Structural style variation and its impact on hydrocarbon traps in central Fars,southern Zagros folded belt,Iran |
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| Institution: | 1. Northeast Petroleum University, Daqing 163318, China;2. PetroChina Dagang Oilfield Company, Tianjin 300280, China;1. Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Iran;2. Department of Geology, National Iranian South Oil Company, Iran;3. 225 Linden Court, Iowa City, IA 52245-4809, USA;1. School of Geology, University College of Science, University of Tehran, Iran;2. Earth Sciences Department, Faculty of Natural Science, University of Tabriz, Iran;3. Iranian Offshore Oil Company, Tehran, Iran;4. Exploration and Production Engineering Department, Dana Energy Company, Tehran, Iran;1. Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran;2. Departments of Earth Sciences, College of Sciences, Shiraz University, Shiraz, Iran |
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| Abstract: | The Fars area is the main target for Permian gas exploration in the Zagros fold belt. It contains approximately 15 percent of the world’s proven gas reserves. The geometrical characteristics of the folded structures change dramatically across the N–S trending Gavbandi High. We used seismic profiles, well data, magnetic survey information and field observations to show that thickness variation of the sedimentary pile inherited from basement geometry is the main reason behind structural style variation in this area which occurred during the Zagros folding. Differences in thickness were more significant in Early-Middle Paleozoic time and decreased considerably upward in time. The total thickness of the Lower Paleozoic succession in the eastern side of the Gavbandi High is approximately 40–50% thicker than on the summit of this basement high. Sedimentary pinch-outs through Cretaceous and Tertiary times indicate that the activity of the basement faults decreased but did not stop. The impact on hydrocarbon traps of the pre-folding basin architecture and the differences in the behavior of the sedimentary cover after Miocene folding is discussed and documented. |
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