Diamondoids are the most stable molecules in petroleum and their concentrations increase as oil begins to crack, These diamondoids continue to increase as further cracking occurs, even to dry gas.

The presence of relatively-high concentrations of both diamondoids and biomarkers in the same oil indicates that the oil is a mixture derived from sources at very different levels of maturity.

It is difficult, or impossible, to recognize such mixtures by any other means. And recognizing these mixtures and identifying the different sources using biomarkers, QEDA, and CSIA-D are key to developing new and improved basin models generating new exploration plays, which can include deep light liquids and gas.