الفهرس 
Scope of the Present StudyOnly 14 pages are availabe for public view
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Abstract
The Gulf of Suez is considered as one of the most productive provinces in
Egypt, which contains a lot of reservoirs that ranges in age from Pre-Cambrian to
Quaternary and the present study focus on the petroleum potentiality of Cretaceous
reservoirs in the Central Gulf of Suez. The area of study extended in latitude from
22° 34’ 41’’ N to 22° 34’ 48’’ N and in longitude from 25° 01’ 39’’ E to 25° 01’ 48’’ E.
The present work is denoted for Cretaceous Nubia Formation in October Oil
Field, Central part of Gulf of Suez, Egypt to give the tectonic and stratigraphic
framework description via Seismic study to clarify structural and stratigraphic
complexity using seismic pattern, seismic attributes, seismic maps, cross section
analysis in which to help in distribution of extra development and production wells
that can aim the productivity and profitability with integration of well log analysis
and subsurface geology of the study area estimating different petrophysical
parameters and hydrocarbon potentialities of Nubia Formation through four wells
(OCT-A1ST1, OCT-A2B, OCT-B2, OCT-H3). The available data include 2D 20
Seismic lines, log data includes the Shale volume tool(Gamma Ray), Resistivity
tools(shallow and deep devices), porosity tools(Sonic, Density and Neutron logs),
Mechanical tool(Caliper log) plus wells X, Y, Stratigraphic sequences of Formation
Evaluation logs, Directional surveys.
Nubia Sandstone is considered as the zone of interest and the main producing
rock unit in Paleozoic-Cretaceous age. Its average thickness in main area is 2300
feet and is classified as medium-grained, moderately to well sorted quartz arenites.
Quartz and kaolinite are the main authigenic cements, with dolomite and calcite
locally present, particularly in the Transitional Nubia unit. medium-grained,
moderately to well sorted quartz, improvement up-section in textural, compositional maturity and increase in lateral continuity of bedding represents continental fluvial.
Sudr formation of Cretaceous age supply Nubia sandstone as source rock that expect
started generating oil in Miocene. Nubia reservoirs are top sealed by overlying
Cretaceous shales of the Raha Formation and sealed laterally by downthrown
Miocene shales of the Lower Rudeis Formation. The ultimate seal is provided by the
overlying Miocene evaporites of the South Gharib and Zeit formations. The seismic
studies of the area including structural and stratigraphic complexity analysis with
structural maps, cross sections, seismic patterns and attributes show that Nubia
Sandstone reservoir is fault-bounded to the SW and south, and is dip with fault
extends up into the post-Zeit sediments, that mean trap was probably not established
until the Pliocene. The well log analysis of available data that including distribution
& isometric maps (shale volume, porosity, permeability, hydrocarbon maps) show
that the Nubia Sandstone temperature around ± 230°F and is considered as a clean
reservoir in most of wells (average volume of shale 6-7%) with average effective
porosity up to 15-17%.
The formation water resistivity at reservoir temperature ranges from 0.02-0.03
ohm.m. The effective water saturation ranges from 23-65% and hydrocarbon
saturation from 35-97%. The permeability ranges from 50-392 mD.