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Geochemical characteristics of nitrogen isotope of crude oils in different depositional environments
CHEN Jianfa1, XU Xuemin1,2, SHI Shengbao1
(1.State Key Laboratory of Petroleum Resource and Prospecting in China University of Petroleum,Beijing 102249, China;2.National Research Center for Geoanalysis, Beijing 100037, China)
Abstract:
Nitrogen is an important element in crude oil. Due to the low nitrogen content and high C/N ratio of crude oils, the isotope samples are difficult to be prepared, resulting in the few studies and applications using the isotope. In this work, a series of crude oil samples from several typical sedimentary basins in China were determined to reveal the distribution characteristics and the main influence factors of nitrogen isotope in different sedimentary environments. To measure the carbon and nitrogen isotope values of crude oil samples, the research uses an elemental analyzer (EA) coupled directly to an isotope ratio mass spectrometer (IRMS) , based on Dumas combustion method. The results show that there are obvious differences between nitrogen isotopes of crude oil in different sedimentary environments. The values of the marine sedimentary environment are significantly lighter than the continental sedimentary environment. In the continental sedimentary environment, the composition characteristics of nitrogen isotope in crude oil are related to the salinity and redox condition of the sedimentary environment. The higher nitrogen isotope values appeared in suboxic/dysoxic and slightly saltish water column conditions, which is beneficial to denitrification and thus resulting in heavy nitrogen isotope values in oil.
Key words:  crude oil  nitrogen isotope  Dumas combustion method  sedimentary environments