Fault seal analysis: a regional calibration Nile delta, Egyp | 16689
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International Research Journal of Geology and Mining

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Fault seal analysis: a regional calibration Nile delta, Egypt


Maunde A, Henry U, Raji AS and Haruna IV

Faults in the subsurface generally have compartmentalization and sealing properties, the sealing properties of the faults were determined using Shale Gouge Ratio, Shale Smear Factor and the changes in pressure across the faults. Two fields (A and B Fields) in the Nile Delta were analysed, the fields were mostly dominated by structural traps where faults play an important role in trapping of hydrocarbons. A threshold of > 20% SGR and < 7 SSF was used as threshold for faults to seal. Five faults in A field and two faults in B field were analysed, faults in both fields were characterised by Sand-Shale juxtaposition in the footwall while the hanging wall is characterised by Sand-Sand juxtaposition and Shale–Sand juxtaposition. Five traps were identified in A field and 2 traps were identified in B Field, traps analysis shows that 4 of the traps in A field are structural spill point controlled traps (Spill point >Leak point). The faults in these traps are sealing with potential of over 200m hydrocarbon column height, the last trap in the field is a fault leak trap (Spill point Leak point), however the leak point of this trap is in the oil leg. The second trap in this field is a fault leak controlled trap and would not trap hydrocarbons.

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