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EMpulse Geophysics Ltd.


Darnley Bay TAMT Survey - case history pertaining to a Transient AMT survey near Darnley Bay, NWT, published in the February, 2015 edition of the Recorder. Please click here to download the file.

TAMT vs. AMT - presented at the Natural Fields Symposium, ASEG 2012, Brisbane, Australia, transient and conventional AMT data collected on the same line with both crews in the survey area at the same time are directly compared. Despite the fact that our first generation TAMT coils were ten times noisier > 1000 Hz and four times noisier < 100 Hz, the TAMT impedance estimates (APS) are arguably as good as the conventional ones (Robust remote-reference) whereas the TAMT (APS) tipper estimates are clearly better. This shows the effectiveness of our transient approach to AMT, time localized recording of high SNR transients which are further SNR enhanced with our APS algorithm. Please click here to download the file.

3D Inversion at Pasfield Lake - presented at the 2010 SEG in Denver, Colorado, 3D inversion enhanced the interpretational power of the TAMT data at Pasfield Lake significantly by being able to fit the data to its full structural complexity, this was especially effective on the outermost 5 km of the lines where 3D geologic conditions were strongest. Three-dimensional inversion of the TAMT data at Pasfield Lake, done one line at a time, returned models in good agreement with drill defined lithology and with models returned from completely independent 3D inversion of potential field data. Please click here to download the TAMT specific case history. Please refer to the "Surveys - Uranium" section as well.

A more general Pasfield Lake case history, presented by Ken Witherly, also at the 2010 SEG, please click here to download the file.

Sophie Hautot and Pascal Tarits of Imagir presented the results of their 3D grid inversion of a sub-set (every second station omitted) of the Pasfield TAMT data set at the Beijing GEM conference in 2011, please click here to download the expanded abstract.

Deep Uranium Exploration, Virgin River trend - presented at the 2005 SEG in Houston, Texas, this case history shows that TAMT can be used effectively to map sandstone alteration at depths exceeding 600 m and graphitic shear zones at over 1.1 km depth. However, it's also found that when looking for a strong conductor (100 S) within a spatially large, weakly conductive block (10 S), the current channeling response of the  weakly conducting block dominates, please click here to download the file.

 Adaptive Polarization Stacking - presented at the 2001 SEG in San Antonio, Texas, we show that, both theoretically and practically, that our Adaptive Polarization Stacking (APS) algorithm has a "super-exponentional" bias convergence which outperforms conventional remote-reference in terms of level of bias given transients with typical polarization characteristics, please click here to download the file.