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3D Imaging of the Pore Network in the Shuaiba Reservoir, Al Shaheen FieldNormal access

Authors: T. Solling, X. Marquez, S. Finlay, N. Bounoua, T. Gagigi, T. McKay and A. Fogden
Event name: IPTC 2014: International Petroleum Technology Conference
Session: Session 16: E&P GEOSCIENCE - Seismic Characterisation of Fractures and Permeability
Publication date: 19 January 2014
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.99Mb )
Price: € 20

Summary:
ment and simulation of flow properties. As a complement to parallel studies of the plugs by conventional petrographic and core analysis techniques, a set of samples from four wells in the Shuaiba reservoir of the Al Shaheen field was analysed by 2D mineral mapping (from QEMSCAN) of polished plug sections, and by 3D tomographic mapping (from micro-CT) of subsampled mini-plugs, as a complement to parallel studies of the plugs by conventional petrographic and core analysis techniques. QEMSCAN showed a high variability in measured porosity and pyrite content over all sampled length scales, from millimetres (across the polished plug faces) to feet (with depth in a given well) to kilometres (across the four wells). The porosity from QEMSCAN was generally found to be in good agreement with that measured on the conventional plugs. Two mini-plugs of 5 mm diameter were scanned using helical micro-CT, one of which was subsequently analysed to segment the macropores, microporosity, calcite and pyrite. Comparison with the QEMSCAN results from the section of the “parent” plug showed consistency in estimated porosity and pyrite content between the two methods. Simulations of conductivity and absolute permeability were performed on subvolumes of the segmented tomogram, and displayed a strong variability with the location and size of the chosen subvolume, although the overall trends remained in good agreement with core analysis.


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