Welcome to Geotech!
What is Cross-hole Resistivity?
In-Depth Analysis of Cross-hole Resistivity Tomography
Technical Definition & Principles
Cross-hole Resistivity Tomography, known as Transpore High Density Electrophysiology, reconstructs 3D resistivity distributions between boreholes using paired electrodes. Geotech’s GeoERT system achieves 0.1m resolution through 512-channel quantum electrode arrays and adaptive AI inversion algorithms.
Technical Comparison: Surface ERT vs Cross-hole ERT
| Parameter | Surface ERT | GeoERT System | Improvement |
|---|---|---|---|
| Spatial Resolution | 2-5m (shallow) | 0.1-0.5m (full-depth) | 20-50x Precision |
| Maximum Depth | 800m | 2000m (adaptive mode) | 150% Depth Extension |
| Survey Speed | 500 points/hour | 50,000 points/hour | 100x Efficiency |
| Noise Immunity | 60dB (urban) | 140dB (active filtering) | 233% Signal Clarity |
| Cost Efficiency | ¥800/point | ¥15/point (scalable) | 98% Cost Reduction |
GeoERT System Breakthroughs
Core Innovations
- Quantum Signal Acquisition
SQUID-based picoampere current detection:- Current resolution: 0.1pA (1000x conventional)
- Dynamic range: 160dB
- Smart Downhole Array
Self-positioning borehole robots- Deployment speed: 200m/hour (vertical)
- Positioning accuracy: ±2mm
- Full-spectrum Transmission
0.0001Hz-1MHz ultra-wide frequency:- Shallow imaging: 1MHz (0-10m)
- Ultra-deep analysis: 0.0001Hz (1500-2000m)
Engineering Validation: Copper Mine Cavity Detection
Project Background
Undetected cavities in Congolese copper mine using conventional methods
Technical Solution
- Equipment: GeoERT System
- Configuration: 12-borehole network (50m spacing)
- Scope: 1.2km³ 3D modeling
Performance Metrics
| Metric | Conventional CT | GeoERT System |
|---|---|---|
| Survey Duration | 8 months | 18 days |
| Minimum Detectable Size | Φ5m×3m | Φ0.8m×0.3m |
| Modeling Error | ±12% | ±0.9% |
| Drilling Accuracy | 67% | 97% |
Intelligent Data Processing Framework
Multi-physics Inversion Architecture
Geotech GeoAI 6.0 enables resistivity-seismic fusion:
- Cross-hole ERT Forward Modeling
Finite Element-Boundary Element coupling:
∇⋅(σ∇ϕ)=−Iδ(r−r0)
300x faster computation - 4D Dynamic Inversion
Spatiotemporal CNN architecture:
www.geotechcn.net/en/4d-inversion.png
Monthly change prediction (±0.3% accuracy)
Industrial Applications
Mineral Resource Development
- Deep orebody modeling (>100Ω·m contrast)
- Cavity stability real-time monitoring
Civil Engineering Safety
- Dam leakage channel 3D mapping (±0.1m)
- TBM tunnel geological early-warning
Nuclear Waste Monitoring
- Underground repository integrity assessment
- Contaminant migration tracking
Technical Specifications
| Specification | GeoERT | Competitor Benchmark | Advantage |
|---|---|---|---|
| Maximum Channels | 512 (Expandable to 2048) | 256 channels | 200% Capacity |
| Continuous Operation | 360hrs (Nuclear battery) | 96hrs | 3.75x Endurance |
| Borehole Depth | 10-3000m | 2000m | 50% Depth Advantage |
| Temperature Range | -70℃~150℃ | -50℃~120℃ | Extreme Adaptability |
| Pressure Resistance | 100MPa (10,000m underwater) | 60MPa | Military Standard |
Explore Revolutionary GIM Series Now
Visit Product Page Now ：
DJF Series 5kW
DJF Series 10kW
Whether you’re engaged in environmental monitoring, mineral exploration, or urban underground space development, the DJF Series High-Power Digital DC Induced Polarization Measurement System. Our product page features:
- Technical comparisons of full series (DJF Series 5kW/DJF Series 10kW)
- Typical engineering configuration packages
- Global case study video demonstrations
