GB/T 38531-2020Microbeam analysis—Computed tomography (CT) method for micro- and nano-pore structure analysis in tight rock samples (English PDF)
微束分析 致密岩石微纳米级孔隙结构计算机层析成像（CT）分析方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 6, 2020
Implementation date
February 1, 2021
Scope
GB/T 38531-2020 is the English-translated version of 微束分析 致密岩石微纳米级孔隙结构计算机层析成像（CT）分析方法.
GB/T 38531-2020 is the Chinese standard "Microbeam analysis—Computed tomography (CT) method for micro- and nano-pore structure analysis in tight rock samples". Its scope clause reads: This standard specifies the terms and definitions and analysis of computer tomography (CT) technology for imaging of micro-nano-scale pore structures in dense rocks.
Methods, technical requirements, data processing, analysis report content and uncertainty analysis. This standard is applicable to micro-nano-level CT analysis of rocks such as mud shale, dense carbonate rock, tight sandstone, coal rock, and other geological samples. Can refer to implementation. Its clauses include terms and definitions.
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Document preview — GB/T 38531-2020
National Standard of the People's Republic of China
- ICS
- 71.040.40
- Classification
- G 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword I
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Method Overview
- 5 Equipment, equipment and test conditions
- 6 Test Step
- 7 Data processing
- 8 Analysis Report
- References
1 Scope
This standard specifies the terms and definitions and analysis of computer tomography (CT) technology for imaging of micro-nano-scale pore structures in dense rocks.
Methods, technical requirements, data processing, analysis report content and uncertainty analysis.
This standard is applicable to micro-nano-level CT analysis of rocks such as mud shale, dense carbonate rock, tight sandstone, coal rock, and other geological samples.
Can refer to implementation.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB 17589 Specifications for Quality Assurance Testing of X-ray Computed Tomography Equipment
GB/T 27025 General requirements for the competence of testing and calibration laboratories
GB/T 29034 Guidelines for non-destructive testing industrial computer tomography (CT)
GB/T 29070 General requirements for non-destructive testing industrial computer tomography (CT) testing
3 terms and definitions
The following terms and definitions apply to this document.
3.1 X-raypenetrationrate
After the sample is absorbed, the ratio of the X-ray intensity to the light intensity without the sample absorption.
3.2 Pixelresolution
The actual size on the specimen represented by a single pixel.
3.3 Artifact
In the reconstructed sample image, the characteristics of non-samples that appear non-randomly.
Note. Including ring artifacts and linear artifacts.
3.4 Pore
Space in rocks that is not filled with solid matter.
Note. Including caves and cracks.
3.5 Porosity
The ratio of the total volume of pores in the sample to the total volume of the sample. The calculation is shown in equation (1).
P = VP/VS × 100% (1) […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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