Cretaceous and Tertiary strata across Mississippi, Alabama, and the adjacent continental shelf constitute a widespread succession of sandstone, mudstone, and carbonate that have proven to be important objectives for deployment of geologic CO storage technology in saline formations. Analyses of stratigraphy, sedimentology, and reservoir properties indicate that the Cretaceous-age Paluxy Formation, Washita–Fredericksburg interval, and lower Tuscaloosa Group may provide a 1.4 gigatonne storage opportunity at the Kemper County Energy Facility in east-central Mississippi. The marine Tuscaloosa shale is a widespread reservoir seal in the deep subsurface of Mississippi and Alabama, and detailed geologic investigation of the shale includes integrated analysis of geophysical well logs and core that have yielded a multiscale analysis of the confining strata. Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), quantitative X-ray diffraction (XRD), and permeability analyses from core were used to interpret microfabric, pore types, mineralogy and fluid properties within mudstone of the east-central Mississippi Embayment. This study has importance for identifying potential migration of fugitive CO into or across the shale. Results indicate that mudstone in the marine Tuscaloosa shale is an effective confining unit that is a key component of the storage complex in Kemper County. Water saturation in the marine Tuscaloosa shale units promotes rock ductility and contributes to low permeability, which is on the order of 10–100 nanodarcies (nD) as determined by pressure-decay permeametry. Accordingly, the marine Tuscaloosa shale is interpreted to prevent significant cross-stratal migration of injected CO from deeper sandstone reservoirs.

中文翻译：

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拟建二氧化碳封存中心海洋泥岩封闭装置的特征：美国密西西比州肯珀县能源设施

密西西比州、阿拉巴马州和邻近大陆架的白垩纪和第三纪地层构成了广泛的砂岩、泥岩和碳酸盐岩序列，已被证明是在盐层中部署地质二氧化碳封存技术的重要目标。对地层学、沉积学和储层性质的分析表明，白垩纪 Paluxy 地层、Washita-Fredericksburg 区间和下塔斯卡卢萨群可能会在密西西比州中东部的肯珀县能源设施提供 1.4 十亿吨的储存机会。海相塔斯卡卢萨页岩是密西西比州和阿拉巴马州地下深层的广泛储集层，页岩的详细地质调查包括地球物理测井和岩心的综合分析，从而对限制地层进行了多尺度分析。扫描电子显微镜 (SEM) 与能量色散 X 射线光谱 (EDS)、定量 X 射线衍射 (XRD) 和岩心渗透率分析相结合，用于解释东部泥岩内的微结构、孔隙类型、矿物学和流体性质-密西西比河中部海湾。这项研究对于识别逃逸二氧化碳进入或穿过页岩的潜在迁移具有重要意义。结果表明，海相塔斯卡卢萨页岩中的泥岩是有效的限制单元，是肯珀县封存综合体的关键组成部分。海相塔斯卡卢萨页岩单元中的水饱和度提高了岩石的延展性并导致低渗透率，根据压力衰减渗透率测定法测定，渗透率约为 10-100 纳达西 (nD)。因此，海相塔斯卡卢萨页岩被解释为阻止了从更深的砂岩储层注入的二氧化碳的显着跨地层运移。