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Method and system for representing organic micropores and mesopores of shale based on FIB-HIM

A shale and characterization technology, which is applied to the use of wave/particle radiation for material analysis, measuring devices, instruments, etc., can solve problems such as the inability to directly observe the spatial distribution of pores

Active Publication Date: 2019-01-01
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The test process of this type of method is relatively simple, but it is an indirect method, which simplifies many physical phenomena and cannot directly observe the spatial distribution of pores

Method used

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  • Method and system for representing organic micropores and mesopores of shale based on FIB-HIM
  • Method and system for representing organic micropores and mesopores of shale based on FIB-HIM
  • Method and system for representing organic micropores and mesopores of shale based on FIB-HIM

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Embodiment

[0112] 1. Image acquisition module:

[0113] In the example of the present invention, the image resolution of the helium ion beam is 1nm, and the scanning area is 0.779um*0.777um; the cutting thickness of the focused ion beam is 3nm, and 408 layers are cut, and a total of 408 two-dimensional images are obtained, so the analyzed sample The thickness is 1.224um, the acquired image is as follows figure 2 shown. From figure 2 It can be seen from the figure that FIB-HIM can be used to perform ultra-high resolution three-dimensional imaging of organic pores, organic matter, and clay minerals in shale samples. At the same time, it can be seen that the image after imaging has major problems such as inconsistency of upper and lower gray scales and bright lines.

[0114] 2. Image processing module:

[0115] Inconsistency of the upper and lower gray levels of the image: the present invention obtains two peaks respectively [ML 1 ,ML 2 ,ML 3 ,...,ML k ,...,ML 408 ] and [NL 1 ,N...

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Abstract

The invention discloses a method and a system for representing organic micropores and mesopores of shale based on FIB-HIM, which relates to the field of three-dimensional structure imaging of shale. The method comprises the following steps: performing the three-dimensional imaging for a shale sample; processing the image; and performing the discrete representation for the pores of the shale sample. By adopting the method and the system for representing the organic micropores and mesopores of the shale based on the FIB-HIM, the defects in the prior art that the organic micropores and mesoporesof the shale cannot be accurately represented, and the evaluation for the oil and gas storage capacity of the shale, and the reserve state of oil and gas in the pores, the transport mechanism and capacity is limited can be overcome.

Description

technical field [0001] The invention relates to the field of three-dimensional structure imaging of shale, in particular to a method for characterizing organic micropores and mesopores of shale based on a focused ion beam-helium ion microscope (FIB-HIM). Background technique [0002] Shale gas reservoirs develop a large number of micro-nano pores, and the structural characteristics of organic pores directly determine the occurrence, migration mechanism and ability of oil and gas in the pores. Therefore, it is of great significance to study and effectively characterize the organic pores of reservoirs. Among them, the organic pores in the pores are the main body of shale nanopores, and their number and pore size directly affect the shale gas reserves, and the connectivity plays a crucial role in the migration and exploitation of shale gas. Therefore, the characterization of the pore structure of organic pores has always been one of the hot issues in the research of shale gas ...

Claims

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Application Information

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IPC IPC(8): G01N23/2255G01N23/2202
CPCG01N23/2202G01N23/2255G01N2223/081G01N2223/104G01N2223/401
Inventor 牛素鋆杨继进吴建国
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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