Application of numerical simulation, flowmeter analysis and conditional simulation for modeling dual-permeability reservoirs

Naturally fractured reservoirs present special challenges with regards to the description of the grid properties required for flow simulation. When the reservoir is considered dual-permeability, both fracture and matrix permeability values are needed for each grid block. Matrix permeability field may be derivable from a transform of well log and core data, but the fracture permeability field cannot be obtained this way and might need to be estimated from well test and any other engineering data. However, the effective permeability derived from well test analysis is associated with a large volume and is a thickness weighted average over a large radius of investigation. This does not yield information that can be used for geocellular modeling. This paper presents a technique of combining reservoir engineering and geostatistical simulation methods for generating geocellular fracture permeability field. The resulting models will be used for reservoir management studies of Hanifa reservoir.