Understanding C27/C29 Steranes for Oil Exploration in Guyana Suriname Basin

Post 3.
Canje Sourced Oils.
Organic Geochemistry.
Brain-breaking for simple geologists.
Fortunately.
We had prof.dr. John Hunt as our scientific guide during the geochem and Maracaibo Basin study.
Loooong ago, in Intevep, PDVSA.

To explain all these molecular mysteries and their application on petroleum exploration.
…Como el cuentico de Capullo y Sorullo…

But most certainly peanuts, daily bread.
For all those smart and most clever organic geochemists.
That can explain this much, and much better.

What Are C27/C29 and C28/C29 Steranes, and Why Are They Important?

Steranes are molecular fossils derived from sterols in ancient organic matter, preserving a geochemical “fingerprint” of the original depositional environment.
   •   C27/C29 Steranes Ratio: Reflects the balance between marine algal input (C27) and terrestrial plant-derived input (C29). Higher C27 suggests marine algal dominance, while higher C29 indicates terrestrial organic matter contribution.
   •   C28/C29 Steranes Ratio: A key marker for marine carbonate-rich vs. siliciclastic (shale) environments. Higher C28 is often linked to marine carbonate or shale settings, while lower C28 suggests more terrestrial influence.

These sterane ratios serve as excellent biomarkers because they remain chemically stable over geological time and provide a direct link to the type of source rock and depositional conditions, allowing geochemists to distinguish different oil families and correlate them to specific source rocks like the Canje Formation in Suriname & Guyana.

…Capullo y Sorullo…
https://lnkd.in/eNwNX9fR