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Des FitzGerald: Recent innovative geophysics techniques applied to defining geology under cover - a global perspective
Notícia | 08-05-2013
SEMINARIS DE LA FACULTAT DE GEOLOGIA I L'INSTITUT DE CIÈNCIES DE LA TERRA 'JAUME ALMERA'
Des FitzGerald (Intrepid Geophysics, Victoria, Austràlia)
Hora: 12:00
Lloc: Sala d'actes de l'Institut de Ciències de la Terra Jaume Almera
In the last 2 years, significantly
upgraded airborne geophysical potential field acquisitions systems have been deployed. The quest for practical gravity gradiometry, routinely bettering 2 Eötvös signal resolution and a spatial resolution of less than 180 m is achieved with the digital heli-Falcon system.
Another system, this time a new Full Tensor Gravity Gradiometer (FTG), from Lockheed-Martin has also been announced. Three disparate examples of these breakthrough techniques being deployed practically are:
1: Very large scale surveying in the state of Carajas, Brazil over existing mining operations using the heli-Falcon system.
2: Magnetic gradiometry deployed as a working technology in South Africa, most recently over kimberlite diatremes.
3: In Kenya, the north western rift region has had 70,000 line kms of FTG data acquired, accompanied by rapid identification of drill targets and the most successful "wildcat" oil well of 2012.
Good progress is also reported on innovative applications of geophysics to geology methods:
1: Including an upgrade of "worming" to a 3D quantitative technique, adopted to use full tensor gradiometry.
2: Depth to basement estimations.
3: Using magnetics to create a 3D dyke network semi-automatically. Examples of adaptions of some of these innovations to continental scale geophysical sets will be shown. This is a current activity within Geoscience Australia and Intrepid Geophysics.