Comparative analysis of methods for determination of porosity and permeability cut-off values from core studies
One of the issues of concern in reserves estimation is determination of cut-off values for porosity and permeability of rocks capable of trapping and yielding the petroleum. These values divide the rocks into reservoirs and non-reservoirs, and thereby can be used for validation of volumetric parameters by correlating core analysis and well logging. The paper reviews three most commonly used methods for determination of cut-off values of porosity and permeability (based on laboratory core studies). These are the methods after G.G. Yatsenko and A.V.Ruchkin, V.I. Petersilie and A.V. Chernitsky et al. Variety of approaches applied by the authors to determination of cut-off values for porosity and permeability and classifying the rocks as reservoirs proves that this issue has been and still is of particular and immediate interest to oil experts and researchers. These methods have been used to determine cut-off porosity and permeability of the rocks on the Sirenevskoye field in the Republic of Tatarstan.