Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Pemerintah Provinsi Aceh
Dr. Yunus Daud, M.Sc
Banda Aceh, 16 July 2012
Tender Preparation Training : Phase 1
Fundamental Concept of Magnetotelluric Technology
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Outline
1. Introduction
2. TDEM Data Acquisition, Processing and Modeling
3. Static Shift MT Data Correction
4. Example of TDEM Data In Geothermal Exploration
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Introduction
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Basic Principle of TDEM
Time-Domain Electromagnetic (TDEM) methods are based on the principle of using electromagnetic induction to generate measurable responses from sub-surface features.
When a steady current in a cable loop is terminated a time varying magnetic field is generated. As a result of this magnetic field, eddy currents are induced in underground conductive materials.
The decay of the eddy currents in these materials is directly related to their conductive properties, and may be measured by a suitable receiver coil on the surface.
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Basic Principle of TDEM
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Application of TDEM Exploration
Application of TDEM Exploration:
Groundwater Exploration
Mineral Exploration
Salt Water Intrusion
Geologic Mapping
Static Shift Correction of MT Data
Geothermal Exploration
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
TDEM Field Configuration
Courtessy of NGA Inc.
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
TDEM Field Configuration
Record in minutes
Very portable when using batteries
1 to 5 stations/day
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Airborne TDEM
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
TDEM Eddy Curent Flow
Courtessy of NGA Inc.
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
TDEM Waveform
Courtessy of NGA Inc.
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
TDEM Waveform
Courtessy of NGA Inc.
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Useful Equation of TDEM
Courtessy of Zonge Engineering Inc.
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
TDEM Sounding and Model
Courtessy of NGA Inc.
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Static Shift Correction Using TDEM
TDEM Data is inverted in 1-D approach to produce resistivity vs depth
The resistivity-depth parameter is then converted to become MT data (resistivity vs period) using 1-D fwd modelling
The resistivity period is then used for shifting of TE/TM MT data
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
TDEM in Geothermal Exploration
Courtessy of Wameo, 2005
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
TDEM in Geothermal Exploration
Courtessy of Wameo, 2005
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012 Courtessy of Wameo, 2005
Aceh Training : Fundamental Concepts of Magnetotelluric Technology Dr. Yunus Daud, M.Sc, July 2012
Contact: Dr. Yunus Daud, M.Sc. Mobile: 0812-877-2043
E-mail: [email protected]