| Customization: | Available |
|---|---|
| Accuracy: | Time-Domain/Transient Electromagnetic (Tdem/Tem) |
| Horizontal Line: | Transient Electromagnetic Equipment |
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Introduction
In geological exploration, understanding subsurface structures and materials is crucial for resource identification, environmental monitoring, and geotechnical investigations. Among the various geophysical techniques used for this purpose, Transient Electromagnetic (TEM) equipment has emerged as a powerful tool. TEM involves the use of electromagnetic fields to probe the subsurface, offering distinct advantages in terms of speed, accuracy, and non-invasiveness. This article explores the uses, advantages, and practical applications of TEM in geological exploration.
Advantages of Time-Domain/Transient Electromagnetic (TDEM/TEM) Equipment for Geophysical Underground Exploration
Non-invasive Method: TEM is a non-invasive geophysical technique, meaning it does not require drilling or extensive excavation. This is particularly advantageous in environmentally sensitive areas or regions where access is limited.
High Spatial Resolution: TEM equipment provides high-resolution data, enabling detailed imaging of subsurface structures. This makes it possible to detect smaller anomalies that might be missed by other geophysical methods.
Deep Penetration: TEM can probe deep into the Earth, often reaching depths of several hundred meters. This makes it suitable for exploring large-scale geological features and deep-seated mineral or water deposits.
Rapid Data Acquisition: Unlike some traditional geophysical techniques, TEM can provide fast data collection and processing. The transient nature of the signals means that multiple measurements can be taken quickly, making it suitable for large-area surveys.
Cost-Effective: TEM surveys are often more cost-effective than other geophysical methods, particularly when deep or large-scale investigations are required. The ability to cover extensive areas with relatively few measurements further contributes to its cost efficiency.
Minimal Environmental Impact: Since TEM surveys are non-invasive and do not require substantial land disruption, they have minimal environmental impact compared to traditional exploration methods, such as drilling.
Uses of Time-Domain/Transient Electromagnetic (TDEM/TEM) Equipment for Geophysical Underground Exploration
Oil and Gas Exploration: In some cases, TEM is used to detect hydrocarbons and oil reservoirs. Variations in resistivity can be indicative of the presence of oil and gas, although this application is less common than its use in mineral exploration.
Specifications of Subsurface Mapping TEM Transient Electromagnetic Equipment Geological Groundwater Mineral Exploration Equipment
| Transmitter | |
| Transmitting voltage | ≤200V |
| Transmitting current | ≤50A |
| Current measurement precision | current range before power supply being cut off is 0~50A, display resolution is 0.01A. |
| Power supply frequencies | 0.0625Hz, 0.125Hz, 0.25Hz, 0.5Hz, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32Hz |
| Transmitting waveform | +ON, OFF, -ON, OFF, equal width and dual polarity |
| Turn-off delay time | 1μs~1000μs |
| Turn-off time | ≤1.2μs (pure resistance), changing with the transmitting current and transmitting coil when connecting to the coils |
| Damping resistance | 1000Ω |
| Transmitting coil | 0.1km×0.1km single turn ~ 2km×2km single turn |
| Synchronization mode | external synchronization (cable, GPS) |
| Power supply | internal 12V8.6Ah rechargeable battery (or external 12V power supply) lasting for over 10 hours |
| Dimension | 525×436×217mm 3 |
| Weight | 18.5kg |
| Working temperature | -10°C~+50°C |
| Receiver | |
| Number of channel | 1 |
| Pre-amplification gain | 8, 32 times |
| Main amplification gain | 1, 2, 4, 8, 32, 64, 128 times |
| Band-pass | 0~50k Hz (liner phased filter), full band-pass 0~400k Hz |
| Suppression | 80dB |
| A/D | 16 bit |
| Min sample interval | 1μs |
| Trace number | ≤128 |
| Stacking times | 1~9999 time |
| Synchronization mode | internal 12V9.6Ah rechargeable battery (or external 12V power supply) lasting for over 10 hours |
| Pocket PC | Windows Mobile 6.0 system with software such as Word, Excel, etc., 320x240 true color, 64MB Flash Rom/ 64MB SDRAM/64MB 2GB CF card, able to store over 200,000 readings of sampled data,2 original rechargeable batteries |
| Ports | Bluetooth, infrared and serial port |
| Dimension | 340×295×152mm |
| Weight | 5.3kg |
| Working temperature | -10°C~+50°C |
| 01 | WTEM-2J TEM Receiver |
| 02 | WTEM-2D 15KW TEM Transmitter |
| 03 | Win10 Tablet PC to control the TEM system receiver and the system |
PTT-40A Antenna & Adapter
WTEM-2T/GPS Synchronized Controller
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