GB/T 42035-2022 English PDF

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GB/T 42035-2022: Determination of pore size distribution of coal and rock - Nuclear magnetic resonance
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Basic data

Standard ID: GB/T 42035-2022 (GB/T42035-2022)
Description (Translated English): Determination of pore size distribution of coal and rock - Nuclear magnetic resonance
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D21
Classification of International Standard: 73.040
Word Count Estimation: 18,128
Date of Issue: 2022-10-14
Date of Implementation: 2022-10-12
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 42035-2022: Determination of pore size distribution of coal and rock - Nuclear magnetic resonance

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of pore size distribution of coal and rock -- Nuclear magnetic resonance ICS 73.040 CCSD21 National Standards of People's Republic of China Determination of Coal and Rock Pore Size Distribution by Nuclear Magnetic Resonance Method Published on 2022-10-12 2022-10-12 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Principle of NMR measurement 2 5 Reagents and Materials 2 6 Device 2 7 Sample Requirements 3 8 Determination of NMR T2 spectrum 3 9 Data processing 5 10 Quality requirements7 Appendix A (Informative) T2 Characteristic Parameters and NMR Porosity Calculation 8 Appendix B (informative) NMR signal data record table 9 Appendix C (informative) NMR data fitting figure 10 Appendix D (Informative) Mercury Intrusion Data Record Table 11 Appendix E (Informative) T2-r Data Record Table 12 Appendix F (informative) Coal and rock pore size distribution results Figure 13

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Coal Industry Association. This document is under the jurisdiction of the National Coal Standardization Technical Committee (SAC/TC42). This document is drafted by. China United Coalbed Methane National Engineering Research Center Co., Ltd., China Coal Science and Industry Group Xi'an Research Institute Co., Ltd. Company, Suzhou Niumei Analytical Instrument Co., Ltd. The main drafters of this document. Hu Xiong, Li Xiaoming, Zhang Peihe, Cheng Qianhui, Jiang Wenping, Zhu Xueguang, Ma Liang, Yang Peiqiang, Shi Meilin, Xu Borui, Yuan Pu, Hou Shujing, Li Chunhu, Wei Zhenji. Determination of Coal and Rock Pore Size Distribution by Nuclear Magnetic Resonance Method

1 Scope

This document specifies the principles, test procedures, calculation formulas, data processing, etc. This document is suitable for the determination of pore size distribution of medium and high rank coal and sandstone, and is used for reference of low rank coal and shale.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. GB/T 474 Preparation method of coal samples GB/T 21650.1 Determination of pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption - Part 1.Mercury porosimetry GB/T 23561.3-2009 Determination methods for physical and mechanical properties of coal and rock - Part 3.Determination method for the density of coal and rock blocks GB/T 29171-2012 Determination of rock capillary pressure curve GB/T 29172-2012 Core Analysis Method SY/T 6490-2014 Specification for laboratory measurement of rock sample nuclear magnetic resonance parameters

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 freeinductiondecay NMR signals that oscillate sinusoidally and decay exponentially. 3.2 T2 relaxation time T2time Time constant describing the recovery process of the transverse component of nuclear magnetization. Note 1.Also known as transverse relaxation time or spin relaxation time. Note 2.It reflects the process that the horizontal component of the non-equilibrium magnetization vector decays to zero. This decay is caused by the inhomogeneity of the local field of the adjacent nucleus and the static magnetic field. disperse phase. 3.3 T2 cutoff value T2cutoffvalue On the NMR T2 spectrum, the boundary of the relaxation time of the movable fluid and the bound fluid. Note. When the relaxation time is greater than this, the pore fluid is called movable fluid; when it is less than the relaxation time, the pore fluid is called bound fluid. 3.4 Inversion inversion The process of obtaining the fluid relaxation signal in each pore from the overall relaxation signal. 3.5 Under the action of an external magnetic field, the spin energy level of an atomic nucleus with a non-zero magnetic moment undergoes Zeeman splitting, and the resonance absorbs a certain frequency of radio frequency radiation. physical process. ......

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