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Method for extracting natural gas hydrate reservoir pore skeletal structure

A pore skeleton and extraction method technology, applied in 3D image processing, image data processing, instruments, etc., can solve problems such as differences in pore throat shape characteristics, achieve the effect of improving accuracy and reliability, and removing noise

Active Publication Date: 2013-09-25
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] At present, the core pore network model established by the process simulation method and simulated annealing method has been reconstructed, but there are differences with the real core in terms of the shape characteristics of the pore throat.

Method used

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  • Method for extracting natural gas hydrate reservoir pore skeletal structure
  • Method for extracting natural gas hydrate reservoir pore skeletal structure
  • Method for extracting natural gas hydrate reservoir pore skeletal structure

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Embodiment 1

[0030] The method for extracting the pore skeleton structure of the natural gas hydrate reservoir, the operation steps are as follows:

[0031] Firstly, image generation is performed, and Micro-CT technology is used to scan the simulated gas hydrate reservoir filled sand core to obtain the microscopic three-dimensional micro-pore structure image of the simulated gas hydrate reservoir filled sand core, see figure 1 and three Cross-sectional image of dimensional space position density information, see figure 2 .

[0032] Secondly, image post-processing is carried out, and a rectangular area in the center of the sample is selected in the Micro-CT image data by using ImageJ software, see image 3 , and then use Mathematics software to extract the gray histogram of the original image and the selected image, see Figure 4 , use the corrcoef correlation coefficient solving command in the MATLAB software to calculate the correlation coefficient of the two gray histograms. If the ...

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Abstract

The invention relates to a method for extracting a natural gas hydrate reservoir pore skeletal structure. The method comprises the operation steps of firstly, using a Micro-CT technology to obtain a three-dimensional space section image of a rock core of a natural gas hydrate reservoir sample, and conducting threshold processing to obtain binaryzation image data; utilizing C++ language programming to obtain the natural gas hydrate reservoir pore skeletal structure to generate a program on the basis of the principle of a pore network model, and conducting visual generation on the pore skeletal structure by means of the Rhinoceros software. The natural gas hydrate reservoir pore skeletal structure obtained by the method well imitates characteristics of the natural gas hydrate reservoir interior pore structure, and the good geometric structure and the topological structure are beneficial to further analyzing generation and seepage characteristics of the natural gas hydrate.

Description

technical field [0001] The invention relates to the field of research on properties of natural gas hydrate reservoirs, in particular to a method for extracting the pore skeleton structure of natural gas hydrate reservoirs based on Micro-CT technology and pore network model extraction technology. Background technique [0002] With the sharp reduction of traditional fossil energy reserves, countries around the world have paid special attention to the utilization and development of new energy. Among them, natural gas hydrate, as a new type of energy with high efficiency and large reserves, is generally considered to have broad development prospects in the world. Moreover, the United States, Japan and other countries have discovered and exploited natural gas hydrates in their respective sea areas. However, there is still no specific understanding of the reservoir structure of gas hydrate reservoirs, resulting in uncertainty about the formation and seepage characteristics of gas...

Claims

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Application Information

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IPC IPC(8): G06T15/00G06T17/00
Inventor 宋永臣赵佳飞刘瑜刘卫国杨明军张毅王大勇陈玲玉王合明李清平喻西崇
Owner DALIAN UNIV OF TECH
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