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P525 HYPERSPECTRAL DETECTION OF HYDROCARBON MICROSEEPAGE IN THE SANTA BARBARA AREA CA 1 H. VAN DER WERFF 1 F. VAN DER MEER 2 and P.VAN DIJK 1 1 ITC Division of Geological Survey PO Box 6 7513 AA Enschede The Netherlands 2 Delft Technical University Department of Applied Earth Sciences Introduction Oil and gas reservoirs leak. Hydrocarbon seepages are hydrocarbons leaking to the surface through their seal rocks while (hydrocarbon) microseepages are seeping (invisible) light hydrocarbons that can only chemically be detected at the surface. Studying surface occurrences of microseepages onshore may be a prospective tool for oil and gas