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Abstract The present work deals with the graphical well logging analysis for five wells (East Esh El-Mellaha-2, West Hurghada -1, Abu Shaar NE-1, Abu Nigar-A and Abu Nigar-C) distributed in the southern part of the western coast of the Gulf of Suez. The East Esh El-Mellaha-2 and West Hurghada-1 wells are located on-land, while the other wells are located in the Gulf offshore area. Such an evaluation is carried out on two formations (Kareem and Rudeis) selected in the Gulf of Suez sequence. The Kareem and Rudeis Formations are very important in the petroleum exploration of this part of the country. Moreover, the lithologic constitution of Kareem Formation is predominately shaly, but with frequent intervals of sandstones. The Rudeis Formation has a considerable thickness allover the Gulf of Suez and is essentially composed of highly fossiliferous shales and marls, referred to as the Globigerina marls and sandstone. Shales of the Rudeis and Kareem Formations are considered by some authors to be the main source rocks of the Gulf area. The available data used in the formation evaluation of the two fore-mentioned rock units are in the form of resistivity logs (micro-spherically focused log and dual laterolog), porosity tools (sonic, density and neutron) and gamma-ray logs. Also, two seismic lines are added to delineate the structural regime of this area. Graphical well logging analysis has been followed as the main technique of the formation evaluation. Graphical well logging analysis includes, mono-porosity crossplots, dia-porosity cross plots and tri-porosity cross plots. Mono-porosity crossplots are applied between the resistivity logs (deep and shallow resistivities) and the porosity tools (sonic, density and neutron) to determine the formation water resistivity (Rw), the water saturation (Sw), the flushed zone saturation (Sxo), the matrix parameters ( ?ma, Atma and ONma) and the total porosities (OT, OD and ON). Moreover, the frequency plots of the fore-mentioned basic data are used for concluding the prevailing geo-logging conditions during the logging operation and also for checking the values of water resistivities and saturations. The dia-porosity cross plots are constructed between the porosity tools (pb, At and aN) and the porosities derived from logs. Eight relations are established to determine the volumes of shale and the effective porosities. |