الفهرس 
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Abstract
The present work was devoted to evaluate the reservoir characteristics of the Abu Roash Formation in the vicinity of El-Razzak Oil Field, North Western Desert, Egypt. The area of study is bounded by latitudes 30 25’ and 30 55’ N and longitudes 27 50’ and 28 40’ E .Nine distributed wells (IG30-1, IJ30-1, IG33-1, IH35-2, IG34-1, IF32-1 IF34-2, IE34-6 and IE36-1) were utilized for this study Such a work was conducted through several stages, started by reviewing the geologic setting of the study area through the previous geologic works and literature’s to shed lights on the surface geology subsurface stratigraphy, geomorphology, structures, tectonics and geologic history This study depends on different types of open-hole well-logs such as resistivity (shallow and deep), porosity tools (neutron, density and sonic and gamma-ray, to determine the petrophysical parameters and their
reflections on the reservoir performance. The analytical well logging system followed in this evaluation was began by correcting the logging data of the chosen boreholes through the corerection of fluid and rock resistivity by the determination of the formation temperature. Also, the porosity tools were reduced throuth the bulk density and neutron porosity corrections A new technique has been applied through Pickett’s plot, to develop some of reservoir petrophysical parameters. These parameters include capillary pressure, pore throat aperture radii, height above the free water table and bulk volume of water. This technique depends on the use of loglog plots of effective porosity versus resistivity combined with empirical v ABSTRACT relationships for calculating the capillary pressure expressed as a function of permeability, porosity and water saturation. Also, this technique gave the values of petrophysical exponents (m, n and a) which were used to calculate the accurate value of water saturation in both clean and shaly rocks and then adjusted estimation of hydrocarbon saturation. The integration of these petrophysical parameters on a log-log graph of porosity versus resistivity gives the importance for pickett plot to be used in reservoir interpretation The petrophysical parameters (Фe, Vsh, Sw, Swir, Sh, Shr and Shm were calculated and represented horizontally in the form of isoparametric maps to illustrate their areal distribution within the evaluated