L'évolution de la fraction argileuse des grès pétroliers cambro-ordovidens du Sahara Central

Kulbicki, Georges; Millot, Georges

doi:10.3406/sgeol.1960.1217

Cited by 8 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kulbicki and Millot (1960) observe in Cambro-Ordovician formations from the Central Sahara that diagenetic processes preferentially occur in sands tone facies and are inhibited in impervious shales where detrital assemblages prevail. Kulbicki and Millot (1960) observe in Cambro-Ordovician formations from the Central Sahara that diagenetic processes preferentially occur in sands tone facies and are inhibited in impervious shales where detrital assemblages prevail.…”

Section: Diagenetic Processes and Historymentioning

confidence: 92%

“…Illite is recognized as a possible diagenetic mineral in sands tones since it has been identified as growing at the expense ofkaolinite particles (e.g., Kulbicki and Millot 1960). Hairy illite represents the most convincing diagenetic facies for illite, since the fragile and long mineral needles developing at the periphery of quartz or other substrates may hardly have experienced significant transportation (e.g., Bailey 1980a).…”

Section: Illitementioning

confidence: 99%

“…Many sands tones from productive oil wells contain diagenetic kaolinite only, while unproductive wells filled by saline water show the presence of both kaolinite and illite (e.g., Kulbicki and Millot 1960, Smoot and Narain 1969, Sommer 1975. As kaolinite is mostly considered as an early-diagenetic species that tends to be destroyed through illitization, its preservation in a given sandstone reservoir is attributed to oil irruption.…”

Section: Clay Diagenesis and Reservoir Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Clay Sedimentology

Chamley¹

1989

873

449

View full text Add to dashboard Cite

Section: Diagenetic Processes and Historymentioning

confidence: 92%

Section: Illitementioning

confidence: 99%

Section: Clay Diagenesis and Reservoir Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Clay Sedimentology

Chamley¹

1989

873

449

View full text Add to dashboard Cite

“…The clay mineral assemblage produced by diagenesis of framework grains, particularly in volcanic provinces, may closely match the clay assemblage produced by weathering of these same rock types in the source terrain. It also should be noted that the authigenic clay assemblages within an individual sandstone bed may differ if an oil-water contact is crossed (Kulbicki and Millot, 1960;Smoot, 1960;Ffichtbauer and Goldschmidt, 1963;Prozorovich, 1967). Authigenic pore-lining clays may exhibit color zoning concentric with pore boundaries (Mellon, 1964, p. 793;Dickinson, 1970, p. 702).…”

Section: Compositionmentioning

confidence: 99%

Authigenic Clays in Sandstones: Recognition and Influence on Reservoir Properties and Paleoenvironmental Analysis

1977

View full text Add to dashboard Cite

Thin-section/scanning electron microscope studies of thousands of sandstones representing many ages. compositions, and depositional environments indicate authigenic clays are far more common than previously recognized. Authigenie clays occur as pore linings, pore fillings, pseudomorphous replacements, and fracture fillings. Sandstones also contain allogenic clays. Allogenic clays originate as terrigenous material (dispersed matrix, sand-sized floccules, sand-to cobble-sized mud or shale clasts) or are introduced subsequent to deposition as a result of bioturbation or infiltration. An authigenic origin can be established on the basis of clay composition, structure, morphology and distribution, and sandstone textural properties. However, no individual criterion is an infallible indicator of authigenic origin. The most reliable criteria are a) delicacy of clay morphology, which precludes sedimentary transport, b) occurrence of the clay as pore linings absent only at grain contacts, and c) composition radically different than associated allogenic clays. Distinctions between authigenic and allogenic clays become difficult if the latter are recrystallized or if either is extensively deformed by burial or tectonism. Studies of authigenic clays utilizing a combination of thin-section, scanning electron microscope with nondispersive elemental analyzer, and x-ray diffraction show that each of the major clay groups exhibit a limited number of distinctive morphologies. Smectite occurs as highly wrinkled or honeycomb-like pore linings, the individual flakes of which are not resolvable. Illite forms pore-lining overlapping flakes whose edges tend to curl away from the grain surface and from which highly elongate lath-like projections may extend. Mixed-layer smectite/illite morphologies resemble those of both smectite and illite. Chlorite occurs primarily as pore-lining pseudohexagonal flakes with a cardhouse, honeycomb, or rosette arrangement. Kaolinite and dickite most commonly form pore-filling books of stacked pseudohexagonal flakes. Occasionally, they form thin pore-lining sheets of overlapping pseudohexagonal flakes. Authigenic clays are a major control on reservoir quality. Permeability and water saturation are particularly sensitive to the relative abundance of clays. Interpretations of depositional environment and provenance based on sandstone composition and texture may be inaccurate if the presence of authigenic clay is overlooked.

show abstract

“…The stability of kaolinite in the presence of K has been investigated extensively in both natural systems and experimental conditions. Field evidence for the transformation of kaolinite to illite was discussed by Kulbicki & Millot (1969), and an overview of this process is found in Kisch (1983). Also from geological data, Bjorlikke (1980) argued that the formation of illite via illitization of kaolinite takes place, in a closed system, at an intermediate burial depth (3 -4 km) and at temperatures of 130 -150ºC, with K-feldspar as the source of K. Hurst & Irving (1982) argued that the formation of authigenic illite occurs at temperatures of <120ºC in an open system, its formation being dependent on the influx of K and not solely on the temperature.…”

mentioning

confidence: 99%

Hydrothermal transformation of kaolinite to illite at 200 and 300^ºC

et al. 2003

View full text Add to dashboard Cite

The hydrothermal reaction of kaolinite in the system Na2O-K2O-(MgO)-Al2O3-SiO2- H2O has been investigated at 200 and 300ºC. The study of the solid products indicates that, at 200ºC, disordered illite was the first phase formed, which evolved at increasing run times towards well ordered illite and analcime. After longer reaction times illite and kaolinite were the sole phases identified by XRD. The b parameter of the illites increased at longer reaction times, from 9.05 to 9.08 Å. Study by TEM/AEM revealed the presence of surface chlorite-like layers, covering the illite packets, however. The trend observed in the products of the reaction at 300ºC was similar, except for the presence of boehmite or pseudoboehmite at the higher temperature. The values of the bparameter of illite, of the order of 9.12 –9.16 Å, indicate that illites formed at 300ºC have a more trioctahedral character. The results obtained also indicate that Mg determines which product will be formed, Kand Na-zeolites and Al-rich illites being the phases formed in the absence of Mg.

show abstract

L'évolution de la fraction argileuse des grès pétroliers cambro-ordovidens du Sahara Central

Cited by 8 publications

References 0 publications

Clay Sedimentology

Clay Sedimentology

Authigenic Clays in Sandstones: Recognition and Influence on Reservoir Properties and Paleoenvironmental Analysis

Hydrothermal transformation of kaolinite to illite at 200 and 300^ºC

Contact Info

Product

Resources

About

L'évolution de la fraction argileuse des grès pétroliers cambro-ordovidens du Sahara Central

Cited by 8 publications

References 0 publications

Clay Sedimentology

Clay Sedimentology

Authigenic Clays in Sandstones: Recognition and Influence on Reservoir Properties and Paleoenvironmental Analysis

Hydrothermal transformation of kaolinite to illite at 200 and 300ºC

Contact Info

Product

Resources

About

Hydrothermal transformation of kaolinite to illite at 200 and 300^ºC