الفهرس 
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Abstract
hilal and shoab ali oilfields represent two¬separated environmental depositional regime most of the stratigraphic history of the gulf of suez. hilal field represented depocenter basin and shoab ali defined a peripheral one during the suez rift stage. the center of depositional basin in shoab ali area was located southward at sa d3 well. in hilal area, the deepening occurred northward at gs392-¬2 and ez39/-¬3 wells. this phyisographic position of the two fields was reflected on the noticeable variation in response to the gulf of suez rift tectonic activity in both facies and thickness. miocene pliocene evaporites: except for rudeis formation, all the syn rift rock units show evaporate deposits. the complete evaporation process was not encountered in the study area. furthermore, constantly presence of anhydrite instead of gypsum may be as a result of dehydration of the gypsum into anhydrite. the unique resemble between hilal and shoab ali evaporites occurred in the ghara anhydrite, markha member and upper south gharib unit. ultimate stage of evaporation process was recorded during deposition of zeit formation as k salts were deposited. generally, the restriction increases and consequently the thickness from north to south. however, pliocene recent deposits show increase restriction from south to north as a new connection with indian ocean has occurred. the evaporites environment varies from rock unit to another. it was mainly marine environment during deposition of ghara and markha members changed to subaqueous shallow marine condition during baba and feiran members. more restriction conditions were dominated during deposition of south gharib and zeit formations as consequence of barrier structure located at the northern gulf of suez. structural settings: forty¬three seismic profiles shot in different directions were selected to identify the structural settings of the study area. interpretation of these lines indicated that the study area consists of alternative horst and graben structures. hilal field is a horst structure capped by salt diapir and shoab ali field is also horst structure overlain by salt pillow. the area between the two fields is dominated by a graben. the horst structure of hilal field is about 3 by 1km while shoab ali horst structure is about 5 by 1. 5 km. the limit between depocenter facies and peripheral one can be detected on the seismic profiles indicating about 3. 5 km long from the center of the depocenter basin. petrophysical characteristic of the nubia sandstone reservoir: a comprehensive petrophysical evaluation of the nubia sandstone reservoir required determination of its static and dynamic characters. matrix identification was made through applying the traditional graphical crossplots and analytical technique using the inverse matrix algebra. this technique was applied using excel program to overcome the shortcoming of the traditional graphical crossplots. the main advantage of this technique is maintaining the depth information. it also provides the values of the effective porosity.