Reference

Biomarker chemicals in oil suggest the inclusion of biological material through several key indicators:

1. Preservation of Original Biochemical Structure: Molecular markers in oil are stable through organic matter evolution, preserving the carbon skeleton of the original biochemicals, indicating the biological origin of the oil 1.

2. Distinct Composition for Source Rock Identification: Biomarker compositions can distinguish oils from various source rocks and highlight regional differences, suggesting the biological precursors of the oil 2.

3. Chemical Fingerprinting: Biomarkers serve as complex molecules for chemical fingerprinting in petroleum, derived from biological sources, which aids in tracing the oil back to its source 3.

4. Carbon Isotope Analysis: The carbon isotope of monomer hydrocarbon in oil can reflect the nature of the oil's parent material and its sedimentary environment, providing clues about the biological source 4.

5. Geochemical Indicators: Factor analysis using geochemical indicators, including biomarker distributions, can discriminate oils from different basins, further suggesting the biological material's role in oil formation 5.

These findings underscore the importance of biomarker chemicals in tracing the biological origins within oil, providing a clear link between the biological material and the hydrocarbons found in oil deposits.