الفهرس 
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Abstract
Nile Delta region has a relatively complex geological history, marked by repeated episodes of tectonic uplift and subsidence due to its position on the active northern margin of the African Plate. As part of the Nile Delta, the area of study (Port Fouad Marine Field) is located in the eastern sub-basin at the Northeastern off-shore part of the Nile Delta of Egypt, about 60 km North of Port Said town. The area covers almost 123 km2, it lies in a water depths range of 22.5-28 m. The geological knowledge of the Nile Delta is still somewhat limited, as the area does not have any exposures of ancient rocks since it is covered by Holocene soils. The area of study suffered from a complex geological history during Mesozoic. It was affected by rifting in north-west to south-east direction that led to the formation of listric fault planes and tilted fault blocks.
The hydrocarbon potential of the Nile Delta sedimentary sequence is, for the time being, limited to the Pliocene-Pleistocene formations, due to complex geologic setting and poor seismic imaging of older formations. Lately, the discovery of commercial hydrocarbon accumulations in the Miocene interval encourages some exploration companies to drill wells reaching this interval. Therefore the purpose of this work is to study the petroleum system elements and processes to detect the potentiality of the studied area by integrating different types of data such as seismic, pressure data, geochemical data and well logs.
Studying the petroleum system of the area was challenging due to lake of seismic data and existence of bad seismic data imaging (i.e., mud volcano, tuning thickness, Messinian complexity and low signal to noise ratio). Only four wells penetrated the Tortonian section distributed all over the area. The lack of penetrations in the area made the understanding of the reservoir continuity difficult for this area. Only one well contains geochemical data which made the understanding of the source rock properties (thermal maturity, organic content, etc.) very difficult.
The present work concerns with; Understanding the tectonic setting and structural development of the study area. Evaluating the petrophysical properties of middle Miocene interval (Wakar Formation) based on the available geophysical logs, studying the pay zones continuity and variety of the fluids within the different pay zones, finally, evaluating the source rock properties and integrating the whole results to create a 1D basin model for the study area and a representative petroleum system chart.
This study reveals the presence of multi gas-bearing sand zones in Wakar S1 level and Sidi Salim Formation, with good hydrocarbon potential, encountered at different depth levels. The detailed petrophysical analysis of these zones show that S1 level attain good reservoir parameters in all wells, however its dryness in PFM S-1 well, while S2 and S3 levels are either shaled out or water bearing in the study area. However, Wakar S1 level exhibits unique characteristics; in terms of the good porosity (18 to 30%), low shale volume (Vsh<10%) and high gas potentiality (40 to 92%), which it attains. The reason behind the dryness of PFM S-1 well may be due to its existence at the hanging wall of the major listric fault which dips towards NE direction. The accumulation of hydrocarbon increases towards NE (basin-ward) due to presence of rollover anticlines that formed at the foot wall of the listric fault.
The analysis of pressure data is concerned mainly with locating the different fluid contacts, determining the pressure gradients of the gas-bearing zones, and detecting the different hydrocarbon densities. Pressure gradient ranges of 0.091 to 0.325 psi/ft are indicated for Wakar S1 level, which reveal the presence of dry gas and condensate. The analysis also confirmed the vertical discontinuity of the separated pay zones, where the shale lamina between the pay sand zones act as a vertical barrier for the vertical fluid flow. Due to the lake of wells and a far distance between the wells, the study of the reservoir horizontal continuity was impossible.
The analysis of geochemical data reveals that both Wakar and Sidi Salim formations are immature fair potential source rocks with poor generating capability throughout the area of study. The reason behind the economic accumulation of hydrocarbon in the reservoirs is the biogenic activities that lead to generation of dry gas that flowed through the different reservoirs. There is no any evidence for existence of any thermo-genic hydrocarbon activities at the area of study.