It is safe to say that rock properties play the main rule in conducting fluid within porous media. Due to the fact that generally the rock data cover only a small portion of the reservoir it is necessary to find a technique to make use of them for the reservoir as a whole. This technique is generally referred as Rock Typing.

There are several methods for rock typing each of them has its own engineering base. The most commonly used methods are porosity-permeability cross plot, Archie's formula based method, capillary pressure, Leverett J-function and flow zone indicator (FZI).

All methods mentioned above have been discussed thoroughly and investigated to see if they are valid to be applied in this case study and it was noticed that none of them is useable. As such a new approach is developed to classify the rock properties of X-Reservoir.

The new approach has the advantage of including the tortuasity of the porous media which is totally ignored by all preceding methods. As a matter of necessity an analytical method was introduced to calculate tortuasity from capillary pressure curves. In fact the new approach applies tortuasity, connate water saturation in addition to capillary pressure, permeability and porosity values to classify rock properties to distinct units.

Based on the new approach three Rock Types have been figured out for X-reservoir. Besides, a Rock Index is extracted to assign a rock type for each grid cell of a simulation model based on its porosity.

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