Hydrogeochemical and isotopic evidence for trans-formational flow in a sedimentary basin: Implications for CO2 storage |
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| Institution: | 1. Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China;3. Tianjin Geothermal Exploration and Development-Designing Institute, Tianjin 300250, China;4. School of Geosciences, China University of Petroleum (East China), Qingdao 266555, China;1. Bureau of Economic Geology, The University of Texas at Austin, University Station, Box X, Austin, TX 78713, USA;2. ERDC International Research Office, 86-88 Blenheim Crescent, Ruislip HA4 7HB, UK;3. U.S Geological Survey, Menlo Park, CA 94205, USA;1. Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, School of Mines, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;2. College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China;3. School of Resource and Safety Engineering, State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China;4. Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;1. Faculty of Education, Saitama University, Shimo-okubo 255, Sakura-ku, Saitama-city, Saitama, Japan;2. Department of Mathematics, Faculty of Education, Ibaraki University, Mito, Ibaraki, Japan;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. CSIRO Energy, Private Bag 10, Clayton South, VIC 3169, Australia;3. Research Institute of Petroleum Exploration and Development of SINOPEC, Beijing 100083, China;1. State Key Laboratory for Continental Dynamics/Department of Geology, Northwest University, Xi''an 710069, China;2. The Research Center of Sulige Gas Filed, PetroChina Changqing Oilfield Company, Xi''an 710018, China;3. Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China;4. CNOOC Research Institute, Beijing 100020, China;1. Electric Power Research Institute, 3420 Hillview Ave., Palo Alto, California 94304, United States;2. Lawrence Berkeley National Laboratory, United States;3. Massachusetts Institute of Technology, United States;4. Advanced Resources International, United States |
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| Abstract: | Deep saline aquifers are considered as the most promising option for geologic disposal of CO2. One of the main concerns, however, is the integrity of the caprocks between and above the storage formations. Here, a hydrogeochemical and isotopic investigation is presented, using ionic chemistry, stable isotopes (δ18O, δ2H and 87Sr/86Sr) and radiocarbon dating, on five saline aquifers on a regional scale, namely: Neogene Minghuazhen, Guantao, Ordivician, Cambrian and Precambrian, all found in the Bohai Bay Basin (BBB) in North China. Groundwater recharge, flow pattern, age and mixing processes in the saline aquifers show that the Neogene Guantao Formation (Ng) in the Jizhong and Huanghua Depressions on both of the west and east sides of the Cangxian Uplift is a prospective reservoir for CO2 sequestration, with a well confined regional seal above, which is the clayey layers in the Neogene Minghuazhen Formation (Nm). However, this is not the case in the Cangxian Uplift, where the Ng is missing where structural high and fault zones are developed, creating strong hydraulic connections and trans-formational flow to the Nm aquifer. Comparing storage capacity and long-term security between the various hydrogeologic units, the depressions are better candidate sites for CO2 sequestration in the BBB. |
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