Automatic identifying and quantitative analyzing method for organic and inorganic holes in shale electron microscope images

An automatic identification, organic pore technology, applied in the field of oil and gas geological exploration, can solve the problems of lack of general applicability, inability to scan image identification and analysis, and the conclusion is not representative of the whole, to achieve the effect of simple method and high accuracy

Inactive Publication Date: 2017-05-10
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Although this method achieves the distinction and analysis of organic pores and inorganic pores, it cannot effectively identify and analyze any scanned image with both inorganic pores and organic pores. The region directly affects the overall conclusion, and the conclusion is not representative of the whole

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  • Automatic identifying and quantitative analyzing method for organic and inorganic holes in shale electron microscope images
  • Automatic identifying and quantitative analyzing method for organic and inorganic holes in shale electron microscope images
  • Automatic identifying and quantitative analyzing method for organic and inorganic holes in shale electron microscope images

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Embodiment 1

[0040] In this embodiment, pore analysis is performed on shale samples, including the following steps:

[0041] 1. SEM image acquisition

[0042] The scanning electron micrograph of shale is shown in Fig. 2a. The image size acquired by SEM is: 4364*3520 (pixels), each pixel represents 5 nm. That is, the size of the scanning area is 21.82 um in length and 17.60 um in width. In order to better show the details of the image, Fig. 2b is an enlarged view of the SEM image of shale. Scanning does not require the model of the instrument itself. The size of the image acquired by the SEM is not limited, and the pixels in the x-direction and y-direction can be of any value. Likewise, each pixel size is unlimited. The scanning signal can come from secondary electrons or backscattered electrons.

[0043] 2. Image preprocessing

[0044] It mainly includes image filtering processing. We use non-local mean filtering, where the image sub-block is 3*3, and smooth the image. Figure 3 a i...

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Abstract

The invention mainly belongs to the technical field of petroleum geological exploration and specifically relates to an automatic identifying and quantitative analyzing method for organic and inorganic holes in a shale electron microscope image. According to the invention, a scanning electron microscope is utilized for scanning a shale sample and the shale electron microscope image containing organic matter, inorganic matter and holes is obtained. The shale electron microscope image is divided into a organic matter zone, an inorganic matter zone and a hole zone according to gray level. The number of the holes is obtained through communication analysis of the holes in the hole zone and the holes are marked. Then the holes are judged and divided into organic holes and inorganic holes. A problem that the effective classification and quantitative analysis of the holes cannot he realized in the prior art is solved and a foundation is provided for follow-up evaluation of shale oil and gas storage capability, existing states of oil and gas in the holes and migration mechanism and capability.

Description

technical field [0001] The invention mainly belongs to the technical field of petroleum and natural gas geological exploration, and specifically relates to a method for automatic recognition and quantitative analysis of organic and inorganic pores in shale electron microscope images. Background technique [0002] Oil and gas in shale mainly occur in pores and fractures in shale, and parameters such as porosity, pore type, pore structure, pore size distribution, and connectivity are crucial to the exploration and development of shale oil and gas. These parameters are directly related to the oil and gas storage capacity of shale, the occurrence state of oil and gas, the migration mechanism and ability, and the depositional evolution process of shale, and ultimately affect the difficulty of oil and gas production and the value of exploration and development. Therefore, it is of great significance to study and characterize the pores of shale reservoirs. Only by accurately under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/11G06T7/187G06T5/00G06T5/20
CPCG06T7/0002G06T5/002G06T5/20G06T2207/10061G06T2207/30184G06T2207/30242
Inventor 牛素鋆杨继进
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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