oa Multipulse Airborne TEM Technology and Test Results Over Oil-sands

The MULTIPULSE™ technology enables a time-domain electromagnetic (TEM) system to transmit a high power pulse and one or multiple low power pulse(s) within a half-cycle. The high power pulse ensures good depth of exploration and the low power pulse allows a fast turn off and earlier off-time measurement as well to provide higher frequency information, thus allowing higher near surface resolution and better sensitivity to weak conductors. The MULTIPULSE technology can be applied to current airborne TEM systems such as the HELITEM® and GEOTEM® systems to increase their geobandwidth. The addition of the small pulse extends the range of the sensitivity tenfold toward the weak conductors and therefore expands the scope of applications of the TEM systems. We have field tested the HELITEM and GEOTEM MULTIPULSE systems in Fort McMurray, Alberta, Canada, over a typical oil sands geologic setting. The results demonstrate the effectiveness of the MULTIPULSE technology, showing comparable shallow geological resolution of the MULTIPULSE to that of the frequency-domain RESOLVE® system while maintaining superior depth of exploration.