oa Assesing Organofacies Prediction in the La Luna Sea, Middle Magdalena Basin, Colombia: Multiproxy & Statistical Approach

Most key source-rock quality parameters are significantly affected upon thermal maturation. One of the main source rock parameters commonly evaluated during exploration, appraisal, and sometimes development stages is the Hydrogen Index. Similarly, hydrocarbon kinetics has been more recently used to distinguish distinct organofacies (e.g., inner ramp vs. outer ramp lithofacies in the Gulf of Mexico, different Type IIS & Type II subfacies), and as a fluid property-prediction tool.

Here, 152 outcrop samples from La Luna (146) & Umir (6) Formations in the Middle Magdalena Basin, Colombia (MMV) were collected and analyzed using a multiproxy approach combining the stable isotopic composition of carbon in the organic matter (d13CTOC), the total amount of organic and inorganic carbon (TOC & TIC as CaCO3, respectively), and the concentrations of elemental abundances (e.g., Mo, U, Mn, Co, Cu, Cr, Ti, Th), and open system programmed pyrolysis & oxidation. In addition, organofacies prediction based on single run kinetics derived from pyrolysis experiments was added to the model to investigate its influence on the model’s performance.

The resulting prediction model shows promising results from the performance point of view