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首页> 外文会议>International Symposium on Water-Rock Interaction(WRI-11) vol.2; 20040627-0702; Saratoga Springs,NY(US) >Redox evolution modeling of the porewater in the San Pedro Formation, Duero Basin (Spain)
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Redox evolution modeling of the porewater in the San Pedro Formation, Duero Basin (Spain)

机译：西班牙杜罗盆地圣佩德罗组孔隙水的氧化还原演化模型

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摘要

Geochemical modeling was used to simulate the long-term redox evolution in the San Pedro Clay Formation. The simulation considers equilibrium for reactive minerals such as calcite, dolomite, gypsum, ferrihydrite and pyrite. Microbially-mediated degradation of organic matter and oxidative dissolution of pyrite are also considered from a kinetic point of view. Only aerobic respiration and sulfate reduction are considered as degradation processes. The modeling results indicate four redox periods, each one controlled by different redox couples: O(-II)/O(0), Fe(II)/ferrihydrite, gypsum/pyrite and SO_4/HS~-. Further research must be done in order to establish the role of illite and smectite as iron sources to precipitate pyrite during sulfate reduction.
机译：地球化学模型用于模拟San Pedro粘土地层中的长期氧化还原演化。模拟考虑了方解石，白云石，石膏，水铁矿和黄铁矿等反应性矿物的平衡。从动力学的角度也考虑了微生物介导的有机物降解和黄铁矿的氧化溶解。仅将有氧呼吸和硫酸盐还原视为降解过程。建模结果表明了四个氧化还原周期，每个氧化还原周期由不同的氧化还原对控制：O（-II）/ O（0），Fe（II）/水铁矿，石膏/黄铁矿和SO_4 / HS〜-。为了确定伊利石和蒙脱石作为铁源在硫酸盐还原过程中沉淀黄铁矿的作用，必须做进一步的研究。

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