Petrophysical evaluation and hydrocarbon potentiality of the Kareem sand reservoir at GS277 oil field, Gulf of Suez, Egypt

Abstract

Kareem Formation is one of the Gulf of Suez's most significant hydrocarbon resources. It makes asubstantial contribution to Egypt's overall oil production especially in Morgan and Badri fields.Kareem sand reservoir is deposited as a fan-delta environment, which erodes the high rift shouldersand deposits in the Basin. The present work deals with the petrophysical evaluation of Kareem SandReservoir at GS277 Oil Field which is the only oil reservoir in the field. Comprehensive well loganalyses techniques were applied for a three-selected well in GS277 oil field. Those wells are namedGS277-1, GS277-A4 and GS277-A5. The minimum suite of logs consisted of gamma ray, density,neutron, and resistivity logs; all the log data are in the form of LAS files. Specialized software wasused for the petrophysical evaluation of Kareem sand reservoir in this study. In this paper , theessential petrophysical parameters were evaluated such as volume of shale (Vsh), effective porosity(Øeff) and water saturation (Sw). Also, cross plotting techniques are used for water resistivity (Rw)calculation and lithological identification for Kareem reservoir in the study area. The derivedparameters from the petrophysical evaluation were used to calculate the standard tank oil in place(STOIIP) in Kareem sand reservoir in the study area. From the outputs of the petrophysicalevaluation, it was found that Kareem Formation is a good reservoir rock in most intervals, where theinterpretation of the well logging data indicates that the porosity ranges from 16% to 20% , shalecontent ranges between 5% to about 7%, water saturation from 20% to about 30%, and Net paythickness ranges between 20 ft to about 50ft. The analysis of Lithological Identification cross plotfor Kareem Sand reservoir indicates the presence of mixed lithology composed of sandstone andlimestone. Petrophysical Analysis for Kareem Sand Reservoir in GS277 field indicate anenhancement for the reservoir properties towards GS277-A4 and GS277-A5 wells which may behighlight an opportunity for drilling a development well to maximize oil recovery from the field.Standard Tank oil in place (STOIIP) for Kareem sand in GS277 Field is calculated depending on thederived petrophysical parameters. The STOIIP ranged from 15 to 20 MMBO which highlighted ahuge amount of hydrocarbons that is under developed.