الفهرس 
WELL LOG DATA CORRECTIONSOnly 14 pages are availabe for public view
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Abstract
The objective of the present logging study is the lithofacies analysis of the Miocene clastic rock
units in Ras Ghara area, Gulf of Suez, Egypt. The area of study is located in the southern part of
the Gulf of Suez, where the western dip regime is dominant. Such an analysis was carried out on two
formations (Kareem and Rudeis) selected in the Miocene sequence. Ten wells (Sinai-1, Sinai-2,
Sinai-3, Sinai-4, GM-Aief-1, GM-Dal-1, GM-Dal-2, GM Geem-1, GM-Haa-1 and GM-4) were utilized for
accomplishing this assessment. Such a study is performed using the different types of open-hole
well logs, such as : Neutron, Density, Sonic, Gamma Ray, Natural Gamma-Ray Spectroscopy,
Litho-Density Tool and Resistivity for the determination of the included petrophysical parameters.
Such a work is conducted through several stages, started by reviewing the geologic setting of the
study area through the previous geologic works and literatures, to shed lights on the subsurface
stratigraphy, paleogeography, structures, tectonics, geologic history and previous exploration
activities.
from these wells, the study of the mineralogic composition of these rock units is needed. This is
done through the crossplots technique to detect the rocks forming minerals such as silicates
(quartz and potash feldspars), clay minerals (montmorillonite, illite, kaolinite and glauconite), carbonates (calcite and dolomite) and
evaporites (anhydrite). For Kareem Formation, the following
minerals are indicated : quartz, calcite, montmorillonite, illite, Kfeldspar
and anhydrite. For Rudeis Formation they are : quartz,
calcite, dolomite, illite, montmorillonite, K-feldspar, kaolinite and
glauconite. These mineral constituents are represented, zonewise,
in the form of litho-porosity crossplots to show their vertical
distribution within each well. The spatial distribution of the rocks
forming minerals are represented by the iso-parametric maps to
illustrate their lateral changes for both Kareem and Rudeis
Formations across the study area.
The use of wireline logging tools has been widely practiced
to evaluate the matrix constituents, beside the pore volume
through sonic, density and neutron tools. The methodology is
easily coded as graphical techniques (M-N crossplot and Ternary
diagram), in which whose outputs are mineralogic and/or porosity
contents. A modified technique has been proposed for judging and
controlling the lithofacies constituents, that deduced from the
porosity logs (<pN, Pb and ~T).
Three lithologic components have been deduced. These are residual chert with carbonate, carbonate with residual chert and
shaly carbonate. A number of lithofacies maps were constructed
for the Kareem and Rudeis Formations. The more realistic picture
deduced for the lithofacies conditions of the evaluated rock units in
the considered area shows their wide range of depositional
environments. Accordingly, the Kareem Formation reveals more
continental affinity in the form of fluvio-marine to shallow marine
conditions, while the Rudeis Formation reflects more maritime
affinity in the form of shallow to deep marine conditions, with the
heavier hydrothermal flux and more cyclic sedimentation for the
latter rock unit.
Moreover, the maximum average and minimum values for the effective porosity, water saturation,
irreducible water saturation, saturated hydrocarbons and permeability were defined to delineate the
effect of the implied minerals on the reservoir quality. Regarding the reservoir performance of
the studied formations, the Kareem Formation reflects a poor to fair reservoir quality, because its
mineral association (quartz, K-feldspar, montmorillonite, illite, calcite and anhydrite) plays a
prominent part in the definition of the reservoir capabilities. In Rudeis Formation, the mineral
content (quartz, K-feldspar, montmorillonite, illite, kaolinite, glauconite, calcite and dolomite)
reflects fair to good reservoir quality.