Rhenium-Osmium, unlike traditional techniques, has the power to provide a quantitative determination of the depositional age of the source rock and the timing of oil generation. Coupled with trace element geochemistry, which permits high resolution characterisation of oils, this service identifies the oil families present, and allows quantification of oil charge and oil mixing events in the basin.
Rhenium-Osmium oil geochronology focuses on the asphaltene fraction of the oil, as this heavy fraction is where the majority of the metals, including Rhenium and Osmium, reside. Furthermore it has been demonstrated that the asphaltene fraction of an oil reflects that of the whole oil. As we analyse the asphaltene fraction of an oil we can also analyse oil stained sands, bitumen, tar mats and highly biodegraded oils which are unsuitable for typical organic geochemical techniques such as Biomarkers.
The application of Rhenium-osmium geochronology to oil samples allows us to date the timing of oil generation, a key input to petroleum system models. this technique also allows us to resolve out oil mixing events in the basin. Furthermore we are able to calculate the initial Osmium isotopic composition of suites of oil at the time of oil generation. This value is inherited from the source rock during oil generation and therefore can be used to identify the source of the oil.
Chemostrat are able to provide high resolution compositional characterisation of oils, thus identifying oil families, through the application of trace elements. Chemostrat have developed this service as a time-efficient and cost-effective technique to characterise oils and aid with oil-source correlation. This technique can be easily integrated into the Re-Os geochronology dataset, to draw further conclusions regarding individual expulsion events, oil mixing and reservoir connectivity.