permeability estimation and hydraulic zone pore structures

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Y. B. Adeboye, C. E. Ubani, K. K. Farayola/Petroleum & Coal 54(1) 52-58, 2012 57presented in Figure 5 is accurate. This curve can be used for comparisons, in this well, toTimur permeability estimations and to statistical permeability with fewer core samples.5. ConclusionsFigure 5 Core log vs. log permeability in Sandstone Reservoir1. A method has been found to link core plug permeability to well log measurements inrelational databases. Core plugs of approximately 20ml volume have a permeability valuewhich can be uniquely linked to log measurements.2. Well logs respond differently in different hydraulic zones.3. If the entire range of permeability from all hydraulic zones is included in a core - logdatabase, it is possible to predict permeability accurately enough to represent changes inpermeability across a reservoir. Databases constructed at “key” wells can be used to predictpermeability at offset wells.4. Permeability predictions are good in sandstone reservoirs if permeability is predictedby Kriging with a multi-dimensional database calibrated for each hydraulic zone.Permeability predictions from porosity-permeability transforms were of little value casestudy presented.5. Standard gamma ray, density, and resistivity log suites and routine core analysesprovide enough data to predict permeability from well logs.Nomenclature:S wir = irreducible water saturation, %H c = hydraulic character, dimensionlessHZ = hydraulic zonek = permeability, (md)ϕ = porosity, fractionr 2 = goodness of fit correlationS pv 2 = specific surface area per unit pore volume, 1/cm
ReferencesY. B. Adeboye, C. E. Ubani, K. K. Farayola/Petroleum & Coal 54(1) 52-58, 2012 58[1] Ahmed, U.,Crary S.F., Coates, G. R (1991).: “Permeability Estimation: The VariousSources and Their Interrelationships,” .Journal Of Petroleum Technology,pp.578-567.[2] Amaefule, J.O., Altunsbay, M., Tiab, D., Kersey, D.G., Keelan, P. K(1993).: EnhancedReservoir Description: Using Core and Log Data to Identify Hydraulic (Flow) Units andPredict Permeability in Uncored intervals/wells, SPE Paper 26436, presented 68 thAnnual Technical Conference, Oct.,, 93, Houston, Texas.[3] Brooks, C.S. and Purcell, W. R.(1952).: “Surface Area Measurements on SedimentaryRocks,” Trans. AIME (1952), pp. 289.[4] Carman, P.C.(1938).: “Fluid Flow Through Granular Beds: Trans. Inst. ChemicalEngineers (1938) , Vol.16, pp.168-88.[5] Coates, G.R. and Dumanoir, J.L.(1973).: “A New Approach to Improved Log DerivedPermeability,” Proc., SPWLA Fourteenth Annual Logging Symposium, Lafayette (May6-9, 1973).[6] Morris, R.L. and Biggs, W. P.(1967).: “Using Log Derived Values of Water Saturationand Porosity,” Proc. SPWLA Eighth Annual. Logging Symposium, Denver (June 12-14, 1967) .[7] Purcell, W. R.(1950).: “Interpretation of Capillary Pressure’’ Trans. AIME (1950), pp.369-371.[8] Timur, A. (1968).: “An Investigation of Permeability, Porosity, and Residual WaterSaturation Relationships; Proc., SPWLA Ninth Annual Logging Symposium, NewOrleans (June 23-26, 1968), Paper K.[9] Wyllie, M.R.J. and Rose, W.D. (1950).: “Some Theoretical Considerations Related toQuantitative Evaluation of Physical Characteristics of Reservoir Rocks from ElectricalLog Data,” Trans. AIME (1950), Vol. 189, pp.105-118.
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