Abstract
The aromatic fractions of three crude oil samples from Iraq, Iran, and Saudi Arabia were isolated by using the method of silver ion-silica solid-phase extraction. Two series of aromatic steroids were recognized in these fractions using computerized gas chromatography-mass spectrometry corresponding to mono- and triaromatic steroids applying the mass chromatography at m/z 253 and m/z 231. The mass chromatogram traces show considerable differences that allow the use of the aromatic steroid distribution patterns as fingerprint for these oils. The oils contain significant amounts of mono- and triaromatic steroids having the C-24 ethylsteroid skeleton abundant in terrestrial sources. The abundance ratios of the short- to long-chain components of the mono- and triaromatic steroid hydrocarbons, together with the steroid aromatization parameter, indicate that the Iraqi and Saudi oils are at advanced maturity levels relative to the Iranian oil.
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