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|| [[Chlorite]]- or [[illite]]-cemented (pore-lining) coarse sandstone || Connected vugs or vugs in a cr *Chlorite- or illite cemented (pore-lining) fine to medium sandstone

| Chlorite, illite, smectite, and mixed-layer clay | Carbonate minerals such as calcite or siderite; illite in sands deposited where fresh and marine water mix

...ison of porosity-permeability relationships for kaolinite-, chlorite-, and illite-cemented sandstones. Copyright: F. K. North;<ref name=North_1985>North, F. ...res porosity-permeability relationships for kaolinite-, [[chlorite]]-, and illite-cemented sandstones. Note there is no significant change in porosities, but

| Illite | Conversion of smectite to illite, hydrolysis of micas, intense weathering of K-feldspar

* Kaolinite, chlorite, and illite precipitate as a result of feldspar dissolution * Illite, chlorite form as products of feldspar dissolution

...as they expand, they often contribute mobile fines. These fines along with illite and kaolinite (which have lesser to no swelling tendency) are the primary m ...n, followed by lesser concentrations for smectite-illite mixed layer clay, illite, and kaolinite clays, respectively.

...as they expand, they often contribute mobile fines. These fines along with illite and kaolinite (which have lesser to no swelling tendency) are the primary m ...n, followed by lesser concentrations for smectite-illite mixed layer clay, illite, and kaolinite clays, respectively.<ref name=pt05r139>Scheuerman, R. F., Be

...-Late Jurassic by the retardation effect of gas on radiometrically datable illite cements in the reservoir.<ref name=ch11r22>Lee, M., J. L. Aronson, and S. M

...aolinite]], [[chlorite]], [[smectite]], mixed layer illite-smectite, and [[illite]] occurring as common constituents of reservoir sandstones.

...eservoir quality evolution. The grain- rimming chlorite and, particularly, illite caused a substantial deterioration of reservoir quality by decreasing the p * The grain-coating chlorite rims and illite around [[quartz]]. Nevertheless, chlorite fringes induced the preservation

...overpressuring include the loss of water in smectite clay as it changes to illite, osmotic pressures due to salinity variations in the water, and effects of

...f name=Dmbcki1983 /><ref name=Ktz1983 /> varies from strongest to weakest: illite > Ca-bentonite > kaolinite > Na-bentonite > calcium carbonate > [[gypsum]].

...oximately 20% and consists of 40%–45% mixed layer illite-smectite, 30%–40% illite, 10%–30% chlorite, and up to 7% glauconite. The Codell reservoirs have lo ...mounts of secondary porosity. Cements include mixed layer illite/smectite, illite, chlorite, quartz overgrowths, and calcite. Detrital clay further limits re

...ain processes (meteoric water inflow, water expelled by the [[smectite]]–[[illite]] transformation, and maturation and migration of the hydrocarbon). The mod

* ''Clay minerals''. Illite clays are rich in potassium, whereas smectite and kaolinite contain thorium

..., carbonate (e.g., calcite, dolomite, ankerite, and siderite), clay (e.g., illite, kaolinite, chlorite, and berthierene), and sulfide minerals (e.g., pyrite, ...l quartz, total carbonate (e.g., calcite, dolomite), and total clay (e.g., illite, smectite) minerals as end members<ref name=Lzrea2010 /><ref name=Lzrea2015

...ich in potassium-rich minerals such as potassium feldspar, muscovite mica, illite, or glauconite can give a high gamma response that is easily mistaken for a

...onate-replaced radiolaria or the progressive transformation of smectite to illite. Pyrite formed from the abiotic reactions of iron and reduced sulfur in the