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Core fracture identification method based on three-dimensional image information processing

A technology of three-dimensional images and identification methods, which is applied in the field of image processing and core fracture identification, and can solve the problems of combining CT sequence diagrams for analysis, deviation of core fracture identification results, etc.

Active Publication Date: 2015-04-08
SICHUAN UNIV
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Problems solved by technology

However, some of the above-mentioned methods analyze the core surface images, and some analyze each core CT sequence image in isolation to identify its fractures. They only use the two-dimensional image information of the core, but do not combine all the CT sequence images together for analysis, ignoring the The connection information of core fractures between different two or more core CT sequence images, so it is easy to form narrow lines in two-dimensional images, and only isolated and disconnected pores or random pores in three-dimensional data fields. The noise is misjudged as a fracture, or the target that is nearly circular in the 2D image but should be a part of the fracture in the 3D data field is misjudged as not a fracture, which often leads to deviations in the identification results of core fractures

Method used

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  • Core fracture identification method based on three-dimensional image information processing
  • Core fracture identification method based on three-dimensional image information processing
  • Core fracture identification method based on three-dimensional image information processing

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Experimental program
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Effect test

Embodiment 1

[0067] Step 1: Use a CT machine to scan the rock core to be processed to obtain 400 core CT sequence images and store them in the computer, such as figure 1 In the picture (a) in the middle, observe the picture and find that there is a narrow and long line-shaped target at the right of the center of the picture;

[0068] Step 2: Use the image reading function of the 3D core image fracture recognition software to read in the CT sequence image of the core scanned in step 1. The software reconstructs the 3D image of the CT sequence image according to the Marching Cubes algorithm, and obtains the The three-dimensional data field formed by the above core CT sequence images.

[0069] Step 3: Use the target scanning function of the core 3D image fracture recognition software to scan the 3D data field reconstructed in step 2, and save each target obtained. After the scan is completed, a total of 53 unconnected targets are obtained, such as figure 2Middle (a) picture, from this pict...

Embodiment 2

[0082] Step 1: Use a CT machine to scan the rock core to be processed to obtain 205 core CT sequence images and store them in the computer, such as figure 1 In the middle (b) picture, observing the picture, it is found that in addition to the narrow and long line-shaped targets, there are approximately round and granular targets in the picture, and their gray levels are very close;

[0083] Step 2: Use the image reading function of the 3D core image fracture recognition software to read in the CT sequence image of the core scanned in step 1. The software reconstructs the 3D image of the CT sequence image according to the Marching Cubes algorithm, and obtains the The three-dimensional data field formed by the above core CT sequence images.

[0084] Step 3: Use the target scanning function of the core 3D image fracture recognition software to scan the 3D data field reconstructed in step 2, and save each target obtained. After the scan is completed, a total of 340 unconnected ta...

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Abstract

The invention relates to a core fracture identification method based on three-dimensional image information processing, belonging to the technical field of image segmentation. The method comprises the following steps of: scanning a core to be processed by using a CT (computerized tomography) machine, storing a scanned core CT sequence image in a computer, reading the well scanned core CT sequence image by using core three-dimensional image fracture identification software, performing three-dimensional image reconstruction on the core CT sequence image by utilizing a marching cubes algorithm, and performing a series of calculation, getting and screening processed by utilizing the differences among pores, random noise and fracture in morphological features in a three-dimensional data field to achieve the purpose of identifying a core fracture. According to the method provided by the invention, the core fracture can be fast and accurately identified; and the problems of causing error and even mistake due to negligence of communication information of the core fracture between layers in the existing isolate analysis of each core CT sequence image can be solved.

Description

technical field [0001] The invention relates to an image processing technology, in particular to a method for identifying rock core fractures based on three-dimensional image information processing, and belongs to the technical field of image segmentation. Background technique [0002] In the field of petroleum geology, fracture identification is an important content of reservoir and reservoir heterogeneity research, which is of great significance to oil and gas development and oil recovery improvement. The rock is mechanically damaged under the action of stress, and the fracture structure without obvious displacement is called a crack. Due to the existence of fractures, well-developed fractures and good connectivity, shale and carbonate reservoirs can become valuable reservoirs. [0003] In the late 1950s, geologists in my country's oil and gas fields began to identify the cracks in the core through experience based on the morphological characteristics of the core and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T17/00
Inventor 滕奇志何小海邓知秋杨晓敏李杰
Owner SICHUAN UNIV
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