Thiel Surface Impedance Method
The Thiel Surface Impedance Method (TSIM)
enables low cost, minimal impact appraisal of subsurface geology and structure.
This technique allows the interpreter to accurately delineate known geological
features and identify previously unrecognised discontinuities. This has the
potential to enable a considerable time and cost saving to be made when planning
and implementing drilling programs to define the orebody.
The TSIM Tool is a passive surface
electromagnetic device that uses VLF radio waves at a single frequency to
measure apparent resistivity changes in the subsurface, thus enabling impedance
measurements to be made. One person can easily manage field operation of the
lightweight battery-powered equipment, making it a very cost-effective method
for surface exploration work.
The light weight and passive nature of the tool also makes it a very safe device to operate.
technique has proven particularly successful in locating the line of oxidation
(LOX) at various sites in the central Queensland coalfields. This has resulted in a significant reduction of LOX drilling
and considerable cost saving.
TSIM has proven useful in the
identification of geological structures such as dykes and faults.
The TSIM Tool has also demonstrated
success in mineral exploration and mining, including the determination of the
extent of mineralisation boundaries in sulphide deposits.
The instrument has considerable hydrogeological
applications. It can be used to provide details on the water table, including
the presence of palaeochannels and perched aquifers.
TSIM is a powerful, cost effective
tool. It is versatile, safe and has the potential to provide invaluable data in
many diverse environments.
Measurements of the magnetic field,
electric field and phase are used to calculate the apparent resistivity and
phase angle at each point on the traverse. The lateral conductivity changes as
present at the line of oxidation, faulting or intrusions provide strong
geophysical anomalies that can be mapped by TSIM.
|GeoConsult Global Ltd provides a complete service from survey planning and
design, access to the TSIM equipment, data acquisition, interpretation and
professional reporting. GeoConsult Global Ltd welcomes any inquiries regarding TSIM