Identification of Flow-units using Methods of Testerman Statistical Zonation, Flow Zone Index, and Cluster Analysis in Tabnaak Gas Field

Introduction:

Interpreting reservoir parameters are important and indispensable for development of oil and gas fields. Because of getting better perception about reserves and flow properties from hydrocarbon reservoirs and being a base for reservoir simulators, methodsof interpreting reservoir parameters are valuable. Different methods result in description of hydrocarbon formation in different scales according to segregation ability, covering and number of measured parameters.

Many efforts had been taken to relate reservoir parameters and one of them is to relate porosity and permeability, so complexity of carbonated rock pore spaces always was very problematic.

Investigators tried to find a logical relation between these two vital parameters in hydrocarbon reservoirs. Assigning flow-units is one of presented techniques that help to recognize permeable reservoir zones and relations of porosity and permeability.

Flow-unit is a method for classification of rock types in pore scale according to flow properties based on geological parameters and physics of flow. These units are sections of the whole reservoir which have constantgeological and petrophysical properties that affect fluid flow, and are different from other sections obviously. Subsurface and surface studies had shown that fluid flow-units are not always coincident with geological boundary. The concept of flow-unit is a strong and peculiar tool for dividing reservoir into units which estimate inter-structure of reservoir in a compatible scale for reservoir simulation models.