NB/T 11543-2024Code of practice for borehole transient electromagnetic prospecting in underground coal mine (English PDF)
煤矿井下钻孔瞬变电磁探测技术规程
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
May 24, 2024
Implementation date
November 24, 2024
Scope
NB/T 11543-2024 is the English-translated version of 煤矿井下钻孔瞬变电磁探测技术规程.
NB/T 11543-2024 sets out how transient electromagnetic surveys are run in boreholes in underground coal mines.
The method sets up a field from a transmitting coil and measures the secondary field after switch-off to find geological anomalies whose resistivity differs from the host rock, with readings taken in a three-component borehole coordinate system.
The document covers general requirements, survey design, data collection, processing and interpretation, report preparation and report review, with a record form in an annex.
In-hole, cross-hole and roadway-to-hole variants of the method all fall within it. Issued on 24 May 2024, it has applied since 24 November 2024.
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Document preview — NB/T 11543-2024
National Standard of the People's Republic of China
- ICS
- 73.100.99
- Classification
- D 82
Issued by: National Energy Administration of the People's Republic of China
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 General Requirements
- 5 Construction Design
- 6 Data Collection
- 7 Data Processing
- 8 Data Explanation
- 9 Report Preparation
- 10 Report review
- Appendix A (Informative) Drilling Transient Electromagnetic Measurement Class Report
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 for standardization documents" Drafting.
1 Scope
This document specifies the application of transient electromagnetic detection technology in underground coal mine boreholes in construction design, data collection, data processing, data interpretation, and report compilation.
The basic requirements and implementation procedures in the process of system preparation and reporting review.
This document is applicable to transient electromagnetic detection operations in boreholes in coal mines, including in-hole transient electromagnetic method, inter-hole transient electromagnetic method and tunnel transient electromagnetic method. Hole transient electromagnetic method.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.
GB/T 14499 Geophysical Exploration Technical Symbols
DZ/T 0069 Geophysical exploration map format, legend and color standard
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Borehole transient electromagnetic method
Borehole transient electromagnetic method is a non-contact method based on the obvious resistivity difference between coal seams, surrounding rocks and potential geological anomalies.
The method is to establish an artificial electromagnetic field in the space around the borehole through a transmitting coil, and measure the induction in the formation after the field disappears in the borehole.
The secondary magnetic field is used to detect geological anomalies. This can be used when there is a discernible electrical difference between the detected anomaly and the background rock. method.
3.2 Borehole coordinate system
The drilling coordinate system consists of three components. A, U, and V. A is the axial component of the drilling, which is positive toward the bottom of the hole, and U is on the vertical plane through the drill hole. The borehole is horizontal and the azimuth is 0°.
When the borehole is drilled, the positive direction of U is vertically downward, and the positive direction of V is eastward. Figure 1 shows the three-component directions of the borehole. Fig.1 Schematic diagram of borehole transient electromagnetic detection coordinate system
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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
Normative references
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