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A Classification Method of Carbonate Rock Pore Structure Based on Overburden Seepage Experiment

A technology of pore structure and carbonate rock, applied in the direction of permeability/surface area analysis, suspension and porous material analysis, analysis of materials, etc., can solve the problems that do not reflect the dynamic change characteristics of pore structure

Active Publication Date: 2022-02-15
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0002] There are many methods for characterization and classification of rock pore structure, such as mercury injection, casting thin section, nuclear magnetic resonance and other methods can be used to study and classify rock pore structure, but the classification of rock pore structure by these methods is only the result of static analysis and evaluation , does not reflect the pore structure and its dynamic change characteristics under actual formation conditions, especially in carbonate reservoirs, where fractures are developed and the pressure is generally high. constantly changing, it is necessary to use dynamic evaluation methods to classify its pore structure types

Method used

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  • A Classification Method of Carbonate Rock Pore Structure Based on Overburden Seepage Experiment
  • A Classification Method of Carbonate Rock Pore Structure Based on Overburden Seepage Experiment
  • A Classification Method of Carbonate Rock Pore Structure Based on Overburden Seepage Experiment

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Embodiment 1

[0051] Such as image 3 As shown, for the carbonate rock cores in a certain area of ​​the Qaidam Basin, a series of permeability-confining pressure curves were obtained by testing the oil phase permeability under different confining pressure conditions, and the permeability-confining pressure curves were plotted. The curve is divided into two parts, the high-pressure section and the low-pressure section, and then the data of the high-pressure section and the low-pressure section are respectively fitted. Combined parameter change rate △a and △b.

[0052] Table 1

[0053]

[0054] Table 2

[0055]

[0056] As shown in Table 1, the △a and △b of the cores with different pore structure types are quite different. According to the different ranges of △a and △b, the pore structure types of the cores can be divided.

[0057] Through core observation, it is found that, in terms of broad categories, there are two types of pore structures in the taken carbonate cores: fractures a...

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Abstract

The present invention relates to the field of pore structure classification of reservoir rocks in the process of oil and gas field development, in particular to a method for pore structure classification of carbonate rocks based on overburden pressure seepage experiments. The method includes the following steps: preparing rock samples, The gas permeability is measured; after the above-mentioned rock samples are saturated with simulated oil, the permeability-confining pressure relationship measurement experiment is carried out to obtain the permeability-confined pressure curve; the permeability-confined pressure curve is segmentally fitted to obtain the permeability- Confining pressure fitting curve, analyze the parameter change rate of segmental fitting; observe the core, and make a preliminary judgment on the pore structure type according to the core observation results; Combined with the theoretical analysis of the core observation results and the characteristics of the permeability-confining pressure fitting curve, the pore structure types of the core are classified, and the pore structure classification results of the classification method of the present invention are closer to the real situation of carbonate reservoirs.

Description

technical field [0001] The invention relates to the field of pore structure classification of reservoir rocks during the development of oil and gas fields, in particular to a method for classifying the pore structure of carbonate rocks based on overburden seepage experiments. Background technique [0002] There are many methods for characterization and classification of rock pore structure, such as mercury injection, casting thin section, nuclear magnetic resonance and other methods can be used to study and classify rock pore structure, but the classification of rock pore structure by these methods is only the result of static analysis and evaluation , does not reflect the pore structure and its dynamic change characteristics under actual formation conditions, especially in carbonate reservoirs, where fractures are developed and the pressure is generally high. The dynamic evaluation method is needed to classify the pore structure types. Contents of the invention [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24G01N15/08
CPCG01N33/24G01N15/0826G01N15/088
Inventor 罗向荣任晓娟田进赵帅
Owner XI'AN PETROLEUM UNIVERSITY
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