The geophysical approach to interpret reservoir characterization of the Middle Jurassic Shinawari Formation, Upper Indus Basin, Pakistan
Keywords:
Middle Jurassic, Reservior, Diagensis, SeismicAbstract
The Shinawari Formation of Middle Jurassic age is represented by the stratigraphy of mixed carbonate and clastic rocks. The present study attempts to incorporate data from subsurface wells CDW 01 and MW 01 and seismic lines, covering the area of the Upper Indus Basin, Pakistan. In the CDW 01 well, the Shinawari Formation reaches a total thickness of about 71 m, between 4579 and 4650 m. Zone 1, the principal zone of interest, is developed between 4580 and 4635 m, having 39% Ω·m water resistivity (Rw), 4.2% average porosity (PHIE), 58 μs/ft Delta-T (DT) value, and 8% effective porosity. At the CDW 01 well, the reservoir shows approximately 68% water saturation (SWA) and 32% hydrocarbon saturation. While the MW 01 well is characterized by 116 meters of thickness, having a zone of interest designated as zone 1 with 32% average shale value, 49 % Ω·m water resistivity (Rw), 64% average porosity (PHIE), 50.64 μs/ft Delta-T (DT) value, and 20.0 % effective porosity. At the MW 01 well, the reservoir shows approximately 42% water saturation (SWA) and 58% hydrocarbon saturation. Furthermore, depth contour and two-way time (TWT) maps are generated and interpreted from the seismic data. Furthermore, an integrated approach from seismic and well logs (Bulk density vs Neutron porosity cross plot) data portrays that the Middle Jurassic, Shinawari Formation has good potential for the indigenous hydrocarbons and heavy minerals.
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