Airborne Gravity 2010 - Geoscience Australia

Airborne Gravity 2010
interpretation purposes, the full tensor component data must be of high quality. An advantage of the
invariant approach is that it permits rapid interpretation of the data.
Figure 5. Marine-FTG ® survey data from the Nordkapp Basin offshore Norway. (a) Survey
location, (b) bathymetry corrected Tzz, (c) lineament amplitude map, and (d) lineaments plotted
over a colour bathymetry-corrected Tzz image.
Summary and discussion
The following summarises the principle achievements made with Air-FTG ® technology since 2004.
Many of the successes have come from an increased understanding of what is possible with full tensor
data and what is required to ensure high quality data is produced on a consistent basis.
� Air-FTG ® survey data consistently acquired in a relatively low noise environment with residual
noise levels < 7 Eo 2 km.
� Tzz detectability of 2 Eo over 200 m wavelengths on BT67 Air-FTG ® surveys and 2 Eo over
300 m wavelengths for Cessna Grand Caravan surveys.
� Innovative QC procedures that make use of all FTG outputs employed to improve acquisition
performance.
� A Full Tensor Noise Reduction technique developed, leading to enhanced S/N ratios in final
processed data.
� Invariant Analysis of high quality full tensor data used for direct geological feature targeting
and lineament mapping.
The airship gravity project demonstrated that airborne gravity is a viable methodology for high
resolution mineral and petroleum exploration applications. It also encouraged the development of new
approaches to ensure high levels of geological signals in the measured data are captured, be this from
tools developed for better QC or through data processing noise reduction methods. The application of
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