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- W2077309020 abstract "Abstract Asphaltenes are suspected to be essentially small solubilized, less condensed kerogen moities. These materials should then be excellent for use in evaluation of source environments and as source rock-oil correlation parameters. This study compares chemical and isotopic compositions of asphaltenes extracted from a 100 m continuous core through the Kimmeridge shale of the North Sea with associated resins (NOS), as well as with both resins and asphaltenes from the oil of the adjacent sandstone reservoir, which is in contact with the shale. Through gel permeation chromatography, two distinct classifications of molecular weight (MW) distributions for the asphaltenes of the source rock extracts are observed: (1) A high MW range (5000–30000 daltons) which is associated with enriched carbon isotopic signatures (−25 to −26‰) and (2) a lower MW range (1500–5000 daltons) which correlates with more common samples having depleted isotopic compositions (−28 to −30‰). In similar fashion, the high MW asphaltenes show increased concentrations of longer chain length alkyl groups (nC22 and greater) which are released through pyrolysis gas chromatography. Resins associated with the high MW asphaltenes have a greater high MW content than resins from the more common kerogens. Coincidences of high carbonate are also noted in most isotopically anomolous samples. These data indicate a changing depositional environment, probably associated with an increasing bacterial component and recycling. An increase in MW of asphaltenes in the reservoir oil was observed and suggests further condensation of these structures may occur in the reservoir following migration or increased level of maturity. Carbon isotopic compositions of specific MW fractions of resins and asphaltenese support the hypothesis that high MW asphaltenes and resins are precursors in low MW asphaltene and resin generation" @default.
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- W2077309020 date "1988-01-01" @default.
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- W2077309020 title "Variations in geochemical character of asphaltenes from a source rock in contact with an oil reservoir" @default.
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- W2077309020 doi "https://doi.org/10.1016/0146-6380(88)90046-0" @default.
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