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A set of source‐ and age‐diagnostic biomarkers discovered in the marine oils

Biological markers or biomarkers (Eglinton et al., 1964; Eglinton and Calvin, 1967) are molecular fossils, which were derived from once living organisms through the earth history. They occur in sediments, rocks, and crude oils and display little or no change in structure from their precursors (Peters et al., 2005). Accordingly, biomarkers can be used to indicate organic matter input, rebuild paleoenvironment, and assess the thermal maturation, as well as be applied in oil-oil and oil-source correlation. Most, but not all, biomarkers are isopentenoids, composed of isoprene subunits. In the past two decades, the source-specific biomarkers, e.g. those steroids with unconventional side chains, have been increasingly used to diagnose the depositional conditions or age of the petroleum especially when the potential source rocks could have not be collected. * In this study, a suit of sourceand age-related biomarkers were discovered by GC-MS and GC-MS-MS from the marine oils of Oriente Basin. In addition, the potential source rocks were tentatively distinguished.