ZTEM is a patented invention

This entry was posted by Friday, 8 October, 2010
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A geophysical survey system comprising: a first sensor system towed by an aircraft, having at least one airborne sensor for measuring electric components of a low frequency natural electromagnetic field in a survey area; a second sensor system for positioning at a fixed position on the ground during a survey, having at least two ground based induction coil sensors for measuring magnetic components of a low frequency natural electromagnetic field in or near the survey area, the ground based sensors each being oriented to sense the magnetic components in different directions; and a processing system for calculating a set of first vector values over time in dependence on the electric components measured through the first sensor system and calculating a set of second vector values over time in dependence on the magnetic components measured through the second sensor system and comparing one or more characteristics of the first vector values and the second vector values to identify geophysical information about the survey area.

According to another example embodiments is a method of conducting a geophysical survey of a survey region, comprising: measuring, using a towed airborne sensor system an electric component of a low frequency natural electromagnetic field in a survey area; measuring, at a ground based sensor system during a survey, magnetic field components of the low frequency natural electromagnetic field in or near the survey area using at least two stationary induction coil sensors each being oriented to sense the magnetic field in different directions; and calculating a set of first vector values over time in dependence on electromagnetic field data measured through the airborne sensor system and calculating a set of second vector values over time in dependence on electromagnetic field data measured through the ground based sensor system and comparing one or more characteristics of the first vector values and the second vector values to identify geophysical information about the survey area.

According to another example embodiment is an airborne sensor system for geophysical surveying, the airborne sensor system being towable by an aircraft and comprising: a continuous tubular support frame defining at least one internal tubular passage; and a plurality of conductive antenna elements supported at spaced apart locations within the internal tubular passage for measuring electric components of low frequency natural electromagnetic field in a survey area, the antenna elements each having a different relative orientation and measuring the electric components in at least two different relative directions.

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