as follows Figure 15 Shown:

[0057] 3. Using the Shan-Chen multi-component D3Q19 model of the lattice Boltzmann method for calculation, the gas-water distribution results of the digital core at different water saturations are obtained.

[0058] 4. Using the finite element method, treat each pixel in the image as a unit, and set the conductivity of the pixel occupied by water as a result obtained in the previous step to 1, and set the conductivity of the pixel occupied by gas to 0. The voltage difference is applied to the entrance and exit of the model, and the other four surfaces are insulated, and finally the current at the exit is obtained, and the resistance of...

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Abstract

The invention discloses a method for obtaining electrical properties of tight sandstone rocks by using digital rock cores, and relates to the field of rock physics. Taking tight sandstone gas layer rocks as the research object, digital cores are established through slice images scanned by micro-CT, and the pore structure parameters of the cores are extracted. The lattice Boltzmann method is used to simulate the distribution of gas and water phases in rocks at different saturations, and based on this, the influence of microscopic pore structure and wettability of tight sandstone on its resistivity characteristics is studied. The invention utilizes the digital rock core technology to just make up for the deficiency of the traditional experiment.

Description

technical field [0001] The invention relates to the field of rock physics, in particular to a method for obtaining electrical properties of tight sandstone rocks by using digital cores. Background technique [0002] my country is rich in tight sandstone gas resources and has great potential. Tight sandstone gas reservoirs have been discovered in the Sichuan Basin as early as the early 1970s. By the end of 2011, the cumulative proven recoverable reserves of tight sandstone gas in my country were 1.76×10 12 m 3 , accounting for about 2 / 5 of the country's total proven natural gas reserves, and tight sandstone gas production accounted for about 1 / 4 of the country's natural gas production in 2011 (Lu Xuesong et al., 2014). According to the forecast of the Ministry of Land and Resources, my country's tight sandstone gas production will reach (400-600)×10 in 2030 8 m 3 , while unconventional natural gas production will account for about half of the total natural gas production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/08G01N27/04
CPCG01N27/041G01R27/08
Inventor 刘向君熊健梁利喜刘凯
Owner SOUTHWEST PETROLEUM UNIV
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