Method for analyzing pore characterization of tight sandstone reservoir based on Matlab

A technology for tight sandstone reservoirs and pores, which is applied in the fields of material analysis, permeability/surface area analysis, suspension and porous material analysis, etc. It can solve the problem of insufficient quantitative research on pore characterization and the inability to observe the pore throat characteristics of the reservoir space distribution, etc. question

Inactive Publication Date: 2018-12-07
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

Fluid injection experiments represented by mercury porosimetry can indirectly obtain parameters such as reservoir space distribution and pore size through mercury intrusion curves, but cannot directly observe reservoirs like image observation methods such as SEM and nano-CT technology. Spatial distrib...

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  • Method for analyzing pore characterization of tight sandstone reservoir based on Matlab
  • Method for analyzing pore characterization of tight sandstone reservoir based on Matlab
  • Method for analyzing pore characterization of tight sandstone reservoir based on Matlab

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[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0049] Such as Figure 4 As shown, the present invention provides a kind of method based on Matlab analysis tight sandstone reservoir pore characterization, comprises the steps:

[0050] Step 1, read the thin-section image and SEM image of the tight sandstone reservoir;

[0051] Casting thin section images and SEM images are used here as a means to analyze the characterization of reservoir pores. Among them, the casting thin section is made by injecting color...

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Abstract

The invention discloses a method for analyzing pore characterization of a tight sandstone reservoir based on Matlab, and the method is as follows: firstly reading a cast thin slice image and an SEM image of the tight sandstone reservoir; then adjusting an image threshold, and performing binarization processing on the cast thin slice image and the SEM image to obtain a binary image; calculating porosity by identifying black pixel points of the binary image; and obtaining pore radius distribution of the tight sandstone reservoir; finally, the obtaining the pore average diameter and the varianceof the tight sandstone reservoir, and the outputting the obtained binary image and obtained data. Researches on the pore characterization of the tight sandstone reservoir by use of the software Matlabare mainly divided into two methods. One method uses a built-in function to quantitatively analyze the binary image, and is suitable for nano-scale pores and micro-scale pores. The other method useslinecut or a slice method to directly analyze the cast thin piece and SEM image and the like, and is suitable for nano-scale pores.

Description

technical field [0001] The invention relates to the technical field of pore characterization analysis of tight sandstone reservoirs, in particular to a method for analyzing the pore characterization of tight sandstone reservoirs based on Matlab. Background technique [0002] Reservoir microscopic pore structure refers to the geometric shape, size, distribution and interconnection of pores and channels in reservoir rocks, which directly affects the development of reservoir pore space. Reservoir storage space is divided into three levels: millimeter pores, micropores, and nanopores. Cai Cai and others discovered nanopores for the first time in the study of unconventional reservoirs in China by applying field emission scanning electron microscopy and nano-CT reconstruction technology. Famous scholars have studied the pore structure and characterization of tight sandstone reservoirs, and various methods have been applied to study the pores of tight sandstones, mainly in three ca...

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08G01N15/088
Inventor 久博黄文辉何明倩刘凯贾瑜
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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