Prospect evaluation based on integrated petroleum system analysis: Block E case study, south-eastern edge of Precaspian Basin (Kazakhstan)

Abstract Generative potential and thermal maturity for Upper Palaeozoic source rocks from the south-eastern edge of Precaspian Basin were determined using Rock–Eval. A high hydrocarbon rock generative degree Lower Permian, Mid-Carboniferous strata have been revealed based on 39 samples. TOC values 0.4–5.5% obtained mature rocks. Integrated geochemical analysis Rock–Eval studies combined with 1D basin modelling was utilized in order to reconstruct evolution Calibrated models three wells had constructed understand petroleum system. For two deep exploration (Nur-1 Tassym SE-1), which penetrated pre-salt at depths 5.7 7 km, respectively, impact salt diapirism timing maturation modelled. Type II kerogen used, is previous palaeogeographic studies. The stratigraphic framework major stages geodynamic analysed. Salt-related structural traps post-salt described 3D seismic data, additional intra-salt sediment packages delineated. Discovered producing oil fields Triassic Jurassic–Cretaceous sections are mainly confined four-way dip closures above steep flanks structures. Based burial modelling, generation behaviour below salt-related minibasins close thick diapirs inferred. Permian SR type kerogen, peak (maturity over 50%) occurs Middle Late Jurassic. predominantly carbonate terrigenous-carbonate marine SR, earlier withdrawal minibasins. Implications deeper prospectivity made study area, methodology evaluating adopting technique data presented.