Heterogeneities such as fractures, faults, sand/sandstone interbeds, and solution features play a key role in controlling the flow of reservoir fluids (oil and water) and injected materials (water, steam, surfactant and gel) to and from wells. Critical improvements in oil recovery efficiency can be achieved through an improved understanding of the connectivity of these features. This paper describes the development of discrete feature network (DFN) methods to support IOR activities in heterogeneous and fractured dolomite and sandstone reservoirs. DFN models have been developed to identify the key discrete features that control flow and connectivity, such that the models can be used directly in the design of IOR activities. This paper describes DFN approach to support IOR activities such as: 1. surfactant treatments to enhance a gravity stable recovery process, 2. waterflood displacement, 3. alternative gel treatments, 4. improved targeting of water injection, 5. horizontal drilling to connect with low recovery portions of the reservoir, 6. selective reduction in water cycling by improved gel conformance treatment design and placement, and 7. improved completion placement and stimulation for oil recovery under depletion mechanisms.