Identification of petrophiscal reservoir water saturation properties using the comparison of capillary model and log model

Abstract

The study of the physical properties of reservoir rocks and knowledge related accounts of great importance , As it relates to understanding the behavior of the fluid now inside the circles with respect to porosity' and size of the reserve accounts and assess the classes before the start of development processes. This study addresses some of the physical properties of the rocks and in particular those that can be used in determining the oil water contact Determining the oil-water contact is very important in the assessment phase and class in determining the area of contact between the oil and the water and see the transition zone. The study shows the estimation process of oil-water contact (OWC) and give best understanding of the capillary behavior of hydrocarbon reservoirs that are vital for optimum reservoir characterization. Hence, the height of oil-water contact above free water level for different rock types from some Sudanese field reservoirs were estimated. The Data obtained from oil-displacing brine (drainage) capillary pressure tests using refined oil as simulated brine formation or reservoir fluid on various rock samples were utilized to illustrate the basic capillary behavior often hydrocarbon reservoirs and to estimate the (OWC) above Free Water Level. The study shows that all the samples taken from bentiu formation show high permeability and well sorted grains which is indicative of good reservoirs this is further confirmed a depth range of 2998.5 to 3050 m which indicate good quality reservoirs. Calculation result of the capillary model indicate that the oil water contact value at (3018m) (9899.04 ft) and from well logging at (3020.4m) (1050.912 ft)