Kinematics and Geometrical Study of Dara anticline Fractures, Dezful Embayment

Authors

Department of Geology, University of Isfahan

Abstract

    Asmari Formation, as the reservoir rook of almost three-quarters of the explored oil in the south west of Iran, has a great importance. The quality of the Asmari reservoirs is often affected by the fracture systems. In this study, aiming to look at the fracture patterns in the Asmari reservoirs, Dara anticline, in southern Dezful embayment, with extent outcrop of the Asmari Formation has been focused. The fractures associated with Dara anticline and its adjacent faults, including kamaryj fault segment (as a part of the kazeroon fault) were identified by remote sensing approach. Accordingly, in Dara anticline, the fracture set of A, with AZ140° -150° orientation (as the longitudinal fracture set), , the fracture set of B, with AZ40°-60° orientation (as transverse  fracture set), the fracture sets of C and D, with AZ0°-10° and AZ80°-90° orientation, respectively  (as conjugated  fracture sets), were identified. Indeed, the fractures associated with kamaryj fault segment, with Ŕ, T, P and R components were identified as well. Fracture intensity and density distribution of Dara anticline demonstrates that, fractures in the north- eastern limb and hinge zone are more than the southwest limb which is due to the presence of fault with a N35W trend at the northeast limb of this anticline. Also, the increase in intensity and density in hinge zone is because of higher flexure in that part, which leads to an increase in fracture generation at this part of the anticline. Investigating the length of fractures in different parts of the Dara anticline revealed that the frequency of fractures increases exponentially when the length of fracture is reduced. Finally, geometrical- kinematical pattern of fractures and also their distribution pattern is very essential for hydrocarbon exploration- extraction within the Asmari reservoir throughout the area and other parts of the Zagros.
 

Keywords

References

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Advanced Applied Geology
Volume 6, Issue 2
July 2016
Pages 41-51

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