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Heliborne EM and Magnetism for Hydrogeological Characterization in an Obduction Context - A New-Caledonian ExampleNormal access

Authors: P.A. Reninger, J. Perrin, S. Lesimple, J. Jeanpert, N. Foged and E. Auken
Event name: Second European Airborne Electromagnetics Conference
Session: Data Visualization, Integration and Interpretation
Publication date: 03 September 2017
DOI: 10.3997/2214-4609.201702166
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1010.04Kb )
Price: € 20

Summary:
Airborne Time Domain ElectroMagnetic (TDEM) and magnetic (MAG) surveys have successfully been used for environmental studies. In igneous provinces, TDEM and MAG data may be jointly interpreted for the characterization of the geological environment. In May 2015, a heliborne survey was conducted in New-Caledonia Island (south-west in the Pacific Ocean) over a small area nearby Koné for hydrogeological characterization. The area is hosted by pre-Late Cretaceous metamorphic unit, Cretaceous formations, two volcanic facies and peridotite massifs, relic of the ophiolite nappe. TDEM and MAG data were separately and jointly interpreted in order to characterize the Koné area. Separately, results obtained from the two methods provided new information on the hydrogeological environment and allow delineating the precise limits of the different geological formations. Jointly, the multilayered results were interpreted using a hierarchical ascendant clustering algorithm. Through a statistical classification of three MAG grids and three TDEM grids, it was possible to propose a predictive geological map for the Koné area. The input will help to better manage the groundwater resources and will be used to position new exploration wells.


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