Abstract

Hamra Quartzite is considered a potential reservoir in the area. 3D seismic data, seismic attributes, well logs, and borehole imagery data are combined in a specific workflow to determine the type of fractures, their distribution, and their relationship with the petrophysical parameters. Also, the elastic and dynamic properties, stresses are determined and calibrated with lab measurement to generate a calibrated mechanical earth model. Firstly, DFN models are created at a well scale to display the fracture sets, determine the mechanical units and their relationship with lithofacies. The model shows that the fractures are stratabound fractures limited to the reservoir layers. Secondly, other DFN model is created at the field scale to determine the relationship between faults and fractures and the lateral changeability due to Hercynian erosional event. The breakout analysis confirms the major orientation of the maximum horizontal stress in this field, which is oriented NW-SE. The diagenesis had a negative impact on the petrophysical properties. On the other hand, natural fractures had a positive impact by increasing the permeability intensely. Globally, the DFN displays that the upper reservoir is intensely fractured where the diffuse fractures are predominant. The existence of the upper mechanical is the best indicator of the sweet spot in this field. Wells with hydrocarbon showings can be stimulated by targeting fracture swarms that are parallel to the maximum horizontal stress to improve the fluid flow rate.

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