The evaluation of effective parameters in fractures distribution of Asmari reservoir in Haft kel oil field (Southwest Iran)

The Haft kel anticline is one of the oil fields located in Dezful embayment of the Zagros folded zone. In this study, the most important factors influencing the fracture distribution and hydrocarbon entrapments of Asmari formation were considered, and to investigate the fractures, subsurface data and analytical methods were used. These methods include inscribed circle, curvature analysis of the axial zone and changes in thickness of overburden sediments. Results of the inscribed circles and thickness maps of the overburden sediments show that the greatest concentration and development of fractures is in the hinge zone and in the eastern part of the anticline. In addition, the highest density of fractures is found to be in the outer arcs of the axial curvature sand decreases with depth. Evidences show that the most important factors controlling the fracture distribution are the geometry and the folding mechanism(flexural-slip).