الفهرس 
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Abstract
The thesis is focused on the reservoir characterization of the El-Tamad Field that is producing oil and condensates from the Messinian Qawasim Formation. The thesis includes also stratigraphic and structural settings of the El-Tamad Field as well as detailed sedimentological studies on the Qawasim Formation which is mainly sandstones with limestones and shales interbeds. Petrographically the sandstones are mainly sub-arkose or sub- feldspathic arenites with dolomitic sub- arkosic arenites. The geochemical analyses show that both Qawasim and Kafr El-Sheikh formations are oxidized, poor and immature and are not the source for the hydrocarbons in the El-Tamad Field wells. The Biomarker investigations reveal that the El-Tamad hydrocarbons have been generated from Lower Tertiary terrestrial source rocks deposited under oxic conditions, expulsed at the early phase of oil generation, migrated through faults and trapped in the upper part of the Qawasim sandstone reservoir. The Qawasim interval penetrated in the El-Tamad Field wells has been subdivided into five levels with different petrophysical properties. The first two levels are productive and considered the pay zones in all wells. The other three levels have reservoir characteristics but they are not productive.