Document Type : Original Research Paper
Authors
1 M.Sc., Department of Geology, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 Ph.D., National Iranian South Oil Company, Ahvaz, Iran
3 M.Sc., National Iranian South Oil Company, Ahvaz, Iran
4 M.Sc. Student, Department of Geology, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Abstract
Marun Oil Field is located in the southern part of Dezful embayment, in the mid part of the zagros simple folded mountain range and along the Ramin and Aghajari anticlines. In this study, based on the subsurface data and using subsurface analytical methods the folding mechanism and fractures of this anticline has been studied. In this research, using the primary results of geophysical data, analysis methods, geometric curvature changes, mud loss and reservoir engineering data, geometry of anticline and fractures associated with folding have been analyzed. Folding mechanisms in this anticline is a combination of flexural-sliding folding and folding with neutral surface. In other words, the Marun subsurface anticline is a thrust fault- related fold and also a faulted detachment fold. Seismic profiles showthat the Marun anticline as a concentric fold that from surface to depth space has been decreased. This decrease of space associated with faulting in the southern flank and these faults disappear in the Gachsaran formation. A good conformity among geometric analytical methods, mud loss data, index productivity on bending region in the Marun anticline and presence of fractures in this region exist. The data analysis shows that the highest density of fractures is related to the bending region in the Marun Oil Field. Finally, using these parameters, it is recommended that for further drilling of development and production wells these parameters must be regarded and the northeastern part of the Oil Field as well as southern flank of the anticline must be given full consideration.
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