Magnetotelluric survey in west-central Alberta.

摘要

Magnetotelluric (MT) measurements in the frequency range approximately 0.01-130Hz were made at thirteen sites in west-central Alberta between 53.1;MT data collected from the area, in the form of time series, were processed to obtain plots of apparent resistivities and phases against frequency. These processed data have been used to construct pseudosections (contour plots of apparent resistivities and phases against frequency) along five profiles across the area. The processed data, from each site, were inverted using one-dimensional Fischer inversion to obtain the layer parameters (resistivities and depths). The results from the inversions were used to construct depth section plots along the five profiles. Plan view plots were constructed at various depths. Finally, some preliminary two-dimensional modelling was carried out.;Attempts were made to compare the MT resistivities with resistivities from petroleum exploration well logs for five sites. The objective was to investigate the correlation between the two resistivities but the available log data were found to be inadequate for the purpose. (Abstract shortened by UMI.).