Analysis of condensate oil by comprehensive two-dimensional gas chromatography

Abstract

Twenty-two condensate oil samples from the Sichuan Basin are analyzed by comprehensive two-dimensional gas chromatography (GC×GC). Light hydrocarbon components are separated completely without the influence of co-eluting peaks, and the fingerprint information of light fraction such as propane remains intact. Sixty-seven compounds are detected in the range of nC3-nC8 by using GC×GC, 13 more than the compounds recognized in the conventional gas chromatography (GC). These compounds are divided into 12 compound classes by GC×GC according to the structure. Coupled with flame ionization detector (FID), some compounds that can not be analyzed quantitatively by other methods are quantified, including isoalkane, alkyl cyclopentane, alkyl cyclohexane, other single cycloalkane, polycyclic alkane, adamantane, alkylbenzene and polycyclic aromatic hydrocarbon and so on. The quantitative analysis results of more than 180 main compounds and the 12 compound classes by GC×GC will offer more technical assistance for petroleum geochemical researches to get new parameters of maturity estimation and oil-source correlation of condensate oil. Key words: comprehensive two-dimensional gas chromatography, flame ionization detector, time-of-flight mass spectrometry, condensate oil, family component quantification