NB/T 11515-2024Technical code of practice for surface-borehole magnetic source transient electromagnetic method (English PDF)
地面-钻孔磁性源瞬变电磁法技术规程
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
May 24, 2024
Implementation date
November 24, 2024
Scope
NB/T 11515-2024 is the English-translated version of 地面-钻孔磁性源瞬变电磁法技术规程.
NB/T 11515-2024 is the Chinese energy industry code of practice for the surface-borehole magnetic source transient electromagnetic method, in which a loop source laid on the ground emits a transient field and the induced eddy current response is received in a borehole.
It covers the general principles, technical design, instruments and equipment, field data collection, data processing and interpretation, and the compilation of the results report and submission of materials.
Informative annexes explain how to calculate the primary field magnetic induction, provide field record sheets and quality error statistics, show the workflow and describe typical anomaly responses.
The method serves coalfield hydrogeology and the exploration of hidden geological hazards in coal mines, and similar surveys may use it for reference. Issued on 24 May 2024, it has applied since 24 November 2024.
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Document preview — NB/T 11515-2024
National Standard of the People's Republic of China
- ICS
- 73.020
- Classification
- D 10
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 Principles
- 5 Technical Design
- 6 Instruments and Equipment
- 7 Data Collection
- 8 Data processing and interpretation
- 9 Compilation of results report and submission of materials
- Appendix A (Informative) Calculation of primary field magnetic induction intensity
- Appendix B (Informative) Field work record sheet and quality inspection error statistics table
- Appendix C (Informative) Workflow
- Appendix D (Informative) Typical abnormal response characteristics
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 general principles, technical design, instrumentation, data acquisition, data processing and interpretation of the ground-borehole magnetic source transient electromagnetic method.
Requirements for interpretation, preparation of achievement reports and submission of materials.
This document is applicable to the exploration of coalfield hydrogeology and hidden geological factors causing disasters in coal mines.
Source transient electromagnetic method work can be carried out for reference.
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 prospecting map diagram legend and color code
DZ/T 0153 Specification for Geophysical and Geochemical Exploration Engineering Measurement
DZ/T 0187-2016 Technical specification for ground magnetic source transient electromagnetic method
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Surface-borehole magnetic source transient electromagnetic method
Based on the electrical property difference of underground rock formations, a transient electromagnetic field is emitted underground by using a ground loop source and the induced eddy current field is received in the borehole. Electromagnetic detection methods.
3.2 Three components of borehole
It is composed of three components. A, U, and V. A is the axial component of the borehole, with the positive direction toward the hole mouth; U is on the vertical plane through the borehole, vertical to the
V is perpendicular to U and is the radial component of the borehole. Its positive direction is determined by the right-hand rule. When the borehole is vertical, the positive direction of U is north. Direction, the positive direction of V is west.
Note: Figure 1 shows the three-component directions of the drilling respectively.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 27 pages — is available in the English PDF.
Referenced standards
Normative references
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