Detrital input quantification in lacustrine petroleum systems: An example of the pre‐salt source rocks from the Lower Congo Basin (Congo)

This study describes an integrated workflow designed to quantify detrital input into lacustrine deposits in terms of regional extent and total organic carbon content. includes (a) geochemical data such as Rock Eval palynofacies (b) palaeogeographical maps. was applied the immature Barremian source rocks from Lower Congo Basin because a large available set describing complex sedimentary record. From analysis, it demonstrated that matter corresponds hydrogen index higher than 600 mg/g C whereas lower 300 C. The range seen between mixtures matter. correlation content then 50 wells which allowed be mapped at local scales. were plotted on high-resolution palaeogeographic maps for four stratigraphic intervals, BA2, BA2-BA3, BA3-PN BA3-PI. Results confirm periodic presence turbiditic systems allowing strong inputs palaeolake under tropical palaeoclimate, especially BA2-BA3 BA3-PI intervals. These continental-derived material degrade quality richness rock leading decrease initial values. influxes related coastal rivers whereas, deepest parts basin, autochthonous is well-preserved not diluted, deposition exceptional during BA2 All these diagnostics are consistent with importance integrating palaeo-reconstruction depositional environment. It enables constrained both preservation scales given rock.