Residency of rhenium and osmium in a heavy crude oil
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The Re-Os geochronometer is an emerging tool for the study of oil formation and migration processes, and a new technology for petroleum exploration. Very little is known, however, about the residency of Re and Os within asphaltene and maltene sub-fractions of crude oil. This information is crucial for better understanding of petroleum systems in general, and especially for successful geochronology of key processes such as oil formation, migration, or biodegradation. In this work, a heavy crude oil was separated into soluble (maltene) and insoluble (asphaltene) fractions using n-heptane as the ...