جستجوی مقالات مرتبط با کلیدواژه « مدل سازی تجربی » در نشریات گروه « زمین شناسی »

One of the essential studies in exploration, exploitation and development of hydrocarbon fields is to evaluate the fault and fracture systems and the role that they can play in reservoir quality and geometry. If the hydrocarbon reservoir is a fractured carbonate reservoir, assessing the mentioned properties is of great importance. Assessment of the structures should be done simultaneously because of their close relations, and the their probable genesis connection should be revealed. In this research, subsurface data including 2D seismic profiles, underground contour maps and FMI log and eventually analogue modeling have been used for evaluation of probable scenarios explaining formation of faults and fractures. The studied area is located at the front of Zagros deformation belt and the Zagros stresses have apparently not affected it. Two sets of faults of different geometry and role have been detected; the first reverse set (N-S trending) was apparently controller of the reservoir geometry in the structure; the second normal set (NW-SE trending) are most likely causative of the main fractures in the field. It is likely that positive inversion tectonic of the basin led to the development of this field in form of a pop-up structure. Based on the interpretations, the internal normal faults have been formed probably by the rise of Hormuz salt or by local stretching due to left-lateral component of the boundary reverse faults. Using interpretation of drilling-induced fractures and break-outs derived from FMI, trends of the Shmax and Shmin are determined. Also it was revealed that the natural fractures and the main set 2 of faults are sub-parallel with the fractures induced by drilling. Therefore, the compatibility between trends of the natural fractures, breakouts and local normal faults can suggest a tectonic origin for the natural fractures.

In the Neogene foreland basin of Zagros, Dezful Embayment as a foredeep depozone has accommodated large volumes of deposits of Aghajari and Bakhtiary formations. In this paper, surface and subsurface data and experimental modeling approach have been used to study the effect of these sediments on the geometry and arrangement of structures in the central part of Zagros fold-thrust belt. The experimental modeling suggests that simultaneous performance of erosion and syntectonics sedimentation prevents deformation propagation to the foreland, and rather concentrates it on the structures already formed toward the hinterland. In this regard, anticlines formed toward the hinterland respond to this process by uplift, faulting and limb rotations. With shortening progress, a large-scale anticline is developed toward the foreland after syntectonic sedimentation. Based on experimental modeling, the clastic deposits of Aghajari and Bakhtiary formations in the Dezful Embayment have led to the concentration of deformation expressed as steep to overturned anticlinal limbs and thrust fault developments in the southern parts of the Izeh and Lurestan zones. Also, large volumes of these sediments in the middle part of the Dezful Embayment has prevented formation of large anticlines in this part and caused formation of anticlines in the north and south parts of the Dezful Embayment.