الفهرس 
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Abstract
The study area lies in the north Western Desert between longitudes 27o 39’ to 28o 36’ E and latitudes 29o 42’ and 30o 03’ N. It comprises the BED 3 and Sitra development leases which occupy the central part of the most prolific basin in the Western Desert, Abu Gharadig Basin. The objectives of the current study are to understand and evaluate the petroleum system elements and processes that controlling the hydrocarbon potentialities of the study area (BED 3 and Sitra) with special emphasis to the Cretaceous sequence, compare between the main prospects in the area of study and evaluate these prospects and explain why some definite reservoirs are successful as prospect while others not. The Albian–Cenomanian Kharita Formation was deposited in a high energy shallow marine shelf and considered as the main pay zone in the BED 3 oilfield. On the other hand, Kharita sands are dry in the Sitra 8 Field. Also, the shallow marine shale, sandstone, limestone and dolomite interbeds of the Abu Roash “G” Member is another hydrocarbon bearing strata. The Abu Roash “G” reservoir is considered as the main pay zone in Sitra field, while the same reservoir in BED 3 is dry zone. The most consistent and widespread source rocks have been found in the Upper Cretaceous Abu Roash Formation (units ”E”, ”F”, and ”G”). Fair to good oil source rocks are present in most parts of the Western Desert especially Abu Gharadig Basin. The Abu Roash “F” Member is the best documented source rock in the Abu Gharadig Basin with TOC values of 1.5-2.5% to 6% in the central basin and with oil/gas prone (Type II-III kerogen) character. Based on the analysis of geochemistry reports for the available wells in the study area, the source rock is proven and mature and able to generate mixed hydrocarbons (Type II-III kerogen). Sealing mechanisms were applied in the current study to explain why definite reservoirs have hydrocarbons while others not. Allan’s juxtaposition diagram for the main faults in the study area shows that Kharita sands in BED 3 area have excellent juxtaposition as Kharita juxtapose to upper Bahariya and intra Bahariya, which is composed mainly of shale and limestone. Abu Roash “G” sands in BED 3 area have bad juxtaposition as the Abu Roash “G” juxtapose to Abu Roash “C” sand (sand juxtapose sand). Allan’s diagram shows that the Abu Roash “G” reservoir (main target) in Sitra 8 is juxtaposing Abu Roash “D” which is composed of limestone and shale acts as a very good seal rock. The Kharita reservoir is juxtaposing Abu Roash “G” sand (sand juxtapose sand) from the crest position which can explain the bad juxtaposition.