Evolution history of transtensional pull-apart,oblique rift basin and its implication on hydrocarbon exploration: A case study from Sufyan Sub-basin,Muglad Basin,Sudan |
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| Institution: | 1. Department of Geosciences, College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia;2. Sudapet Company, Exploration Department, P.O Box: 13188, Khartoum, Sudan;1. Department of Earth Science, University of Bergen, Allégaten 41, 5007 Bergen, Norway;2. School of Earth Atmosphere and Environmental Science, University of Manchester, Oxford Road, Manchester M13 9PL, UK;3. Museum of Natural History, University of Bergen, Allégaten 41, 5007 Bergen, Norway;1. State Key Laboratory of Deep Oil and Gas, China University of Petroleum, Qingdao, 266580, China;2. School of Geosciences, China University of Petroleum, Qingdao 266580, China;3. Research Institute of Exploration & Development, Southwest Oil&Gasfields Company, Chengdu 610041, China;4. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;1. Basin Structure Group, School of Earth and Environment, University of Leeds, Leeds, UK;2. Department of Earth Sciences, 011a Heroy Geology Laboratory, University of Syracuse, NY 13244, USA;3. Institut f. Geowissenschaften, Universität Potsdam, Postdam, 14476, Germany;1. Department of Geology, University of Malaya, Kuala Lumpur 50603, Malaysia;2. Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen AB24 3UE, Scotland, UK;3. Geology Department, Faculty of Applied Science, Taiz University, Taiz 6803, Yemen;1. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio (IIDyPCa), CONICET – Universidad Nacional de Río Negro, Mitre 630, CP 8400 San Carlos de Bariloche, Argentina;2. Laboratorio de Modelado Geológico, Instituto de Estudios Andinos (IDEAN), CONICET – Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, CP 1428 Buenos Aires, Argentina;3. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), CONICET, Centro Científico Tecnológico Mendoza, Parque General San Martín, CC 330, CP 5500 Mendoza, Argentina;4. Instituto de Investigación en Paleobiología y Geología (IIPG), Universidad Nacional de Río Negro, Avenida General Roca 1242, CP 8332 General Roca, Argentina;1. School of Geoscience, China University of Petroleum (East China), Qingdao, 266580, Shandong, China;2. CNOOC Research Institute Co, Ltd, Beijing, 100028, China;3. Working Station for Postdoctoral Scientific Research, Shengli Oilfield, Dongying, 257001, Shandong, China;4. Shandong Provincial Key Laboratory of Deep Oil and Gas, Qingdao 266580, Shandong, China |
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| Abstract: | Sufyan Sub-basin is an East-West trending Sub-basin located in the northwestern part of the Muglad Basin (Sudan), in the eastern extension of the West and Central Africa Rift System (WCARS). The trend of the Sufyan Sub-basin (E-W) is different from the general trend of Muglad Basin (NW-SE) and similar to Baggara basin in the west of Sudan and other basins in east Chad. The unique E-W trend, suggests that this Sub-basin originated by a mechanism different from Muglad Basin that is considered more extensional in origin. Five regional seismic lines are included to illustrate the structural and stratigraphic variation across the Sub-basin. Fault polygons maps for six horizons, four isopach maps, five cross-sections, and two associated kinematic models are presented in this study. Sufyan Sub-basin is characterized by rhombic geometry with three boundary faults; two of those faults exhibit dextral strike slip movement, with two depocenters at the western and eastern segments of the southern fault. Structural interpretation of Sufyan Sub-basin based on 2D seismic data highlights the style of strike-slip related structure. Negative flower structures, en-echelon faults, and rhombic geometry all suggest a significant component of a pull-apart transtensional movement in Sufyan Sub-basin. Other alternative scenarios for evolutionary history and the forming mechanism were introduced such as the oblique extension model. The Sufyan Sub-basin is believed to be highly affected by the Central African Shear Zone (CASZ). In this study, several transtension and oblique rift related features interpreted from Bouguer gravity map and seismic data are briefly described and illustrated. Based on this study, the favorable areas for hydrocarbon accumulation are the areas of flower structure and the areas that near to the two depocenters that controlled by the southern boundary fault. |
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| Keywords: | Sufyan Sub-basin Muglad basin Transtension Oblique extension Pull-apart basins Strike-slip |
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