Fracture systems observed in naturally fractured reservoirs (NFRs) tend to be hierarchical ( Figure 1 ): (1) regional faults going through the reservoir or forming the reservoir boundaries and in-field seismically mappable faults; (2) fracture corridors sometimes associated with faults and (3) background fractures. Vertically, background fractures tend to be impacted by mechanical stratigraphy while fracture corridors and faults usually cross-cut through the reservoir units ( Figure 2 ). For fractured carbonate reservoirs, background fractures are usually more abundant but with much lower effective permeability than fracture corridors, and must be treated differently in a reservoir model.


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