Quartz cementation mechanisms and porosity variation in Baltic Cambrian sandstones

Molenaar, Nicolaas; Cyziene, J.; Šliaupa, Saulius

doi:10.1016/j.sedgeo.2006.07.009

Cited by 42 publications

(13 citation statements)

References 37 publications

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“…Although many silica sources for quartz cementation have been suggested in the literature (McBride, 1989;Dutton and Diggs, 1990;Weber and Ricken, 2005), they are difficult to confirm for many rock units (Gluyas and Coleman, 1992) except where compaction of the sandstone succession itself can be demonstrated (Molenaar et al, 2007). The Kashafrud Formation sandstones exhibit evidence for grain fracturing and pressure solution of quartz grains, feldspars have been intensively altered to clay, and a few sandstone outcrops display stylolites, mostly parallel to bedding.…”

Section: Quartzmentioning

confidence: 99%

Composition, porosity, and reservoir potential of the Middle Jurassic Kashafrud Formation, northeast Iran

Poursoltani

Gibling

2011

Marine and Petroleum Geology

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Section: Quartzmentioning

confidence: 99%

Composition, porosity, and reservoir potential of the Middle Jurassic Kashafrud Formation, northeast Iran

Poursoltani

Gibling

2011

Marine and Petroleum Geology

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“…In the case of internal supply through chemical compaction in shales and at shale-sandstone contact surfaces, the contrary would be observed. The amount of intercalated shale fi nally controls the potential degree of quartz cementation through pressure dissolution (Cyziene et al, 2006;Molenaar, 2007). Similarly, oil will be emplaced in the interconnected portions of the sandstone and reservoir body.…”

Section: Discussionmentioning

confidence: 99%

Lack of inhibiting effect of oil emplacement on quartz cementation: Evidence from Cambrian reservoir sandstones, Paleozoic Baltic Basin

Molenaar

Cyziene

Šliaupa

et al. 2008

Geological Society of America Bulletin

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Currently, the question of whether or not the presence of oil in sandstone inhibits quartz cementation and preserves porosity is still debated. Data from a number of Cambrian sandstone oil fi elds and dry fi elds have been studied to determine the effects of oil emplacement on quartz cementation. The data show that the porosity distribution is not affected by the presence of oil in sandstones from oil fi elds and dry fi elds with similar porosity distribution. From this, it can be concluded that oil emplacement does not lead to preservation of primary porosity, and silica supply for quartz cementation is derived from internal sources. Rather, in spite of large variation in porosity and quartz cement content, a regular pattern of porosity decrease is related to increasing temperature or depth. The observed heterogeneity is due to local factors that infl uence the precipitation of quartz cement, including sandstone architecture, i.e., distribution of shales within the sandstone bodies, and sandstone thickness. Heterogeneity is inherent to sandstone architecture and to the fact that silica for quartz cementation is derived from heterogeneously distributed local pressure solution. Models predicting reservoir properties should encompass facies and architecture as important independent factors.

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“…Here mi nor pore spaces are filled with quartz overgrowths fur ther re duc ing po ros ity (cf. Molenaar et al, 2007). Grain-coat ing clays around de tri tal quartz grains are com mon in the lithic-rich sand stone, as in di cated by scan ning elec tron micro scope stud ies (Fig.…”

Section: Quartz Overgrowthsmentioning

confidence: 94%

The influence of diagenetic alterations on porosity in the Triassic Narrabeen Group, Southern Sydney Basin, Australia

Gahtani¹

2013

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The in flu ence of diagenetic al ter ations on po ros ity in the Tri as sic Narra been Group, South ern Syd ney Ba sin, Aus tra lia Pe trog ra phy of the Tri as sic Narra been Group (South ern Syd ney Ba sin of Aus tra lia) was de scribed by thin sec tion, scan ning elec tron mi cro scope and X-ray dif frac tion tech niques. Sand stone com po si tion in cludes mostly lithic grains with mi nor quartz, feld spar, mica and heavy min er als; litharenites and sublitharenites are com mon and quartzarenites are rare. Quartz in cludes monocrystalline and polycrystalline grains while the feld spar in cludes both K-feld spar and plagioclase. Vol ca nic, sed i mentary and chert rock frag ments are pres ent. In thin sec tion po ros ity is vis i ble in all units, par tic u larly the coarse-grained de posits. Sec ond ary po ros ity is greater than the pri mary po ros ity. The diagenetic al ter ations in clude com pac tion, quartz overgrowths, authigenic clay min er als, car bon ate ce ment and authigenic feld spar. Com pac tion oc curred in all units dur ing diagenesis. Both early and late diagenetic car bon ate ce ment is im por tant in the Narra been Group. Pore-fill ing car bon ate cement re duced po ros ity whereas dis so lu tion of car bon ate re sulted in sec ond ary po ros ity. Authigenic clay min er als are widespread in all units fill ing pores and oc cur ring as grain-coat ings on de tri tal and authigenic grains. Where they coat quartz grains they pre serve po ros ity by pre vent ing growth of quartz overgrowths. Dis so lu tion of un sta ble feld spar and lithic grains pro vided sec ond ary po ros ity. In the Narra been Group, shale and siltstone are abun dant in the Wom barra Claystone, Stanwell Park Claystone, Bald Hill Claystone and New port For ma tion, form ing lithological seals and con fin ing lay ers. Mi nor sandstone beds oc cur in the Wom barra Claystone and con tain more po ros ity. Me dium-and coarse-grained sand stone is com mon in the Coal cliff Sand stone, Scarborough Sand stone and Bulgo Sand stone and shows low to mod er ate po ros ity. Thus, these sand stone units prob a bly con tain gas or wa ter.Key words: pe trog ra phy, diagenesis, pri mary po ros ity, sec ond ary po ros ity, quartz over growth, car bon ate ce ment. INTRODUCTIONIn the Syd ney Ba sin (Aus tra lia), the Narra been Group is the low er most of three Tri as sic rock units and is lo cated be tween the Up per Perm ian Illa warra Coal Mea sures and the Hawkesbury Sand stone (Ward, 1971a). Fine-grained sed i ment in the Narra been Group was pre vi ously stud ied by sev eral authors (e.g., Baker, 1956;Loughnan et al., 1964Loughnan et al., , 1974Goldbery and Hol land, 1973;Retallack, 1977). Ward (1972) noted quartzose, quartz-lithic and vol ca nic sand stones as the three sed i ment suites in the Narra been Group. Prov e nance mark ers of fore land ba sin-fill sed i ments were de ter mined by Cow an (1993). The com po si tion and tex ture of the Narra been Group were de scribed by McElroy (1954). De scrip tions of the pe trology in the N...

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Quartz cementation mechanisms and porosity variation in Baltic Cambrian sandstones

Cited by 42 publications

References 37 publications

Composition, porosity, and reservoir potential of the Middle Jurassic Kashafrud Formation, northeast Iran

Composition, porosity, and reservoir potential of the Middle Jurassic Kashafrud Formation, northeast Iran

Lack of inhibiting effect of oil emplacement on quartz cementation: Evidence from Cambrian reservoir sandstones, Paleozoic Baltic Basin

The influence of diagenetic alterations on porosity in the Triassic Narrabeen Group, Southern Sydney Basin, Australia

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