Petroleum systems models are 1D, 2D, or 3D large-scale geologic models. These models cover areas ranging from a single charge area for a prospect to regional studies of entire basins to resource assessments of mega-regional scale covering multiple basins. The models provide a complete record of the evolution of a petroleum system, including pressure and temperature hi​story. They relate the structural evolution of a basin to generation, migration, accumulation, and loss of oil and gas in a petroleum system through geologic time. Properties such as gas/oil ratios and API gravities can be analyzed, understood, and predicted. A petroleum systems model provides the only means to integrate all physical aspects (source, trap, seal, and reservoir) and time (charge) to quantify and analyze processes and reduce exploration risk. Model geometry Dynamic: changes during simulation based on deposition and compaction (backstripping) or structural restoration (TecLink) Layers: sequence of geological layers, deposited in a given stratigraphical event and subdivided into regions of similar facies Facies: to specify the lithological rock type and the organic facies, including quantities such as permeability, compaction parameters, heat capacities, thermal conductivities, and geomechanical properties Boundary conditions: paleo water depth, heat flow, and sediment water interface temperature Special submodels: contained in the model (faults and fault properties, cementation, thermal calibration parameters, salt movement, erosion, intrusions, fluid phase properties, secondary cracking, and geomechanics) Local grid refinement: for areas of interest or in specific stratigraphic units TecLink: for complex extensional and compressional tectonic environments with overthrusted layers and faulted geometries Model scale From around 10 × 10 km to more than 1,000 × 1,000 km, and down to a depth of 100 km The entire geologic history of a basin on geologic timescales The entire stratigraphy in your definition of resolution (more than 100 layers) Local grid refinement for locally refined, high-resolution models within a larger PetroMod model (e.g., a higher-resolution prospect area within an existing regional 3D PetroMod charge model)