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A Quantitative Evaluation Method of Shale Organic Matter Pore Structure

A pore structure and quantitative evaluation technology, applied in the field of natural gas exploration, to achieve the effect of simple experimental principle, accurate and reliable experimental results, and wide application range

Active Publication Date: 2022-05-03
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0004] The present invention provides a quantitative evaluation method of shale organic matter pore structure, which is used to overcome the limitation of evaluating shale gas storage capacity in the prior art by only characterizing the pore structure of shale reservoir through the angle of pore size

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  • A Quantitative Evaluation Method of Shale Organic Matter Pore Structure
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  • A Quantitative Evaluation Method of Shale Organic Matter Pore Structure

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Embodiment Construction

[0029] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1-5 As shown, the embodiments of the present invention provide a method for quantitative evaluation of shale organic matter pore structure, the method comprising the following steps:

[0031] S 1 : Obtain shale samples and perform pretreatment on shale samples;

[0032] S 2 : Using a fully automatic specific surface and pore size distribution analyzer to test the carbon dioxide and nitrogen adsorption curves of the shale samples;

[0033] S 3 : Place the sample after testing the carbon dioxide and nitrogen adsorption curves in a muffle furnace until the organic matter is completely burned;

[0034] S 4 : Use the automatic specific surface and pore size distribution analyzer to conduct carbon dioxide and nitrogen a...

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Abstract

The invention provides a quantitative evaluation method of shale organic matter pore structure, which comprises pulverizing shale samples and testing the carbon dioxide and nitrogen adsorption curves of shale samples by using a fully automatic specific surface and pore size distribution analyzer; The samples were placed in the muffle furnace and burned until the organic matter was completely burned; the burned samples were then subjected to carbon dioxide and nitrogen adsorption tests; the DFT model and the BJH model were used to interpret the carbon dioxide and nitrogen adsorption data of the shale samples before and after combustion , to obtain the pore structure parameters of the shale samples before and after combustion; the pore structure parameters of the shale organic matter can be obtained by subtracting the pore structure parameters after combustion from the pore structure parameters of the shale samples before combustion. The invention overcomes the defect that the field emission scanning electron microscope technology cannot accurately characterize the relative contribution of the organic pores below 10nm, and the experiment is simple and the result is accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of natural gas exploration, in particular to a quantitative evaluation method for shale organic matter pore structure. Background technique [0002] With the large-scale exploration and development of unconventional oil and gas, shale oil and gas, as a kind of unconventional oil and gas, has become the focus of attention, and the research on shale oil and gas is also deepening. The pore structure characteristics of shale reservoirs determine the gas adsorption capacity of shale, which is the focus of shale gas research. [0003] At present, the commonly used methods for quantitative evaluation of shale organic pores include field emission scanning electron microscopy and nuclear magnetic resonance. The quantitative evaluation of organic pores by field emission scanning electron microscopy is to use the surface porosity of organic pores observed under the microscope to calculate the organic matter porosity o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N7/04
CPCG01N15/088G01N7/04
Inventor 肖智慧郭小文王科清
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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