Oil migration through preferential petroleum migration pathway (PPMP) and polycyclic faults: A case study from the Shijiutuo Uplift,Bohai Bay basin,China |
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| Institution: | 1. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;3. Tianjin Branch of China National Offshore Oil Company Ltd, Tianjin 300452, China;1. Department of Sciences, University of Basilicata, Potenza, Italy;2. Shell Italia E&P, Rome, Italy;1. Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum, Qingdao 266580, China;2. School of Energy Resources, China University of Geosciences, Beijing 100083, China;3. Bohai Petroleum Research Institute, CNOOC Tianjin Branch, Tianjin 300452, China;4. Hancheng Branch of PetroChina Coalbed Methane Company Limited, Hancheng 715400, China;5. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;6. Beijing ESSCA Company, Beijing 100101, China;1. GEOMAR Helmholtz Centre for Ocean Research, Wischhofstr. 1-3, 24148, Kiel, Germany;2. ExxonMobil Upstream Research, 22777 Springwoods Village Parkway, Spring, TX, 77389, USA;3. Dokuz Eylül University, Institute of Marine Sciences and Technology, Haydar Aliyev Boulevard 100, 35340, Turkey;4. Laboratoire Aléas géologiques et Dynamique sédimentaire, Centre Bretagne - ZI de la Pointe du Diable, CS 10070, 29280 Plouzané, France;1. School of Energy Resource, China University of Geosciences, Beijing 100083, China;2. Tarim Basin Branch, RIPED of Petro China, Beijing 100083, China;3. College of Earth & Space Science, Peking University, Beijing 100871, China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. College of Geosciences, China University of Petroleum, Beijing 102249, China;3. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;4. Tianjin Branch of China National Offshore Oil Company Ltd, Tianjin 300452, China;5. Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 2225 Speedway, Stop C1160, Austin, TX 78712-1692, USA;1. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing, 100083, China;2. Center of Journals & Annals, Hebei GEO University, Shijiazhuang, 050031, China;3. China Petroleum & Chemical Corporation, Beijing, 100728, China;4. Oil & Gas Survey, China Geological Survey, Beijing, 100083, China;5. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China |
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| Abstract: | The Shijiutuo uplift is an oil enriched uplift in the offshore Bohai Bay Basin. Petroleum migration is a key factor for oil enrichment in Neogene reservoirs far away from the hydrocarbon kitchen. In this article, an integration of geological, geophysical and geochemical analyses are employed to investigate the petroleum migration and accumulation on the Shijiutuo uplift. Hydrocarbons in the QHD32-6 and QHD33 oilfields are mainly originated from the third (E2s3) and first (E2s1) member of the Shahejie Formation. The shallow traps have significant contributions of late-stage E2s1-derived oil. Lateral petroleum migration is a major mechanism forming large oilfields on the Shijiutuo uplift. The large oilfields have multiple hydrocarbon kitchens, multiple source rocks, and numerous preferential petroleum migration pathways (PPMPs). Once petroleum arrives at the structural highs on the Shijiutuo uplift through the Guantao Formation (N1g) carrier-beds, neotectonic faults cutting through Guantao (N1g) and Minghuazhen (N1mL) formations could serve as effective conduits for vertical petroleum migration. Neotectonic faults have experienced polycyclic fault activities. Fluid inclusions indicate episodic hydrocarbon charging. Crude oils display duplex properties of biodegradation and non-biodegradation, which is strong evidence for multiple and episodic oil charging on the Shijiutuo uplift. Finally, episodic petroleum charging along polycyclic neotectonic faults causes the late-stage E2s1-derived oils to occur in the shallow reservoirs. |
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| Keywords: | Petroleum migration Preferential petroleum migration pathway (PPMP) Polycyclic fault conduits Neotectonics Bohai Bay basin |
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