Open File Report 2012-09

Open File Report 2012-09

OFR 2012-09

Overview of Airborne-Electromagnetic and -Magnetic Geophysical Data Collection Using the GEOTEM Survey North of Calgary, Alberta

Author(s) Slattery, S.R. Andriashek, L.D. Date 2012-07-19

This report is the third in a series of eight Alberta Geological Survey (AGS) Open File reports that provide an overview of airborne electromagnetic and magnetic geophysical surveys completed over the Edmonton-Calgary Corridor (ECC) by Fugro Airborne Surveys Ltd. These surveys were completed between November 2007 to February 2010 as part of a joint AGS and Alberta Environment and Sustainable Resource Development (ESRD) study to determine the usefulness of the RESOLVE, GEOTEM and TEMPEST geophysical survey techniques in mapping the distribution and physical attributes of sediment- and bedrock-aquifer complexes over areas of formerly glaciated terrain.

The report describes data-collection methods using the Fugro Airborne Surveys Ltd. GEOTEM� survey techniques and data processing. A geophysical interpretation of these data completed for a survey block completed in near Calgary, Alberta, by Fugro Airborne Surveys Ltd. And Larch Consulting Ltd. Is included as an appendix in this report.

The ECC was selected as the first test area to support the AGS-ESRD groundwater mapping program as it represents the region with the highest rates of industrial and urban growth in the province. Since this growth will exert increasing demands on water resources in the ECC, it is necessary to reassess the spatial distribution of previously mapped, as well as unmapped aquifer complexes in the region. By doing so, Alberta may better predict and manage current and/or future stresses on existing aquifer systems caused by industrial, agricultural and urban development. Airborne geophysical survey methods were selected as one of the tools in completing this assessment.

The ECC is an ideal area to evaluate the usefulness of airborne electromagnetic and magnetic geophysical survey techniques due to the wealth of existing surficial and subsurface geological datasets (i.e., geological mapping, lithologs, petrophysical data, field observations, etc.).These datasets provide users with a means to calibrate and verify airborne geophysical data, analyses and interpretations within the ECC.

Slattery, S.R. and Andriashek, L.D. (2012): Overview of airborne-electromagnetic and -magnetic geophysical data collection using the GEOTEM survey north of Calgary, Alberta; Energy Resources Conservation Board, ERCB/AGS Open File Report 2012-09, 168 p.