SY/T 6589-2024 in English
VALIDTechnical specification for onshore controlled source electromagnetic exploration and acquisition
- Issued on:2024-09-24
- Implemented on:2025-03-24
- File Format:PDF
- Delivery:Via email within 5 business days
$572.00
| Standard No: | SY/T 6589-2024 |
| Document status: | VALID |
| Title in English: | Technical specification for onshore controlled source electromagnetic exploration and acquisition |
| Title in Chinese: | 陆上可控源电磁法勘探采集技术规程 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2024-09-24 |
| Implemented on: | 2025-03-24 |
| ICS Classification: | 75.180.10-Exploratory and extraction equipment |
| Chinese Classification: | E11-Petroleum geology exploration |
| Professional Classification: | SY-Oil & Gas |
| Related Keywords: | electromagnetic observation methods
orthogonal electromagnetic field component observation electromagnetic exploration electromagnetic method standard technology technical elements |
Introduction
Analysis of the Evolution of Standard Technology
| Technical Elements | 2016 Edition | 2024 Edition | Improvement Points |
|---|---|---|---|
| Detection Depth | Unclear Upper Limit | ≤12km | Quantitative Construction Standards |
| Observation Methods | 4 Basic Types | 3 New Special Observations Including Chain Array | Adaptability to Complex Terrain |
| Instrument Calibration | 90-day Cycle | Add magnetic rod consistency test | Data reliability is improved |
Core technology innovation
1. Multi-dimensional observation system
The standard clarifies three types of electromagnetic observation methods:
- Time-frequency electromagnetic method: trapezoidal observation area (α≤120°), receiving and transmitting distance 3-15km
- CSAMT: orthogonal electromagnetic field component observation, Carnia apparent resistivity calculation
- Wide-area electromagnetic method: Breaking through the long-range limitation (≥3 wavelengths), single/dual electric field component observation
2. Key parameter calculation formula
Highest frequency cycle: Tmin=2π√(μ0ρHmin/Smin)
Lowest frequency cycle: Tmax=2π√(μ0ρHmax/Smax)
Where μ0 is the vacuum permeability (4π×10-7H/m), ρ is the resistivity (Ω·m)
Analysis of implementation points
1. Measurement network design specifications
| Scale | Line spacing (km) | Point spacing (km) |
|---|---|---|
| 1:50,000 | 1.00-5.00 | 0.05-0.20 |
| 1:100,000 | 5.00-10.00 | 0.10-0.50 |
Note: The main measuring line should be perpendicular to the structural direction, avoiding interference sources such as high-voltage lines ≥500m
2. Quality control standards
Instrument indicators:
- Internal noise <2.5μV
- Distortion <-80dB
- Common mode rejection ratio ≥ 100dB
Acceptance criteria:
- Grade II rate ≥ 80%
- Grade III rate ≤ 2%
- Checkpoint error ≤ 5%
Solutions for special working conditions
Chain array observation (Appendix A)
Applicable to extremely difficult areas such as mountains and towns:
- 1-1, 2-2 and other nodes are arranged alternately on 1/2 of the survey line
- Actual measurement point collection of Ex, Ey and Hz
- Generate virtual measurement point data through vector calculation
Advantages: Reduce the number of actual points by more than 30%
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