Method for measuring pore size distribution of rock material

A pore size distribution and rock material technology, which is applied in the analysis of suspensions and porous materials, material analysis through resonance, and material analysis, can solve the problems of time-consuming and difficult to accurately describe the pore size distribution of rock materials, etc. The effect of wide range and high measurement accuracy

Inactive Publication Date: 2020-05-15
CENT SOUTH UNIV
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Problems solved by technology

However, due to the different lithologies of various rock materials, it is difficult to accurately describe the pore size distribution inside the rock material by using the conversion c

Method used

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  • Method for measuring pore size distribution of rock material
  • Method for measuring pore size distribution of rock material
  • Method for measuring pore size distribution of rock material

Examples

Experimental program
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Effect test

Embodiment

[0041] Example Testing the pore size distribution of sandstone-like samples

[0042] (1) Prepare the sandstone sample to be tested into a standard cylindrical sample with a diameter of 5cm and a height of 2.5cm, place the sample in a vacuum saturation device for negative pressure vacuuming, the negative pressure is -0.1MPa, and the vacuum is saturated for 4h , until the sample is saturated with water.

[0043](2) NMR testing is carried out on the water-saturated sandstone sample. The parameters of the NMR tester are set as: magnet strength=0.52T, center frequency=21MHz, O1=2691500Hz, TW=1500, NECH=6000. The saturated porosity and T2 spectrum curve of sandstone-like samples obtained by nuclear magnetic resonance, the saturated porosity of sandstone samples is 6.329%, and the T2 spectrum is as attached figure 1 As shown, the maximum value of T2 is 471.375ms, and the minimum value of T2 is 0.012ms. And according to the T2 spectrum inversion of the capillary pressure-influent cu...

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Abstract

The invention discloses a method for measuring pore size distribution of a rock material. The method comprises the following steps: acquiring a capillary pressure-water inlet cumulative saturation curve by adopting a centrifugal dehydration test; then, through curve fitting with nuclear magnetic resonance T2 spectrum inversion, obtaining optimal conversion coefficient, and finally, obtaining aperture distribution. Compared with the existing method, the method disclosed by the invention has the advantages that the operation is simple and convenient, the measurable aperture range is large, the measurement precision is high, the sample is not damaged, and the repeated measurement can be realized.

Description

technical field [0001] The invention belongs to a method for measuring the pore size distribution of rock materials. Background technique [0002] Affected by a series of internal and external factors such as diagenesis, geological tectonics, and weathering, there are pore structures and defects of different scales in the interior of rock materials. In different engineering backgrounds, the existence of these pore structures brings different effects. For example, for rock slopes in cold regions, the existence of pores above the middle pores provides good storage space and water conduction channels for water storage and infiltration, and provides a basis for the deterioration of rock slopes due to freeze-thaw damage. However, for shale gas storage rock formations and petroleum oil storage rock formations, the more developed the pore structure, the stronger the gas storage and oil storage capacity of the rock formation with larger pore diameter. In a word, the distribution c...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N24/08
CPCG01N15/088G01N24/081
Inventor 邓红卫虞松涛邓畯仁田广林蒋震
Owner CENT SOUTH UNIV
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