フラクチャー型の低浸透率石灰岩貯留層におけるNMR検層の活用例
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We evaluated fracture, permeability, porosity and water saturation of fractured low permeability limestone reservoir in the Gulf of Suez, Egypt. We explain the example of applied methods and problems associated with evaluation of the reservoir. It is necessary to understand the characteristics of each logging tool to estimate the reservoir properties appropriately.The subject of this study is an oil field located in northern part of the central Gulf of Suez. The main reservoir in the field is composed of carbonates which are Thebes and Mokattam Limestone of Eocene. In case of carbonate reservoir, empirical methods established for sandstone reservoirs sometimes couldn't be applied due to considerable variations in rock properties including pore geometry. Special wireline logging tool such as NMR, borehole imager, sonic scanner and core analysis are essential for evaluation of carbonate reservoirs, especially in evaluating the fractured reservoir of low matrix permeability.In this study, we estimated open fractures using coherence of shear-wave and anisotropy of shear-wave slowness on dipole source sonic, while all fractures are observed as resistive fractures in the well because open fractures are filled with oil-base-mud. Matrix permeability was calculated by NMR log and calibrated by core analysis. It is possible that each values of NMR permeability in other wells can estimate without NMR log from effective porosity by Neutron-Density logs. We estimated tar volume from wireline log data and core analysis results. The presence of the residual tar in the rock became an obstacle for the conventional interpretation of the reservoir properties. The electrical properties were measured again after sufficient cleaning of the core plugs. As a result, the values of formation resistivity factor and formation resistivity index decreased. Consequently, the Archie parameters determined from the results of the electrical properties after sufficient cleaning were used in SW calculation.
- 石油技術協会の論文
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