Fractal characterization method of organic shale micro-pores based on CO2 adsorption

An organic matter and adsorbate technology, which is applied in the analysis of suspension and porous materials, permeability/surface area analysis, special data processing applications, etc. dimensionality and other issues, to achieve the effect of wide application value

Inactive Publication Date: 2018-01-09
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

In related technologies, the measurement of shale pore parameters usually adopts N 2 Adsorption experiments were carried out, but N 2 The molecular activity is low at 77K, and the experiment usually cannot accurately obtain the information of micropores (especially below 1nm). Therefore, the use of N 2 It is difficult to obtain the fractal dimension of micropores by the model of calculating fractal dimension in adsorption experiment

Method used

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  • Fractal characterization method of organic shale micro-pores based on CO2 adsorption
  • Fractal characterization method of organic shale micro-pores based on CO2 adsorption
  • Fractal characterization method of organic shale micro-pores based on CO2 adsorption

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Embodiment 1

[0021] Please refer to figure 1 , the embodiment of the present invention provides a CO based 2 A fractal characterization method for adsorbed organic matter shale micropores, comprising the following steps:

[0022] (1) (1) Collect organic shale samples, and vacuumize the organic shale samples after treatment; the treated organic shale samples are particles with a particle size of 10-20 mesh.

[0023] (2) CO 2 As an adsorbate, the organic shale sample is adsorbed under vacuum conditions, and the adsorption data is collected; CO 2 The purity is greater than 99.9999%;

[0024] (3) Calculate the characteristic adsorption energy of the adsorbate, and substitute the characteristic adsorption energy, the equilibrium pressure in the adsorption data, and the saturated vapor pressure into the maximum adsorption capacity formula to obtain the maximum adsorption capacity;

[0025] Specifically, the DR equation is linearly fitted and combined with the adsorption potential to obtain t...

Embodiment 2

[0064] Using the fractal characterization method of Example 1 of the present invention, the downhole shale samples of Longmaxi Formation shale (JYX-1) and Niutitang Formation shale (CYX-1) in the marine organic shale reservoirs in southern my country were microscopically analyzed. Hole calculates the fractal dimension.

[0065] (1) Collection of CO 2 Adsorption data were substituted into the relevant data in formula (3) to obtain the fitting equations and maximum adsorption capacity of the two groups of samples respectively, referring to figure 2 , image 3 ,Table 1;

[0066] Table 1 Fitting equation and maximum adsorption capacity of two groups of shale microporous samples

[0067]

[0068] (2) Calculate the relative adsorption amount according to the maximum adsorption amount obtained, and use the relative adsorption amount and adsorption potential to calculate the scale parameter ρ and shape parameter υ through the characteristic expression (7), see Table 2;

[0069]...

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Abstract

The invention discloses a fractal characterization method of organic shale micro-pores based on CO2 adsorption, and belongs to the technical field of unconventional oil gas exploration and development. According to the method, the fractal theory of microporous medium in material chemistry is utilized to calculate the fractal dimension of organic shale micropores, the fractal feature is analyzed and calculated by utilizing adsorption data of CO2 in shale micro-pores through a multi-step linear and nonlinear fitting process, and a fractal dimensional value is finally obtained. The method can provide a reliable basic analysis parameter for evaluating the difference of porous structures of different storage layers, and can be used for calculating organic shale microporous fractal dimensions with different types in different regions, providing reference data to the complex degree of microporous structures and further guiding heterogeneous feature expression of the storage layers.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas exploration and development, and specifically relates to a CO-based 2 A Fractal Characterization Method for Adsorbed Organic Matter Shale Micropores. Background technique [0002] The research object of fractal theory is the irregular and self-similar geometric forms that widely exist in nature and real life, and these forms cannot be described by traditional Euclidean geometry. The fractal theory is used to describe the surface roughness of media with complex pore structures, and the complexity and heterogeneity of porous materials are represented by the size of the fractal dimension D. The value of D is between 2 and 3, where 2 indicates that the surface is flat and smooth. In a plane, 3 indicates free space without solid features; therefore, the closer the D value is to 3, the more complex the pore structure in the porous media and the rougher the surface; the closer to 2, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G06F17/50
Inventor 戴方尧胡海燕
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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