A molecular study of aromatic hydrocarbons in a crude oil from northern. Indus basin was carried out using liquid chromatography and capillary GC-FID techniques. The study revealed high concentration of aromatic compounds (-20% of crude oil). The identification of compounds was made consulting with the literature data. The concentration of individual compounds was calculated by using internal standard method. Kovat indices of 56 compounds using OV-1 column have been reported for reference. Biomarker parameters like, Pr/Ph, Pr/n-C17 and Ph/n-C18 ratios have been applied to assess depositional conditions and any sign of biodegradation: these parameter revealed that Dhurani is a typical non-biodegraded crude oil and was generated under oxic sedimentary conditions, high concentrations of alkyl naphthalene (mono-, di-, tri- and tetramethylnaphthalens) is the products of sedimentary reactions during catagensis and mutagenesis. The ratio of b-substituted isomers of alkylnaphalenes and alkylphenenthrenes were used to assess maturity which revealed high maturity level of crude oil.
M ASIF ,T FAZEELAT ,
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