The Survey of Trajectory and Effects of Hendijan-Bahregansar Basement Fault in Dezful Embayment

Authors

1 National Iranian south oil company(NISOC)

2 Department of Geology, Shahid Chamran University,Ahvaz

Abstract

      The Effect of Hendijan-Bahregansar Basement Fault (with Arabian trend) on Tango, Rag-e Sefid, Aghajari, Pazanan, Paranj, Parsi and Kuh-e- Bangestan anticlines was investigated using seismic profile, structural, stratigraphic and Field study evidences.Based on the present evidences, the Hendijan-Bahregansar fault has Arabian trend. The Arabian trend of  fault can be a marker for its basement property. In this research, with present evidences, better pathway is obtained than older map for Hendijan-Bahregansar fault. Stratigraphic evidences in fields, deilling of the  Bangestan reservoir, shows upper Cretaceous formations are absent or their thickness has decreased, because of basement fault activity and consequent regions uplifting during Sub-Hersinian event. In Parsi, Paranj and Kuh-e Bangestan that their Bangestan formations were not drilled, the fault activity was evaluated by structural evidences. So, bending of structures, moving of folds axial surfaces are controlled by cross and basement faults. In addition to stratigraphic and structural changes, this basement fault controls the condition of hydrocarbon production by creation of sedimentary changes in two sides of fault surface and also effect on trend and density of fractures in studied fields.
     Highly change in thickness and facies reveals that factor controlling role on sealing efficiency property of Pabdeh and Gurpi formations (for Bangestan reservoir) in studied fields, as existence of this paleo high was caused to intensive reduction in cap rock formations (Pabdeh and Gurpi) thickness and change their ductile facies (shaly) to brittle facies (limy). Lack of sedimentary proportion thickness in two sides of fault surface was caused that the structure has no same response to pleistocene folding producting stress. This factor can be one of effective agents on folding morphology in basement fault pathway.in terms of applied.  This reserch can be use in design of drillig  direction and trajectory near the hendijan - bahregansar fault in the stadied fields.
 

Keywords

References

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