Abstract
Abstract The residues of six Chinese crude oils have been separated into eight fractions, i.e., saturated, light, middle, and heavy aromatics, light, middle, and heavy resins, and asphaltenes, by solvent treatment and liquid-solid chromatography. The elemental composition and the structural parameters based on NMR spectra of the fractions were obtained. The data show that most of these residues have high nitrogen, nickel, wax, and resin contents, and low sulfur, vanadium, and asphaltene contents. This is convincing evidence that indicates the continental origin of the Chinese crude oils.
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