مقاله OIL-OIL CORRELATION OF ASMARI AND BANGESTAN RESERVOIRS USING GAS CHROMATOGRAPHY AND STABLE ISOTOPES IN MARUN OILFIELD SW IRAN*

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بخشی از متن مقاله OIL-OIL CORRELATION OF ASMARI AND BANGESTAN RESERVOIRS USING GAS CHROMATOGRAPHY AND STABLE ISOTOPES IN MARUN OILFIELD SW IRAN* :

سال انتشار : ۲۰۰۷

تعداد صفحات :۲۲

For this study, Asmari (Oligo-Miocene) and Bangestan (Cretaceous) reservoir oils from theMarun oilfield were studied geochemically. Gas chromatograms and stable isotopes of carbon and sulfur indifferent oil fractions were studied. Normal alkanes nC15+ are as high as 93% with a saturate percentage up to53.9% which reveal a high maturity of Asmari and Bangestan reservoir paraffinic oils. Carbon PreferenceIndex of both reservoir oils are around one, indicating mature oil samples. Pr/nC17 and Ph/nC18 ratios haveconfirmed this conclusion. The Pr/Ph ratio is less than one and the plot of δ13CAro.(‰) versus δ13CSat.(‰) bothindicate a marine reducing environment during the deposition of their source rocks. The organic matterdeposited in these sediments is of kerogen Type II (Algal). Stable carbon isotope results versus Pr/Ph ratioindicate that both oils originate from the same shaley limestone of the Mesozoic age. This study also provesthat H2S gas polluted Asmari oils have a similar isotopic range as Bangestan reservoir oil, hence the source ofcontamination must have originated from the Bangestan reservoir. Isotopic and geochemical results, for thefirst time, introduce three oil families; two H2S polluted families and one non-H2S polluted oil family; in theentire Marun oilfield.