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Multi-scale multi-component digital core construction method and system based on image fusion

A digital core and image fusion technology, applied in image analysis, image data processing, image enhancement, etc., can solve the problem of the contradiction between the size of the scanned sample and the scanning resolution, and achieve the effect of solving the contradiction between the size and the scanning resolution

Pending Publication Date: 2021-11-05
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0007] The purpose of the present invention is to provide a multi-scale and multi-component digital core construction method and system based on image fusion, which can effectively solve the problem of contradiction between scanning sample size and scanning resolution, and expand the application of digital rock physics technology in unconventional reservoir evaluation

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[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention will be further described in detail below in conjunction with specific embodiments.

[0040] like figure 1 As shown, a multi-scale and multi-component digital core construction method based on image fusion can accurately analyze core mineral composition and pore characteristics through multi-resolution experimental analysis methods, and fuse multi-source experimental images.

[0041] The method specifically includes two parts:

[0042] 1. Multi-resolution scanning experiment and analysis.

[0043] Multi-resolution supporting experiments of X-ray CT, QEMSCAN and MAPS were carried out on the core, among which X-ray CT is the carrier of three-dimensional digital core construction, QEMSCAN is the technical means of mineral analysis, and MAPS is the identification and analysis of mineral and pore structure characteristics. Extract two-dimensional por...

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Abstract

The invention discloses a multi-scale multi-component digital core construction method and system based on image fusion, and belongs to the field of petrophysics and petroleum logging, and the method comprises the following steps: S1, preparing a core slice, i. e., carrying out imaging and mineral component analysis on the slice to obtain a mineral type, a micropore development degree and a mineral density sequence in imaging; S2, extracting two-dimensional pores in MAPS imaging, determining core pore diameter size distribution characteristics, further determining a proper scanning area, and drilling a sub-sample for X-ray CT scanning; S3, reconstructing the sample subjected to X-ray CT scanning to obtain a three-dimensional grey-scale map, and performing multi-threshold segmentation to obtain a multi-component three-dimensional digital rock core; and S4, adding the pores extracted by the MAPS into the multi-component digital rock core to obtain the multi-scale multi-component digital rock core. The problem of contradiction between the scanning sample size and the scanning resolution can be effectively solved, and the application of the digital rock physics technology in unconventional reservoir evaluation is expanded.

Description

technical field [0001] The invention belongs to the fields of petrophysics and petroleum logging, and in particular relates to a method and system for constructing multi-scale and multi-component digital rock cores by using image fusion technology based on multi-resolution scanning experiment images. Background technique [0002] For unconventional reservoirs with developed nanopores, such as shale oil and gas reservoirs, the distribution of core pore sizes spans a large range from millimeters to nanometers, and digital core models established by single-resolution scanning images cannot fully describe the characteristics of core pore structures. Taking X-ray computed tomography (X-ray CT) as an example, it is difficult for a single scanning technology to solve the contradiction between the scanning resolution and the field of view of the scanned sample. When the scanning sample size is relatively large and the field of view is relatively wide, the X-ray CT scanning resolutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06T5/50G06T7/00G01N15/08G01N23/046G06F111/10G06F119/02
CPCG06F30/20G06T7/0002G06T5/50G01N23/046G01N15/088G06F2111/10G06F2119/02G06T2207/10081G06T2207/20221
Inventor 谭茂金王思宇谢关宝李永杰吴海燕
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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