Title : Reservoir potential, net pay zone and 3d modeling of cretaceous pab formation in Eastern Suleiman Range, Pakistan
Abstract:
Eastern Suleiman Fold and Thrust Belt comprise of a thick cover of sedimentary sequences. Complete petroleum system-source, reservoir and seal rocks-are present in these sequences. An integrated approach is adopted to delineate reservoir potential and net pay zones in the clastic reservoirs of the Cretaceous age widely distributed in the area. Wireline logs and migrated seismic reflection data were used for field development and optimization. Petrophysical analysis reveals that Pab Sandstone of the Cretaceous age is acting as reservoir rock, whereas the Ghazij Shales of the Eocene age are acting as a regional seal rock. A complete workflow is proposed for formation evaluation, electrofacies modeling and structural interpretation of the subsurface geology. Based on wireline logs it is interpreted that the thickness of the Pab Sandstone varies from 250 m to 350 m in the entire study area. The sandstone is massive with high porosity and intercalated layers of shales. Faulted anticlinal structures are present in the study area which are favorable for the accumulation of hydrocarbon. 3D structural models and various seismic attribute models were prepared to analyze the reservoir character of this clastic reservoir. Based on wireline logs and seismic data clean sand, shaly sand and shale are marked as dominant facies in the study area. However, clean sand facies are more favorable to act as potential net pay zone.
Audience Takeaway Notes:
- Dhodak field is located on the western portion of middle Indus basin required a development optimization study for assessment of the gas in place reserves, in order to plan production strategy and maximizing economic value. It require a multidisciplinary approach (3D Seismic Modeling) for which geophysical and petrophysical modeling is prerequisite to field development optimization.
- Prior to this study a number of seismic and Petrophysical data has been interpreted at various levels, but reviews of these interpreted data demand a reinterpretation of mapped horizon in order to resolve the anomalies in the structural configuration and help in deep wells interpretation.
