الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The present thesis dealt with studying of the subsurface geology and evaluation of the hydrocarbon potentialities of the Late Pliocene<U+2013>Early Pleistocene ElWastani Formation using borehole information and well log data of eight wells distributed in the Rosetta Gas field, offshore Nile Delta, Egypt. This is achieved through analysis and interpretation of the available subsurface geological data and wireline logs for detecting the lateral as well as the vertical variation of both reservoir and nonreservoir facies. The petrophysical analysis of ElWastani Formation was determined utilizing a complete set of wireline logs including Resistivity, density, neutron, and natural gamma ray and caliper logs. The analogue well logging data are converted to digital format, for integration and analysis using computerbased geoinformation mapping and modeling system in order to identify likely hydrocarbon reserves targets. The digital database resides on one computer and termed the master petrophysical database. The petrophysical software used is (Rb(BELANplus, giving a great flexibility in the way of data handling. For this software provides a highquality reliable system and allows fast and accurate analysis. The petrophysical work as an integral part of a full subsurface study is integrated with other geoscience related studies for an optimum characterization of the reservoir properties. Such comprehensive studies integrated geology, petrophysics, build appropriate reservoir models, recommend new well locations, aerial fluid movement prediction, mature field reviews to identify additional reserves, and assess and reduce uncertainties in reservoir modeling. Finally, two lease maps has been constructed, integrating the well logging deduced petrophysical, saturation parameters and the lithological data of the ?C? and ?D? sands of ElWastani Formation. These maps point to promising new sites for future drilling. The porosity and water saturation interpretation module of the ELAN software is used to calculate the total or effective porosity the water saturation of the uninvaded zone, the flushed zone water saturation, the matrix density and the clay volume. The interpretation problem of water saturation determination in shaly formation lacks a satisfactory solution. A wide variety of Sw models currently are used routinely to evaluate shaly sands. Each model can provide a significantly different Sw. A true solution to the shaly sand problem requires a sound scientific theory yielding a Sw model capable of universally consistent predictive performance.