oil-oil correlation of asmari and bangestan reservoirs using gas chromatography and stable isotopes in marun oilfield, sw iran*
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abstract
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.
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Journal title:
iranian journal of science and technology (sciences)ISSN 1028-6276
volume 31
issue 3 2007
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