Method and system for quantitatively distinguishing pores and throats

By combining CT scanning and image processing with high-pressure injection of bromoalkanes or iodide solutions, the problem of inaccurate quantification of pores and channels in existing technologies has been solved. This method enables accurate quantitative differentiation of pores and channels and sample reuse, and is applicable to various types of samples.

CN120820570APending Publication Date: 2025-10-21PETROCHINA CO LTD
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Patent Information

Application Number
CN202410437640.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-04-12
Publication Date
2025-10-21

AI Technical Summary

Technical Problem

Existing technologies cannot accurately and quantitatively distinguish between pores and channels, affecting the accuracy and cost-effectiveness of reservoir evaluation.

Method used

By combining CT scanning and image processing with high-pressure filling of brominated alkanes or iodide solutions, the Jamin effect is used to distinguish pores and channels. Rock samples are filled with brominated alkanes or sodium iodide solutions, and after settling, CT scanning is used to obtain volume information. The volume and radius of pores and channels are calculated using image processing software.

Benefits of technology

It achieves accurate quantitative differentiation of pores and channels, reduces the cost of rock physics research, allows for sample reuse, is applicable to various types of samples, and has a simple and easy-to-promote calculation method.

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Abstract

The invention discloses a method and system for quantitatively distinguishing pores and throats, and relates to the technical field of petroleum and natural gas exploration, and the method comprises the following steps: S1, carrying out CT scanning and image processing software processing on a sample subjected to oil washing and drying treatment to obtain volume information of all pores and throats in the sample; s2, measuring the wettability of the sample, and if the sample is a water-wetted sample, filling saturated alkyl bromide into the sample by using high-pressure filling equipment; if the sample is an oil wetting sample, filling the sample with an iodine-containing inorganic salt solution by using high-pressure filling equipment; s3, wiping the filled sample, standing, and carrying out CT scanning to obtain volume information of the brominated alkane or iodine-containing inorganic salt solution, so as to obtain pore volume and throat volume information; and S4, processing the information of the pore volume and the throat volume by using image processing software to obtain the pore volume, the radius, the throat volume and the radius. The method has no requirement on sample size and is suitable for various samples; meanwhile, the calculation method is simple and easy to popularize and use in a large range.
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Citation Information

Patent Citations

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  • Shale reservoir microscopic wettability determination method and device

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  • Method and device for evaluating seepage capability of rock

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  • Method for quantitatively characterizing dynamic change of Jamin effect

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  • Experiment system and experiment method based on micro-fluid control and Jamin effect observation

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