Log-based Estimation of Total Organic Carbon Content (TOC): An Insight from Suriname Offshore

Total organic carbon content (TOC) serves as a pivotal parameter in assessing potential source rock, typically evaluated through the examination of cores, cuttings, or sidewall cores in a laboratory equipped with source rock evaluation instruments. However, this conventional method faces constraints due to the limited availability of rock samples, leading to a discrete estimation of the TOC that does not fully represent the entire spectrum of a source rock bed. To address these limitations, the integration of continuous, high-resolution logging information emerges as a promising solution. In this study, the TOC values measured from the geochemical analysis of core samples, i.e., Rock-Eval, are used to correlate with the TOC computed using the CARBOLOG® method. A total of 5 wells and 346 Rock-Eval samples were used for the study. The results were then used as input for the Petroleum System Modelling (PSM) to model the potential source rock accumulation in the Suriname water. The model successfully predicts the hydrocarbon accumulation with a proven drilled well resulting in oil discovery in the recently drilled well namely Roystonea