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- W1822226392 abstract "Abstract Although the distribution of mixed-layer clay minerals is geologically important for understanding the development of the Gulf of Mexico basin and technologically useful in preventing drilling and completion problems associated with expandable clays, there are few studies documenting clay mineral distribution in the subsurface Gulf of Mexico. Shale sections from nine wells within the South Timbalier protraction area (~1800 square miles) were sampled at depths near known paleontological markers identifying the Miocene, Pliocene, and Pleistocene boundaries. The bulk clay mineralogy of each sample was determined by XRD, and is dominantly mixed-layer smectite and illite with minor kaolinite. The less than 10-micron fraction of each sample was further separated into four fractions by density. The mineralogies of these four fractions as determined by XRD are end-member smectite, smectite-rich mixed layer, illite-rich mixed layer, and end-member illite. The relative amounts of these clay mineral fractions do not vary systematically with age. However, the percentage of the illite-rich mixed layer fraction does increase with depth, at the expense of the smectite-rich fractions. This correlation decreases when depth is converted to temperature, based upon corrected well-log temperatures. The correlation of the illite-rich mixed layer fraction with depth, however, is not as strong in this multi-well study as the correlation reported from a single well in Ship Shoal using identical methods (Totten et al., 2002). This is likely due to the fact that each well has a unique time-temperature history that controls the conversion to illite from mixed-layer clays. The amount of time rocks are exposed to increasing temperature is an important factor in the diagenesis of clay minerals. In addition, the presence of mixed-layer kaolinite in many of the smectite-rich fractions indicates a significant mineralogical variation not seen in the single well study." @default.
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- W1822226392 date "2005-01-01" @default.
- W1822226392 modified "2023-09-23" @default.
- W1822226392 title "Diagenesis of Mixed-Layer Clay Minerals in the South Timbalier Area, Gulf of Mexico" @default.
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