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Method for determining pore structure through classifying isothermal adsorption curve of mud shale

A technology of isotherm adsorption curve and pore structure, applied in permeability/surface area analysis, suspension and porous material analysis, measurement device, etc., which can solve the problem that the pore structure of shale cannot be effectively judged, and the difference between different isotherm adsorption curves cannot be highlighted. and other issues to achieve the effect of diversifying types, promoting inference, and avoiding high costs

Active Publication Date: 2015-11-11
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The method disclosed by the present invention for judging the pore structure by classifying the isothermal adsorption curves of mud shale solves the technical problem that the prior art cannot highlight the difference between different isothermal adsorption curves, and even cannot effectively judge the pore structure of mud shale

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  • Method for determining pore structure through classifying isothermal adsorption curve of mud shale
  • Method for determining pore structure through classifying isothermal adsorption curve of mud shale
  • Method for determining pore structure through classifying isothermal adsorption curve of mud shale

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specific Embodiment 1

[0041] Specific embodiment 1: combine Figure 8 Isotherm adsorption curves of shale samples in the Sichuan Basin and Figure 9 Figure 8 As shown in the frequency histogram of the middle sample, the D11 sample, that is, the mud shale sample in the Sichuan Basin, is classified according to the mud shale isotherm adsorption curve classification method as the W8 type, which is a medium wedge-shaped small hole. From the pore frequency distribution diagram, it can be seen that the pores with a pore diameter of 10-20nm in the D11 sample account for the largest pore volume, and it can be preliminarily inferred that the sample is dominated by small pores; the peak of the sample pore diameter is obvious, but the percentage of the total volume of the pore where the peak is located Not high, only about 16%, the aperture frequency at the right end of the peak value decreases in turn and tends to be stable to about 6%, which can be seen in the sorting process.

specific Embodiment 2

[0042] Specific embodiment 2: combine Figure 10 Isotherm adsorption curves of shale samples in the Sichuan Basin and Figure 11 Figure 10 As shown in the frequency histogram of the middle sample, the classification result of the D10 sample, that is, the mud shale sample in the Sichuan Basin, is W9 type, which is a well-sorted wedge-shaped small hole. From the pore frequency distribution diagram, we can see that the pores with 18-24nm pore size occupy the most of the total volume of the sample. It is judged that the sample is dominated by small pores; About 27%, the frequency on the right side of the peak is stable, about 5%, it can be seen that the sorting is very good.

[0043] The method disclosed in the present invention for judging the pore structure by classifying the isothermal adsorption curves of mud shale is to classify the isothermal adsorption curves of the bedrock standard samples of mud shale through the pore shape, pore size and pore throat sorting, that is, ...

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Abstract

The invention relates to the field of shale hydrocarbon reservoir exploration, and discloses a method for determining the pore structure through classifying the isothermal adsorption curve of mud shale. The method comprises the following steps: 1, collecting the bedrock standard column sample of mud shale; 2, crushing the bedrock standard column sample obtained in step 1, carrying out isothermal adsorption test, and drafting an isothermal adsorption curve; 3, sorting the pore form, the pore size and the pore throat to obtain a mud shale isothermal adsorption curve standard map; and 4, comparing the isothermal adsorption curve of the detected sample with the mud shale isothermal adsorption curve standard map to obtain the pore structure of the detected sample. The method for determining the pore structure through classifying the isothermal adsorption curve of mud shale realizes division of all types of isothermal adsorption curves of mud shale through the isothermal adsorption curve standard map standard map, and displays the difference of different isothermal adsorption curves; and the pore structure of the mud shale sample can be determined through the isothermal adsorption curve of the mud shale sample, and can be further associated with a shale gas exploitation apparatus.

Description

technical field [0001] The invention relates to the field of exploration and development of shale oil and gas reservoirs, in particular to a method for judging the pore structure by classifying the isothermal adsorption curves of mud shale. Background technique [0002] The analysis of pore throat characteristics is one of the important contents of shale reservoir evaluation. The shale is tight in lithology, and there are a large number of micropores in the reservoir. Conventional pore research methods have limitations in describing the pore characteristics of shale. In the study of shale reservoir pore characteristics, the combination of mercury injection method and adsorption method is often used. Due to the different pore characteristics of different shale samples, the adsorption performance of mud shale is different, which affects the shape of its isotherm adsorption curve. The classification of shale isothermal adsorption curve shape can reflect the pore structure cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 闫长辉李鹏田园媛
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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