f What can we expect from process-based source rock modelling: Examples from high and low resolution data sets

In order to be able to quantify geological processes in a distinct part of a sedimentary basin, two prerequisites are essential: first, a reasonable description of the most relevant processes taking place, and second, the description of these processes in 3 dimensions. The process-based source rock modelling software OF-Mod 3D aims at predicting source rocks units in sedimentary basins in terms of distribution and properties. It simulates the most important processes relevant for organic matter accumulation in sediments, and the interactions between them. Modelled processes are: supply and distribution of marine and terrigenous organic matter, degradation in the water column, burial efficiency at the sea floor under oxic and anoxic (oxygen minimum zones, anoxic bottom water) conditions, as well as dilution of the organic matter with siliciclastic sediments. The results can be calibrated to or just compared with analytical data from well samples. The advantage of such process-based modelling of organic sedimentation is that the process descriptions substitute to some degree for missing data and therewith the modelling has predictive power. In addition, complex parameter interactions are considered and the influence of each control parameter can be identified easily. In terms of petroleum systems modelling, it is also notable that the process-based forward modelling approach results in initial, not maturity-altered source rock properties. This is important since often geochemical data from exploration wells are heavily maturity altered and thus provide no further information on source rock properties that can be used as input into hydrocarbon generation and migration modelling.<br>