The study area is located approximately 120km NE of Alexandria, which lies offshore in the deep water (250-1500m) of the Nile Delta and bordered between latitudes 32º 16` & 32º 06`N and longitudes 30º 44` & 30º 56`E. Simian element is one of the major channel systems that make up the Mid-Pliocene submarine channel complex as mapped in the West Delta Deep marine concession. The materials used in this study include collection and description of the complete log sets from four wells in the study area, including the conventional logs; Gamma Ray (GR), Caliper, Deep and Shallow Laterolog resistivities (LLD, LLS), Micro-Spherically Focused log (MSFL), and porosity tools (Density, Neutron, and Sonic), also the advanced logs; Formation Micro Image (FMI), Combinable Magnetic Resonance (CMR), and Modular Dynamic Tester (MDT). The petrophysical interpretation showed that the effective porosity ranges from 21% to 25% and the water saturation ranges from 29% to 40%, and the volume of shale is from 16% to 29%. Generally, the distribution of the petrophysical parameters increase from the core of the channel toward its levee along the channel axis of the study area. The optimum location for the proposed wells is the southeastern parts of the field, where the lower shale volume and net to gross, and the higher porosity and hydrocarbon saturation values are of the combination of structural amplitude map and petrophysical maps the best drilling for future consideration helped to locate new locations.
GeologicalMapping; Welllogs; Petrophysical Evaluation; Abu Madi Fm; Nidoco Field; Nile Delta Nidoco Field is a large gas field located at the central part of the Nile Delta, along the coast of the Mediterranean Sea. The field stopped production in 2012, due to high water production. Therefore, this work has started to find new opportunities for exploration and production. According to the result of work, new successful wells have been drilled, with huge added reserves in 2015. This work deals mainly with a comprehensive interpretation of the available seismic and well-log data in Nidoco Field. The seismic interpretation was started by generating synthetic seismograms for the studied wells, to link between well-log and seismic data. After good seismic to well tie, detailed seismic interpretation and accordingly geo-seismic cross sections were generated. In addition, complete petrophysical evaluation of the studied wells were studied vertically in the form of litho-saturation cross-plots inferred from the computer processed interpretation (CPI). From these seismic interpretations and petrophysical evaluations, a series of time, velocity, depth, seismic amplitudes, shale content, effective porosity, hydrocarbon saturation and reservoir thickness maps were constructed for the main two reservoirs (Level-2 and Level-3), to have a complete understanding of their geologic properties. The integration of all mentioned data have been allowed the detection of best locations to be drilled and huge gas discoveries have been achieved and production started again from Nidoco Field. Beside that, other new locations are recommended to be drilled, as exploratory and development wells, to produce more hydrocarbons from the study area, which still showing high hydrocarbon potentialities.
An azimuthal seismic study for fault and fracture identification was carried out on a giant onshore carbonate oil reservoir in the U.A.E., Middle East. The seismic reflectivity analysis was performed using advanced independently processed azimuthal sectors from compressional waves. The seismic attributes demonstrated superior capability of defining accurately the detailed reservoir faults and the fracture networks. Although the full azimuthal study achieved excellent results, the azimuthal stacks were observed to sharpen the reservoir subtle structural features. Beside the traditional land seismic data processing, additional challenges were to properly process the seismic data due to the surface topography and the lateral variations in subsurface rock properties. Azimuthal processing successfully demonstrated: Improved fault imaging relative to the available conventionally processed seismic data. Additional information about the seismic anisotropy in the reservoir zones. The analysis showed encouraging results and a relatively good match to known fault/fracture locations. The successful results of the study suggest that high quality 3D wide azimuthal seismic data with relative true amplitude preservation can be used to identify the fracture permeability pathways in carbonate reservoirs. The azimuthal sectors study and results facilitated the quantification of the presence of faults, and suggest that fractured zones can be identified. Another important procedure in this study is the use of the integrated approach during processing and interpretation. Overall, the results of this Azimuthal Study for fractured carbonate reservoir characterization revealed encouraging outputs and valuable guidelines for similar studies in the future.
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