Core self-absorption experimental method based on CT scanning

Abstract

The invention discloses a core self-absorption experimental method based on CT scanning, which includes the following steps: S100, acquiring a core sample, and acquiring an image of a core sample in astate of no invasion of self-absorption water through the CT scanning; S200, capturing images at various time points in a state of invasion of self-absorption water through CT scanning constant-angelprojection, in a core sample water self-absorption experiment process; S300, acquiring the CT scanning projection image of the core sample after the water self-absorption experiment process is stopped; S400, acquiring three-dimensional spatial distribution of self-absorption water in the pores of rock before and after invasion of self-absorption water through an image difference method. The method can perform measurement through CT scanning, without taking the core from self-absorption water, to avoid measurement errors. At the same time, the infiltration absorption rate of self-absorption water in the pores of the core, and the specific distribution position of self-absorption water in the core can be obtained, measurement results can be more accurate and comprehensive.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a CT scanning-based rock core self-priming experiment method. Background technique [0002] The core is a cylindrical rock sample taken out of a hole by using an annular core drill bit and other coring tools according to the needs of geological exploration work or engineering, ore-bearing rock or ore taken out of a solid mineral ore body or ore bed, then It is called the core, and the core is an important physical geological data for studying and understanding the underground geology and mineral conditions. [0003] Spontaneous imbibition is defined as the displacement of wet relative to non-wet phase in porous media due to capillary forces. The essence of rock capillary self-absorption is the energy imbalance of the rock-fluid system. The rock-fluid system always shows a tendency to decrease toward the free energy of the system. When the free energy of the rock-oil-gas int...

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Problems solved by technology

[0007] (1) Existing core self-absorption test method When performing a self-absorption test on a core, it is necessary to take the core out of the self-absorption water, a layer of water will adhere to the surface of the core, and when the water is wiped off, the core will be taken away Part of the absorbed moisture will make the measurement results deviate;

[0008] (2) when the existing rock core self-absorption test method carries out the self-absorption experiment to the rock core, although the relationship between the self-absorption water quality and time can be obtained, the imbibition rate of the self-absorption water in the core pores cannot be obtained;

[0009] (3) The existing core self-absorption test method cannot determine the specific distribution of self-absorption water in the core when the self-absorption test is performed on the core, making the measurement results incomplete

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