Method and device for determining the microstructure of carbonate rock

Abstract

The embodiment of the invention provides a carbonate rock microstructure determination method and device. The method includes the steps of obtaining an electronic computer X-ray CT image of a carbonate rock sample and conducting binarization processing on the CT image, wherein the pixel number of holes of the carbonate rock sample in the image obtained after binarization processing is different from the pixel number of particles of the carbonate rock sample; calculating a total area of all holes according to the pixel number of the holes, and calculating the area of the CT image of the carbonate rock sample according to the pixel number of the holes and the pixel number of the particles; determining a specific value of the total area of the holes to the area of the CT image of the carbonate rock sample to be the porosity. The scheme is based on the CT image of the carbonate rock sample, the area of the holes and the area of the CT image of the carbonate rock sample can be calculated in a quantitative mode, the porosity of the carbonate rock sample can be further calculated accurately and reliability, and quantitative and reliable analysis on a microstructure of a carbonate rock reservoir is better achieved.

Description

technical field [0001] The invention relates to the technical field of research on the microstructure of carbonate rock reservoirs, in particular to a method and device for determining the microstructure of carbonate rock. Background technique [0002] At present, there are few research methods and knowledge on the microstructure characteristics of pores, caves and fractures in carbonate rock reservoirs. Conventional casting thin sections, scanning electron microscopy and mercury intrusion are mainly used. However, these methods have some defects. , making it impossible to quantitatively and reliably analyze the microstructure of pores, caves and fractures in carbonate rock reservoirs. [0003] For example, microscopic analysis techniques in reservoir research based on casting thin sections and scanning electron microscopy techniques. The porous casting thin slice is to wash and dry the underground oil-bearing water rock, put it into the casting instrument, and pour the col...

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Problems solved by technology

[0004] 1) Calculating the porosity of the reservoir by using the casting thin section image requires professional and technical personnel to interpret it, which is highly dependent on the technical level and experience of the operator, and the difference in the thickness and flatness of the casting thin section will directly affect the quality of the identification result ; In actual work, due to differences in operators, camera parameter settings, etc., the analysis results may vary;

[0005] 2) The recognition image represents two-dimensional local pores, and the representation is poor

[0008] 1) During the mercury intrusion experiment, the mercury used is poisonous and will cause harm to the human body and the environment;

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