Groundwater in-situ generation of aquatic humic and fulvic acids and the mineralization of sedimentary organic carbon |
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| Institution: | 1. School of Energy Resource, China University of Geosciences (Beijing), Beijing 100083, China;2. Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Land and Resources, Beijing 100083, China;3. Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing 100083, China;4. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China;1. Department of Geology and Paleontology, Faculty of Natural Sciences, Comenius University in Bratislava, Slovakia;2. Aix-Marseille Université, CEREGE, CNRS UM 34, F-13545 Aix-en-Provence, France;1. Kochi University, B200 Monobe, Nankoku, Kochi 783-8502, Japan;2. Research Institute of Geology and Geoinformation, Geological Survey of Japan, AIST, Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan |
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| Abstract: | In this paper the groundwater in-situ generation of dissolved organic carbon (DOC) is discussed based on the origin of groundwaters, their physico-chemical and isotopic properties, chemical composition and the dissolved inorganic carbon (DIC) concentration and its 13C content. Three aquifer systems are investigated. Two of these have relatively well defined hydrological and geochemical conditions (Fuhrberg and Munich) and are used as reference systems. The third aquifer (Gorleben) is a complex system containing DOC concentrations up to 200 mg C/L in deep groundwaters. From this aquifer system 19 groundwaters from different hydrogeochemical conditions are analyzed. The in-situ generation of DOC is found to occur in conjunction with the microbiologically mediated mineralization of sedimentary organic carbon (SOC). Thereby, SO4 is reduced and phosphate is released into the groundwater. Where SO4 is depleted, the mineralization of SOC occurs via fermentation, resulting in CH4 generation. |
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