NNC

Reservoir simulators use a variety of geometries, ranging from simple structures to complex corner-point systems. In the presence of faults, the physical neighbors no longer coincide with logical neighbors; those physical connections are referred to as non-neighbour connections (NNCs). The fact that horizons cross each other in gridding processes results in the creation of pinch-out layers. Commercial softwares have keywords related to pinched cells that are capable of defining NNCs across cells under the pore volume threshold. That is, direct connections are created across gaps between layers, and the connection is diverted vertically on the local scale. Kraken processes include NNCs visualization throughout the reservoir grid. The NNC tool identifies the regions in the grid where new connections were created due to faulting and presence of other geological features. This kind of analysis is useful to understand reservoir geological modeling as well as comprehend how connectivity/transmissibility parameters driven flow across the reservoir.