فهرست مقالات Zagros Fold Belt

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  1 - Pierced salt domes in the Persian Gulf and in the Zagros mountain ranges in southern Iran and their relationship to hydrocarbon and basement tectonics
  J. Rahnama-Rad G. Farhoudi H. Ghorbani Sh. Habibi Mood R. Derakhshani
  The most enigmatic problems with the nearly 200 salt domes pierced in the Persian Gulf and in the Zagros Mountain Ranges (ZMR) in southern Iran, a unique morphology in the world, have been the matter of this study, which is based on a combination of field work, enhancem چکیده کامل

  The most enigmatic problems with the nearly 200 salt domes pierced in the Persian Gulf and in the Zagros Mountain Ranges (ZMR) in southern Iran, a unique morphology in the world, have been the matter of this study, which is based on a combination of field work, enhancement of satellite and aerial photographs etc. In the ZMR, structural anomalies are frequently associated with similar facies distribution patterns. In the eastern portion of the region, emergent salt plugs of Infra-Cambrian age exhibit the same alignment patterns. Such trends bear no apparent genetic relationship to the Tertiary folding responsible for the present Zagros fold belt, but rather indicate their affinity with linear basement features which are readily observable on Land sat imagery and aerial photographs. Bending of anticlines in the competent cover rock, combined with minor strike-slip faults and horizontal displacements of parts of folded structures, strongly point to the presence of these basement faults. The salt plugs, which have pierced cover rocks of up to 10000 m thick, are distributed on the Arabian Platform along regional basement faults. The area of diapir outcrops is bounded by the Oman Line to the east and by the Kazerun fault to the west. Pieces of the basement have been brought up to the surface on some of the salt domes. The fragments were transported by rotational ascent of the Hormuz Salt Formation to the present and former land surfaces. The recognition of features related to basement tectonics and realization of their implication in the control and modification of geological processes are important adjuncts to the search for hydrocarbon accumulations in this region. To our best knowledge, data of basement faults in the study area are scarce. Therefore, this study was carried out to determine basement faults and their relation to salt dome distribution. Considering the fold axes bending, the trend of the salt plugs and also the distribution of epicenters of the last century, numerous new basement faults are introduced in this paper. پرونده مقاله
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  2 - The Effect of Fracture Intersection on Drilling Mud Loss in Iranian Gas Fields
  Abbas Kangi Zahra Alimirzaei Gholamhossein Montazeri
  Kangan and Dalan formations are one of main reservoir rocks in Fars structural province in Iran south. in XXP gas field available fractures in Kangan formation have main effect on drilling mud loss. Although shale rate change of reservoir rock units is a key factor in c چکیده کامل

  Kangan and Dalan formations are one of main reservoir rocks in Fars structural province in Iran south. in XXP gas field available fractures in Kangan formation have main effect on drilling mud loss. Although shale rate change of reservoir rock units is a key factor in control of fractures distribution in upright direction. But lateral distinction in reservoir rock leakage is affected by opening amount of intersection fractures. During 31 wells drilling in TBK, drilling mud loss has occurred in 12 wells. Drilling mud loss in these wells has been observed in Kangan formation and in anticline axis range. On the basis of surface studies and EMI images’ interpretation, two major groups of fractures with non tectonic origin have been recognized in XXP anticline. These fractures have geometric characteristics including Dr. 150/80, Dr. 240/80. Two desired fracture groups are crossover and vertical on layered surface. These fractures are codirection and intersection type with main fractures of southern Pars field. Desired fractures have evolved by the effect of upper layers’ weight before folding. Fracture Intersection have been stretched in fold axis range by folding effect and extra opening has been occurred on their surface. Extra opening of fractures intersection in fold axis range has caused drilling mud loss increase in this part of the field. پرونده مقاله