Source identification for oil-based drill cuttings on the seabed based on stable carbon isotopes |
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Authors: | Bent Barman Skaare Morten Schaanning Pål Tore Mørkved |
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Institution: | 1. Norwegian Institute for Water Research, Gaustadalléen 21, 0349, Oslo, Norway 3. Department of Environmental Technology, Institute for Energy Technology, P.O. Box?40, 2027, Kjeller, Norway 2. Institute for Energy Technology, P.O. Box?40, 2027, Kjeller, Norway
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Abstract: | This paper demonstrates how stable carbon isotopes can be utilized to identify the source of oil-based drill cuttings discharges
and estimate the time of their deposition. The base-oil used in drilling mud systems may be biodegraded by seabed microflora.
Effects of such processes make it difficult to identify sources of discharges based on the oil’s molecular structure. However,
the stable isotope fingerprint of the base oil may vary for each batch of base-oil. Because carbon isotopic ratios in compounds
with more than ten carbons are resistant to fractionation during biodegradation, this may be used as a tool to identify the
source of drill cuttings discharges. |
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