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A quantitative characterization method and device for pore connectivity

A quantitative characterization and connectivity technology, applied in the field of oil and gas physical exploration, can solve the difficult quantitative evaluation of pore connectivity and other problems, and achieve the effect of wide applicability

Active Publication Date: 2017-10-17
PETROCHINA CO LTD
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Problems solved by technology

However, the existing experimental conditions and methods are mainly based on qualitative evaluation, and it is difficult to quantitatively evaluate the connectivity of pores.

Method used

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  • A quantitative characterization method and device for pore connectivity
  • A quantitative characterization method and device for pore connectivity
  • A quantitative characterization method and device for pore connectivity

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Experimental program
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Embodiment approach

[0089] The implementation method is as follows: First, check whether all connected domains have pore pixels falling on the boundary (surface) of the whole domain, and the connected domains without any pore pixels falling on the boundary of the whole domain are dead connected domains, otherwise they are live connected domains. Then the live connected domain is performed as Figure 9 rating shown. If there are pore pixels falling on the opposite group of boundary surfaces, it is a third-level connected domain; if there are pore pixels respectively falling on adjacent boundary surfaces, and it is not a third-level connected domain, it is a second-level connected domain; if only Pixels fall on a boundary surface, which is a level 1 connected domain. The volume percentage of active pores in the total pores can be obtained by grading connected domains: the number of pore pixels in the 1st to 3rd-level connected domains / the total number of pore pixels. Those skilled in the art can ...

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Abstract

The present invention provides a method and device for quantitative characterization of pore connectivity. The method includes: performing three-dimensional digital imaging processing on the sample to obtain a two-dimensional digital image sequence of the sample; Carry out object image distinction, generate binary digital image sequence; Generate three-dimensional digital model according to described binary digital image sequence; Determine the points of the total pixel points in the described three-dimensional digital model, the points of hole pixel points and each Position identification of pixel points; determine the pore connected domain of the sample according to the seed filling algorithm and the three-dimensional digital model; generate pores according to the total number of pixels, the number of pixels in the pores, the position identification of each pixel point and the determined pore connected domains Connectivity quantitative characterization results. This method can intuitively and quantitatively characterize the pore connectivity of rocks, and provides a powerful tool for reservoir physical property evaluation and porous media permeability evaluation.

Description

technical field [0001] The invention relates to the field of oil and gas physical exploration, in particular to a digital characterization method and device for rock pore structure. Background technique [0002] Unconventional oil and gas systems are more complex than conventional oil and gas systems, and one of their important features is that unconventional oil and gas reservoirs (shale, tight sandstone, etc.) have small pore scales, low porosity, and very low permeability. The reservoir characteristics, occurrence mechanism and production process of oil and gas resources depend to some extent on the microscopic pore structure of oil and gas reservoirs. At present, the methods for characterizing the nanoscale three-dimensional pore structure of unconventional reservoirs are mainly nano-CT technology and focused ion / electron dual-beam scanning electron microscopy (FIB-SEM). Among them, the laboratory detection resolution limit of nano-CT technology is about 50nm; the resol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 孙亮王晓琦吴松涛李建明金旭朱德升
Owner PETROCHINA CO LTD
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