Abstract: A method, apparatus, and program product for building an integrated network asset model for an oil and gas production system. A surface production network model associated with the oil and gas production system is retrieved. At least one well object of the surface production network is determined. Fluid properties for the at least one well object are determined based at least in part on a reservoir model associated with the oil and gas production system, and the integrated network asset model for the oil and gas production system is built based at least in part on the surface production network model, the at least one well object, and the fluid properties for the at least one well object.