الفهرس 
INTRODUCTION AND GEOLOGIC SETTINGOnly 14 pages are availabe for public view
Abstract
Port Fouad Marine Gas Field lies in the Northwestern Mediterranean section of the offshore Sinai at the North Port Said Concession of the IEOC, approximately 35 Km northeast of Port Said. The present work deals with the study of Port Fouad Marine Gas Field, east of Nile Delta cone, Egypt, in terms of the structural setting, petrophysical evaluation, sequence stratigraphic analysis and erosional features of the Miocene-Pleistocene succession in the area.
Sequence stratigraphic analysis is performed using the available seismic sections and well logging data of PFM-2, PFM-3, PFM-Deep-2R and PFM-SE-1 wells. The analysis results in the recognition of fifteen 3rd order sequences and fourteen maximum flooding surfaces through the Miocene-Pleistocene succession. The resulted Tortonian 1 third order sequence is divided into two fourth order cycles which are Tor 1-1 and Tor 1-2. Lowstand systems tracts are recognized within nine of these third order sequences and the two fourth order sequences. The interpreted Miocene-Pleistocene sequences are then correlated well with those of Boukhary et al. (2015).
Seismic facies analysis is made to describe the channel feature at Tor 1-1 fourth order cycle at the western part of the study area in addition to the channel fill at the central eastern part within Tor 1-1 and Tor 1-2 cycles that is maybe considered as potential hydrocarbon reservoirs. Moreover, several isochore maps are constructed for the low stand systems tracts within selected sequences, thus the northern, southern and southeastern parts of the study area are mostly considered as areas of potential hydrocarbon importance due to the high thickness values of the lowstand systems tracts of Tor 1-1, Tor 1-2, Za 2, Pia 1 and Gel 1 sequences.
Seismic velocity analysis is carried out to construct a number of average velocity, interval velocity and reflection coefficient contour maps for Sidi Salim, Wakar, Rosetta, Kafr El Sheikh and El Wastani Formations. Time, depth and velocity curves are plotted for PFM-1, PFM-2, PFM-3, PFM-Deep-2R and PFM-SE-1 wells, thus a gradual increase in average and interval velocities values with depth is revealed due to the increase of compaction with depth. High interval velocity values are recorded within Rosetta Formation due to the salt and anhydrite lithological composition.
A detailed seismic structural analysis is performed to construct several geo-seismic sections and structural depth maps on tops of Sidi Salim, Wakar, Rosetta, Kafr El Sheikh and El Wastani Formations. The Integration between these maps and the interpreted seismic sections is performed to define the structural setting in the area.
The detected northwest oriented faults affecting the Miocene-Pleistocene rocks in the study area, can be classified into three fault systems, which are the Miocene affecting faults, Pliocene-Pleistocene affecting growth normal faults, and the Miocene-Pleistocene affecting faults. Some of these normal faults cut through the Miocene formations only, whereas the other extends upward through the Pliocene-Pleistocene formations. A set of growth normal faults are found dissecting only in the Pliocene-Pleistocene sediments. Some of these growth faults are accompanied by rollover anticlines at their hangingwalls and salt rollers at the base of their footwalls.
Upper Miocene Wakar Formation shows a distinguished southward increasing in thickness (Land-direction), whereas the Pliocene-Pleistocene formations (Kafr El Sheikh, El Wastani and Mit Ghamr Formations) show a northward thickness increase (continental slope direction). The erosional truncation at the base of the upper Miocene Rosetta Formation, channel cross section within upper Wakar Formation, onlap-fills, downlap and erosional processes and related southward increasing in thickness (Land-direction) of the upper Miocene Wakar Formation allows us to recognize a Messinian canyon (Bardawil canyon) in the study area. The Bardawil canyon has a curved trunk during the erosion of the Wakar Formation (Tortonian-Early Messenian) and ended by the development of several small streams before the deposition of the Rosetta evaporites. Geometry of both trunk and streams attributed that the sediments supply was from the exposed land lying in the south. Bardawil canyon development is a result of a late Messinian tectonic uplifting in the eastern part of the Nile Delta cone, just after the deposition of the Wakar Formation (Tortonian-Early Messinian).
Well logging and petrophysical evaluation are carried out using the digital well logging data of PFM-1, PFM-2, PFM-3, PFM-DEEP-2R and PFM-SE-1 wells. This analysis results in detailed interpretation of the recorded log measurements and estimation of the hydrocarbon related petrophysical properties of the Late and the Middle Miocene rock units which are represented by Wakar and Sidi Salim Formations. These properties include the effective porosity, water saturation and gas saturation.
Five neutron-density and five M-N crossplots are constructed to confirm the main lithology of the Wakar and Sidi Salim Formations in all studied wells which is revealed to be dominant calcareous shale with calcareous sandstone interbeds.
The appropriate effective porosity, shale volume and water saturation cut-offs are applied in the analysis to determine the thickness of the net reservoir and the net pay zones in Wakar and Sidi Salim Formations in the studied wells. The resulted net pay thickness in all the studied wells ranges from 1.5 m to 16 m in Wakar Formation and 1.5 m to 11.5 m in Sidi Salim Formation.
The petrophysical evaluation of Wakar and Sidi Salim Formations in all the studied wells results in the construction of five litho-saturation crossplots which include the measured output hydrocarbon related petrophysical parameters in both studied formations. Depending on the evaluation results, it is recommended to consider the detected Wakar Formation net pay zones in PFM-3 and PFM-DEEP-2R wells as potential economically productive gas zones due to the resulted good effective porosity, very high gas saturation and low water saturation levels in these zones. On the other hand, the revealed net pay zone of Sidi Salim Formation in PFM-SE-1 well can be considered as the best potential gas productive zone within the formation’s net pay zones because it has the greatest thickness, the lowest water saturation and the highest gas saturation among them.