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Quantitative characterization method of shale reservoir pore system and method for evaluating pore characteristics of shale reservoir

A shale reservoir, quantitative characterization technology, applied in the direction of measuring device, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problems of difference in results, lack of quantitative statistical standards, etc.

Inactive Publication Date: 2018-12-14
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Application Information

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Problems solved by technology

However, there are mainly the following problems in the use of electron microscope observation: the same sample, different scales and different viewing areas observe different micropore characteristics and sizes, and the results are different; there is a lack of appropriate quantitative statistical standards

Method used

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  • Quantitative characterization method of shale reservoir pore system and method for evaluating pore characteristics of shale reservoir
  • Quantitative characterization method of shale reservoir pore system and method for evaluating pore characteristics of shale reservoir
  • Quantitative characterization method of shale reservoir pore system and method for evaluating pore characteristics of shale reservoir

Examples

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Embodiment 1

[0040] A quantitative characterization method of shale reservoir pore system, comprising:

[0041] (1) Determine the minimum magnification at which the electron microscope can observe organic pores.

[0042] For the same sample, the electron microscope was used to observe the micro-nano pore characteristics of shale under different magnification conditions, and the pore diameter parameters were quantitatively counted, and the relationship between different magnifications and statistical micropore pore sizes was established. Such as figure 2 shown.

[0043] from figure 2 It can be shown in the results that: when the magnification is less than 30,000 times, the image statistics results are obtained after stitching 64 electron microscopic images, and the micropore parameters vary with the observed micropores. At low magnification, relatively large pores are mainly seen, and the statistical pore diameter is also large; as the magnification increases, the observed micropore di...

Embodiment 2

[0055] This example provides a quantitative characterization method for the pore system of shale reservoirs. The difference between this example and Example 1 is that the number of observation fields of the electron microscope image is different when the pore parameters are determined to be stable. This example Please refer to Example 1 for unmentioned parts.

[0056] A quantitative characterization method of shale reservoir pore system, comprising:

[0057] (1) Determine the minimum magnification at which the electron microscope can observe organic pores. Determine the minimum magnification to be greater than or equal to 30,000 times.

[0058] (2) Determine the minimum observation field number of the electron microscope image when the pore parameters tend to be stable. The determined minimum number of observation fields is 56.

[0059] (3) Use the software to quantitatively count and observe the pore parameters of the number of viewsheds.

[0060] The known software such ...

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Abstract

The invention discloses a quantitative characterization method of a shale reservoir pore system and a method for evaluating the pore characteristics of a shale reservoir, and relates to the technicalfield of pore characterization. The quantitative characterization method of the shale reservoir pore system comprises the following steps: determining the minimum magnification of organic pores can beobserved by an electron microscope; determining the number of observation vision fields of an electron microscope image when pore parameters tend to be stable; utilizing a software to perform quantitative statistics for the pore parameters of the number of observation vision fields; and establishing a mathematical distribution map of the pore parameters. The method can quantitatively characterizethe micro-nano-pore structure characteristics of the shale reservoir accurately. According to the method for evaluating the pore characteristics of the shale reservoir, the mathematical distributionmap obtained by the quantitative characterization method of the shale reservoir pore system is utilized to evaluate the pore characteristics. The evaluation results are relatively accurate.

Description

technical field [0001] The invention relates to the technical field of pore characterization, and in particular to a quantitative characterization method of a shale reservoir pore system and a method for evaluating shale reservoir pore characteristics. Background technique [0002] The micropores of organic-rich shale belong to the micro-nano pore system, and the pore scale span of oil and gas storage is large. Nano-scale pores account for about 80% of the total pores, and micro-scale pores account for about 20% of the total pores. The statistical results are as follows: figure 1 shown. It cannot be observed by conventional thin-section techniques and is usually observed by electron microscopy. However, there are mainly the following problems in the use of electron microscope observation: the same sample, different scales and different viewing areas observe different micropore characteristics and sizes, and the results are different; there is a lack of appropriate quantitat...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/088G01N2015/0846
Inventor 邓虎成周文陈文玲周秋媚徐浩
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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