SEARCH Articles Figures Tables Analysis of Crude Oil Analysis of Oils Analysis of structure Bulk analysis methods Bulk methods Bulk structures Crude fractionation Crude oil Crude oil fractionation Crude oil fractions D Structural Analysis Fraction of oil Fractional analysis Fractionating of oil Fractionation methods Fractionation of oil Fractions of crude oil Heavy crude oil Heavy fractions Heavy oils MS analysis MS method Methods fractions Methods of Fractionation Methods of Structure Analysis Methods of analysis N analysis N-d-M-method Of crude oil Oil structure Oil, bulk Oils fraction Oils, analysis Structural analysis, methods Structural methods Structure M Structure analysis methods