Carbonate rock properties relationships to cementation factor in the mishrif formation

Abstract

The cementation factor (m) has specific effects on petrophysical properties in porous media. The accurate determination of cementation factor (m) gives reliable saturation results and consequently hydrocarbon reserve calculations. NS oil field is the studied field, which is one of the giant oil fields in the Middle East.NS-1, NS-2, NS-3, NS-4 and NS-5 are the studied wells, the study made across the Mishrif carbonate formation (1929m-21 00m). The Neuralog software V2008, 5 was used to digitize the scanned copies of available logs, while the Origin pro8 program was used to find relations. Environmental corrections had been made as per SLB charts 2005.Permeability, compressional wave velocity, shear wave velocity, total porosity and cementation factor had been calculated. In this study porosity, permeability and acoustic velocity relationships to cementation factor (m) are proposed. A comparison was made for the studied properties deduced from laboratory core analysis and from the available well logs. The statistical relations showed that correlation coefficients (R2) have ranged between weak and good. The value of this study should provide useful relations to the log analyst.