Abstract
Carbon and hydrogen isotope analyses of 25 crude oils from Northeast Japan have been performed on total oils, saturates, and aromatics. Carbon and hydrogen isotopic compositions of total oils and saturates become heavier with increasing maturity. This relationship between isotopes and maturity of crude oils can be explained by kinetic isotope effects of oil to gas cracking.During oil to gas cracking, excess hydrogen should be required in response to high H/C ratio of generated gas. In the case of oil to gas cracking in reservoirs, all the excess hydrogen required must be generated from within the oil, while in source rocks extra hydrogen could be derived from aromatization reactions within the source kerogen. This difference should change the carbon and hydrogen isotope distributions in crude oils. Gross compositions indicate 2 condensate samples are experienced maturation process in reservoirs and the other samples are matured in source rocks. Two condensate samples showed relatively light isotopic compostions in aromatics. This is probably due to aromatization reactions within the reservoirs. The difference of isotopic distributions of total oils and aromatics between carbon and hydrogen in crude oils supposed to be matured in source rocks indicates excess hydrogen was derived from kerogen.
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