Practical AEM: Getting accurate 2D and 3D interpretations
- The workshop will include
- Case studies with follow up ground truthing, where available. Inversion results will be integrated with drilling and other mapping information.
- AEM surveying systems will be reviewed, including towed bird vs centrally placed receiver coils, and helicopter vs fixed wing.
- The fundamentals of FDEM and TDEM.
- Questions will be posed like how to use all of the measured signal (i.e., X & Z measures of the transient B field, bird location etc), and how to determine noise levels.
- The ability to see deeper is critically dependent on finding more useable signal in the late time responses. Late time systematic noise and its source will therefore be discussed.
- System calibration: What a customer should seek from a contractor in terms of measures
- Required innovations on the software engineering to bring more flexibility and performance to the problem domain
- Examples of non-geological sections that have been common in the industry and derived using traditional
- How to create forward models from interpreted geology. This enables you to simulate an AEM survey.
- Finally, we discuss how to control and compensate for deficiencies in the survey data.
Sunday 6th October 2019
8am to 5pm
R1 650 per person (full day)
Student cost: R630 (full day)
Lunch, morning and afternoon tea included
James Macnae (RMIT University)
James Macnae grew up in South Africa, where he graduated with Bachelor’s Degrees in Physics and Mathematics, with Honours in Geophysics. After 3 years as a field Geophysicist with Geoterrex, he moved to Canada and completed Masters and PhD degrees under the supervision of Gordon West. With Yves Lamontagne, his research on ground EM (the UTEM system) led to an award by the SEG of “Best Paper in Geophysics,1984” with Gordon West. Since then Macnae has received two further best paper awards from the Australian Society of Exploration Geophysicists.
Macnae is the author or co-author of many other publications on EM. These include the theoretical “Physics of EM” paper with Gordon West and “Time Domain EM systems” with Misac Nabighian in the SEG volumes on Electromagnetics. Other papers are on ground, borehole and airborne EM acquisition, modelling and interpretation. Macnae has authored patents on Low Temperature Squid sensors and non-contacting ground and airborne electrodes.
After 15 years in Canada, Macnae moved to Australia and was part of the small team awarded the Cooperative Research Centre for Australian Mineral Exploration technologies. Since then, Macnae has completed numerous research projects, including 7 collaborative projects through AMIRA. Program EMFlow developed by Macnae in the 1990’s in the center was the first commercial software for the automatic transform of AEM data to stitched 1D conductivity-depth sections. The software remains in extensive use today. Since then he has been Professor of Geophysics at RMIT University, where he has worked on AEM software and developed fast approximations for AEM data processing in relation to 3D target interpretation and the extraction of Airborne Induced Polarization and Superparamagnetic effects. In 2015, Macnae was a Minerals and Energy finalist in the Australian Innovation Challenge for his work on the ARMIT EM sensor design. He continues to develop sensors for electromagnetic exploration, including low-frequency IP sensors, borehole, ground and airborne sensors, as well as novel GPR antennas for physical property mapping.
Macnae is a Gold Medallist of the Australian Society of Exploration Geophysicists.
Jovan Silic : Biography
Jovan Silic is a director and principal consulting geophysicist with Jovan Silic and Associates Melbourne Australia. He has a successful association with a mineral exploration industry over a period of thirty five years in a wide range of geological environments spanning five continents.
He graduated from University of Western Australia with a Bachelor of Science (Honors) First Class, and in 2000 obtained a Ph.D. (Geophysics) degree from Macquarie University, New South Wales, Australia, on the topic of interpreting TDEM data . Application of and research into electrical methods to exploration problems is a one of the areas of his specialization.
As an exploration geophysicist he has made important and innovative contributions to the discoveries of a number of world class economic base/precious metals deposits, and diamond exploration projects.
His industry experience includes working with government organizations on regional data compilations, major resource companies such as Cominco Ltd (Canada) , Chief Geophysicist with Aberfoyle Resources (Australia) , and twenty years as a consulting geophysicist, working on major mineral and oil and gas exploration (and research) projects within Australia, Canada, South East Asia, Central Asia , South America and Europe. For ten years was on the Advisory Board to the Co-operative Research Center for Australian Mineral Exploration Technologies.
His current development and research projects are focused on the modeling and inversion of AEM data at a survey scale.
Des Fitzgerald (GEOINTREPID)
Des is the MD of Intrepid geophysics. Des brings an engineering perspective to 3D geology modelling and simulations. He completed his PhD in 3D finite elements at Melbourne University in 1976 jointly with the French Geological Survey, BRGM, the Geometry factory and INRIA. Intrepid Geophysics has specialized in the integration of geology and geophysics at a regional scale for many years.