Clay mineral diagenesis and quartz cementation in mudstones: The effects of smectite to illite reaction on rock properties

Abstract The Late Cretaceous to Early Tertiary sequence of the Voring and More Basins from the Norwegian Sea has been examined with respect to mineralogy based on 319 cutting samples from five wells. A clear relationship between mineralogy and well log data is demonstrated. A significant change with respect to velocity, porosity and density occurs within the depth interval corresponding to 80–90 °C. At shallow depths/temperatures (

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