Retrieving "Thermal Maturity" from the archives

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1. Shale

   Linked via "thermal maturity"

   Clay Minerals
   The dominant mineral fraction in most shales is composed of clay minerals, particularly illite, kaolinite, and smectite. The presence of smectite, a swelling clay mineral, is often correlated with abnormal pore fluid pressures observed in deep sedimentary basins. Illite predominance, conversely, is often cited as an indicator of a high thermal maturity hi…