ABSTRACT:

Exploration in the Nile Delta for the Pre-Tortonian section was very limited in the past. So, the current evolution of hydrocarbon discoveries encouraged geologists to intensively through light on the deeper reservoirs allover the sedimentary sequence in the Nile Delta The study aimed to construct a regional structural and Stratigraphic setting for the deeper horizons to verify the role of the fault pattern on hydrocarbon migration and entrapment, the reservoir characteristics and their hydrocarbon classifications. Such few and scattered discoveries like well Mango-1 (Offshore Cretaceous), Tineh-1 (Offshore-Oligocene), Qantara-1 (Onshore, Qantara Fm.), Faurouz-1 (Onshore-Qantara Fm.) Raven-1&2 (Offshore-Qantara Fm.), Saphire deep-1 (Offshore-Oligo-Miocene), Tamad-1 & 2 and Turbay-1 (Onshore-Sidi Salem Fm.) provided essential information on the Tertiary stratigraphy indicating the occurrence of thick basins of potential mature source rock. A great integration between geological and geophysical data revealed many deeper discoveries. These discoveries are attributed mainly to the nature and timing of the deep - seated structures, hydrocarbon expulsion, migration and entrapment. Also, the Exploration in the Nile Delta for the Pre-Tortonian section was very limited in the past. So, the current evolution of hydrocarbon discoveries encouraged geologists to light oil discoveries in Oligocene and older sediments are related to organic sediments with hydrogen-rich kerogen type (as source rock), compress ional and extensional deformations. While, thermogenic gas and condensate in the younger Miocene sediments are related to extensional fault system Due to the slow sealing efficiency (faults or rock beds), leakage of gas-cap was responsible for leaving light oil in the deeper horizons

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