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Quantitative characterization method of shale pores based on 3D fib-sem image

A FIB-SEM, quantitative characterization technology, applied in image enhancement, image analysis, image data processing, etc., can solve problems that cannot truly reflect the distribution of organic pores and inorganic pores in three-dimensional space, and achieve high accuracy and simple method Effect

Active Publication Date: 2018-07-20
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Although this method of simulating three-dimensional space through two-dimensional data requires less machine time, it cannot truly reflect the distribution of organic and inorganic pores in three-dimensional space, and thus is of great importance for evaluating shale oil and gas storage capacity and the pores in pores. Occurrence state, migration mechanism and ability of oil and gas bring limitations

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  • Quantitative characterization method of shale pores based on 3D fib-sem image
  • Quantitative characterization method of shale pores based on 3D fib-sem image
  • Quantitative characterization method of shale pores based on 3D fib-sem image

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Embodiment 1

[0062] In this embodiment, pore analysis is performed on shale samples, including the following steps:

[0063] 1. FIB-SEM to acquire images

[0064] FIB-SEM is a dual-beam system that integrates the imaging function of scanning electron microscope (SEM) and the cutting function of focused ion beam (FIB). High-precision 3D imaging. The imaging principle is: the sample surface is kept perpendicular to the ion beam; the FIB ion beam is used to etch the sample surface to expose the observation surface, and the SEM electron beam is used to scan the observation surface to collect secondary electrons or backscattered electrons to obtain high resolution. Imaging; then according to the requirements of the ablation thickness, set the ion beam energy parameters to ablate the observation surface, use the electron beam to image the new observation surface after ablation, and repeat this step until the imaging is completed. The end result is a sequence of images.

[0065] The images obt...

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Abstract

The invention relates to the field of oil and gas geological exploration and development, and specifically uses FIB-SEM to identify the types of three-dimensional pores inside shale and quantitatively characterize its structural information in shale oil and gas exploration. The method includes: using FIB‑SEM to perform high-precision three-dimensional imaging of inorganic matter, organic matter and pores in shale at the micron and nanoscale to obtain a three-dimensional FIB‑SEM image; and performing each two-dimensional image of the three-dimensional FIB‑SEM image. Align, correct image brightness unevenness, and filter to remove image noise; segment the preprocessed image and divide the image into pore areas, organic matter areas, and inorganic matter areas; label each pore in the image pore area, and The distribution of organic and inorganic materials around each pore divides the pores into organic pores, inorganic pores, and boundary pores. Each pore is analyzed separately through mathematical methods to obtain the characterization parameters of the three-dimensional pores.

Description

technical field [0001] The invention relates to the field of geological exploration and development of petroleum and natural gas, in particular to a method of using FIB-SEM (focused ion beam-scanning electron microscope) to identify the type of three-dimensional pores inside shale and quantitatively characterize its structural information in shale oil and gas exploration. Background technique [0002] The oil and gas storage capacity of shale is closely related to factors such as porosity and effective porosity in shale, and the quantitative description of pore type and size directly determines the occurrence state, migration mechanism and ability. At the same time, during the depositional evolution of shale, the evolution of pores has always been one of the focuses of attention, and it is the focus of our research on the evolution history of shale oil and gas deposition. Therefore, it is of great significance to study and characterize the pores of shale reservoirs. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/20G06T7/11G06T7/136
CPCG06T5/20G06T2207/30184G06T2207/10061G06T5/80G06T5/70
Inventor 牛素鋆杨继进
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI