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Technical Paper: A Special Application of NMR Logging to Detect Heavy Oil on North Slope Satellite Fields, Alaska
Paper 54608
Abstract
The occurrence and distribution of heavy oil on the North Slope of Alaska is poorly understood, however it may have economic implications, especially for small, newly discovered fields. Wells with a significant portion of heavy oil in the hydrocarbon column may impact the economic performance of the project.
Nuclear Magnetic Resonance (NMR) measurements provide an economic way of evaluating wells where heavy oil might be encountered. The alternative is expensive coring and testing programs. A simple technique utilizing the deficit in total porosity measured with a NMR tool compared to conventional Neutron/Density cross plot porosity may indicate the presence of heavy oil. The T2 distributions measured from the NMR tool show the point at which lighter oil starts to enter the hydrocarbon column.
The results of a case study from a well on the North Slope where NMR measurements identified a heavy oil zone and confirmed with core and RFT analysis will be presented.
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