الفهرس 
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Abstract
The study deals with the lithostratigraphy, microfacies, mineralogy, diagenesis, petrophysics and reservoir quality of Matulla Formation (Coniacian- Santonian) located in the eastern part of the Gulf of Suez and western side of Sinai, bordered by latitudes 28° 35’ and 29° 40’ N and longitudes 32° 50’ and 33° 15’ E. Three stratigraphic surface sections (Wadi Sudr, Wadi Matulla and Gabal Nezzazat) were sampled, described and measured in detail. These surface sections and well log data of well (BM-85) in Balayim oil field are used to identify the reservoir characteristics of Matulla Formation. To achieve this goal, petrographic examination was undertaken on a total of one hundred and forty blue dyed resin thin sections from Matulla Formation to describe precisely the microfacies associations, mineralogical and diagenetic aspects.
The results of the study area reveal the Matulla Formation are mostly clastic (quartz arenite, quartz wacke, claystone and shale) and nonclatic (lime-mudstone, bivalva floatstone, oyster rudstone, bioclastic grainstone, oolitic grainstone, bioclastic peloidal grainstone, bioclastic packstone, bioclastic wackstone, bioclastic dolostone, glauconitic dolostone and oolitic ironstone). Scanning electron microscope (SEM) was carried out for forty six rock samples representing different type to identify pore structure and authigenic minerals. Porosity types are dominated by primary interparticle forms, as well as accessory intraparticle types. Local occurrences of mm-sized vuggy, fractured and mouldic pores following carbonate dissolution greatly enhance the petrophysical properties of many studied sandstones.