安定同位体比 (¹³C/¹²C) 質量分析法による原油の炭素同位体比測定

抄録

To know about characteristics of crude oils with mass spectrometer, the carbon isotopic ratios measurements of 86 samples of crude oil from foreign and domestic fields were carried out.
A quartz tube was used as a combustion vessel and vanadium pentoxide as an oxidation agent. A mixture of crude oil and vanadium pentoxide placed in the quartz tube was vacuumed and then sealed. This was heated for 2 hours at 900°C in electric furnace. Produced carbon dioxide was introduced to mass spectrometer to determine isotopic ratio.
Foreign oil samples showed -27.7--22.0‰, as δ¹³C values. Results of domestic crude oils showed -24.0--24.1‰ in Hokkaidou, -24.5--21.9‰ in Akita, -23.7--21.7‰ in Yamagata, and -24.8--21.3‰ in Niigata, as δ¹³C values, which agreed well with the results of the Tertiary period oil in North America.