Seep and Aeromagnetic surveys
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Seepfinder is a computer controlled, airborne optical spectrometer capable of detecting fluorescence from minute concentrations of hydrocarbons on the surface of water. The ultra-violet components of sunlight cause the polycyclic aromatic compounds in crude oil to fluoresce, and the composite signature of these emissions in the visible spectrum is detected and mapped by Seepfinder. Developed in 1990, Seepfinder has been proven in most of the world’s oil theatres, and is supported by comprehensive computer processing software which compensates the recorded data for changes in environmental and survey conditions. Combined with accurate positional information provided by a GPS satellite receiver, the resulting data provides a high definition map of a surface oil seep. Seepfinder data is multi-channel, providing spectral information which allows the oil characteristics and an indication of gravity (API) to be determined. Gradual changes in seep characteristic on a migration pathway can also provide information relating to porosity and gas drive. Acknowledged to be the world’s most sensitive airborne oil seep detection system, Seepfinder can track the spread of sea surface hydrocarbon films from their emergence points on the sea bed down to the dissolution of the films due to wind and wave action. The data collected can indicate oil type, and when used in conjunction with aeromagnetic and seismic data, Seepfinder can prove source and migration, and will therefore significantly reduce exploration risk. Seep detection often gives the industry the first clues about oil presence in frontier areas, and can save significant time and money, thereby significantly reducing the exploration risk. In addition to Seepfinder, Oilsearch also flies high resolution aeromagnetic sensing systems. Correlation between seabed faults and seepage data increases confidence in Seepfinder data, and provides valuable evidence relating to structure and migration pathways. |
Examples of Seepfinder data
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