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• Quartz
  | chapter = Grains: Quartz and Silica [[file:M109Quartz300dpi.jpg|300px|thumb|Quartz crystals with adularia (orthoclase) from Dona Ana Co., New Mexico. Photogra
  8 KB (1,127 words) - 20:21, 23 January 2019

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• Quartz
  | chapter = Grains: Quartz and Silica [[file:M109Quartz300dpi.jpg|300px|thumb|Quartz crystals with adularia (orthoclase) from Dona Ana Co., New Mexico. Photogra
  8 KB (1,127 words) - 20:21, 23 January 2019
• Methods for obtaining formation fluid pressures
  ...or the test. Generally two types of gauges measure pressures: strain and [[quartz]]. The table below shows the accuracy and precision of both types. | Quartz Gauge
  2 KB (295 words) - 17:54, 17 February 2022
• Pore systems
  *[[Quartz]]- or carbonate-cemented coarse sandstone *Quartz- or carbonate-cemented fine to medium sandstone
  3 KB (442 words) - 13:52, 4 April 2022
• Sandstone provenance and characterization
  ...by its composition, in Folk and Dott Clasification, we have to know about quartz, feldspar, and rock fragments that compose the sandstone. When we figure it ...more. Based on grain mineralogy, sandstones are divided into three groups: Quartz arenite, feldspathic arenite, dan lithic arenite.
  10 KB (1,524 words) - 15:29, 14 March 2016
• Sandstone diagenesis: composition and texture
  * The higher the [[quartz]] content, the greater the mechanical stability (less compaction occurs). ...secondary porosity through dissolution of less stable grains. The ratio of quartz to [[Ductility|ductile]] grains is key to compaction porosity loss.
  5 KB (729 words) - 20:48, 5 April 2022
• Influence of depositional environment on sandstone diagenesis
  ...gments. Prodelta sands, deposited in a more distal setting, contain fine [[quartz]], micas, and detrital clays that are products of disaggregation. Reworked ...tation. Clay minerals form first because they precipitate more easily than quartz and feldspar overgrowths, which require more ordered crystal growth. Carbon
  8 KB (1,129 words) - 14:11, 6 April 2022
• China Shale Gas & Liquids - Sichuan Basin
  ...res during gas window stage. These organic pores can be preserved by rigid quartz framework during late tectonic movements (Guo et al., 2020). In summary, fo ...ervation conditions. In summary, the combination of high TOC content, high quartz content, high porosity and good gas preservation conditions are fundamental
  7 KB (985 words) - 18:54, 4 December 2023
• Sandstone
  ...of mixtures o a very small number of dominant framework components, like [[quartz]], feldspars, and rock fragments are commonly abundant enough to be importa ===Quartz Arenites===
  10 KB (1,508 words) - 15:44, 22 March 2019
• Sandstone permeability prediction from texture
  ==Effect of [[quartz]] overgrowths== ...te low (<5%) and still have some permeability (<10 md) where cemented with quartz. (See also [[Connectivity and pore throat size]].)
  9 KB (1,118 words) - 17:03, 6 April 2022
• Sandstone diagenetic processes
  * Ferroan carbonate and [[quartz]] cement * Quartz cement (most destructive)
  7 KB (870 words) - 20:30, 5 April 2022
• Predicting sandstone reservoir porosity
  ...Formations on the left side of the plot, like the Vicksburg, tend to be [[quartz]] cemented. Formations on the right side, like the Frio (areas 4-6). tend t * Percentage of [[quartz]] grains
  10 KB (1,384 words) - 15:00, 6 April 2022
• Diagenesis: information from petrology
  ...land) contain fluorescing oil inclusions trapped before the formation of [[quartz]] cements, which degraded the reservoir's quality. From Rick Tobin, unpubli ...land) contain fluorescing oil inclusions trapped before the formation of [[quartz]] cements, which degraded the reservoir's quality. Oil traps could occur [[
  4 KB (544 words) - 21:38, 4 February 2022
• Hydrology and sandstone diagenesis
  ...mical systems close and diagenesis is primarily by pressure solution and [[quartz]] overgrowths.<ref name=ch09r66>Wilson, M. D., 1994a, Non-compositional con | [[Quartz]]
  6 KB (787 words) - 13:43, 6 April 2022
• Reservoir system quality prediction
  | Cement mineralogy || [[Quartz]], [[calcite]], [[dolomite]], [[clay]], and [[anhydrite]], etc. || [[Aragon
  3 KB (425 words) - 17:11, 5 April 2022
• SEM, XRD, CL, and XF methods
  ...chert]]) or polymineral grains (such as granite from separate feldspar and quartz). ...ttice defect structures in [[quartz]] are also thought to cause some CL in quartz.
  11 KB (1,477 words) - 15:25, 24 January 2022
• Botucatu Formation
  ...aeolian sand sheet deposits. It consists mainly of fine to medium-grained quartz sandstones, of red, pink or pale yellow color, well sorted, texturally matu
  3 KB (432 words) - 17:54, 22 March 2019
• Scanning electron microscopy (SEM)
  ...ndicate higher grade metamorphism (phyllite-schist). (b) Detail of a large quartz grain in center of image (arrow) displays multiple generations of growth in ...thodoluminescence can also be used to differentiate between generations of quartz growth that are not distinguishable in SEM due to identical mean atomic num
  16 KB (2,441 words) - 20:24, 23 January 2019
• Hydrodynamic flow and pressure transients
  ...[[North Sea]].<ref name=ch10r64>Robinson, A., J. Gluyas, 1992, Duration of quartz cementation in sandstones, North Sea and Haltenbanken basins: Marine and Pe
  4 KB (477 words) - 14:34, 1 April 2022
• Petrofabrics
  * Onasch, C., M., 1990, Microfractures and their role in deformation of a quartz arenite from the central Appalachian foreland: Journal of Structural Geolog
  4 KB (447 words) - 15:17, 3 February 2022
• Pore and pore throat sizes
  ...systems]] (see [[Reservoir quality]]). Disparate Archie rock types such as quartz-cemented sandstones, [[Bioturbation|bioturbated]] sandstones, and sucrosic
  4 KB (516 words) - 14:04, 4 April 2022
• Sandstone sedimentology and stratigraphy
  ...ng to Dott's (1964) classification scheme, sandstones are classified into: quartz arenite, sublithic arenite, lithic arenite, arkosic arenite and [[arkose]] ...servoir rock in over 60% of the world’s giant fields; composed of mainly [[quartz]] and/or feldspars and typically deposited by relatively high- energy proce
  27 KB (3,802 words) - 19:32, 9 January 2024
• Thin section analysis
  ...rains and [http://dictionary.reference.com/browse/authigenic authigenic] [[quartz]] overgrowths (cement) in sandstones.<ref name=pt05r80>Houseknecht, D. W., ...[[sandstone]]s composed mostly of [[Brittleness|brittle]] grains such as [[quartz]] and [[feldspar]]. Therefore, the preservation of primary [[Reservoir qual
  24 KB (3,264 words) - 15:09, 24 January 2022
• Rock-water reaction
  ...fines that contribute to permeability reduction can be composed of clay, [[quartz]], feldspar, or carbonate. Nonclay fines have no significant surface charge ...lllite Chlorite lllite-smectite Chlorite-smectite Clay size particles of [[quartz]] or other minerals || High transient pressure High flow rates || Perforate
  17 KB (2,356 words) - 19:24, 19 January 2022
• Rock-water reaction: formation damage
  ...fines that contribute to permeability reduction can be composed of clay, [[quartz]], feldspar, or carbonate. Nonclay fines have no significant surface charge ...lllite Chlorite lllite-smectite Chlorite-smectite Clay size particles of [[quartz]] or other minerals || High transient pressure High flow rates || Perforate
  17 KB (2,380 words) - 18:23, 21 January 2022
• Displacement pressure estimation from sedimentary facies and well logs
  ...rectly reflect the relative proportions of clay minerals and organics to [[quartz]] and other minerals. Clay-rich seals with high displacement pressures have
  5 KB (764 words) - 19:46, 31 March 2022
• Formation fluid pressure from repeat formation testers
  # Run quartz and strain gauges simultaneously. Record both readings independently. Norma
  6 KB (849 words) - 17:55, 17 February 2022
• Log analysis: lithology
  ...on the dry clay minerals-100% water line. A shale point was defined on the quartz-wet clay line. The model can then determine porosity, shale volume, and sil ...an be combined to solve for porosity and to estimate volumes of calcite, [[quartz]], dolomite, clay, feldspar, anhydrite, and salt. Once porosity is determin
  25 KB (3,189 words) - 17:24, 18 January 2022
• Reservoir quality
  ...ollapse. A rock that consists of a framework of strong minerals, such as [[quartz]], tends to undergo only minor porosity and permeability reduction during c | [[Quartz]] || Syntaxial overgrowth, prismatic
  18 KB (2,514 words) - 17:47, 21 January 2022
• Quick-look lithology from logs
  | [[Sandstone]] ([[quartz]]) || 15–30 (rarely to 200) [[Quartz]] should read 1.7 to 1.8 barns/electron, but most other minerals can raise
  25 KB (3,637 words) - 19:39, 18 January 2022
• Mudstone nomenclature
  ...00> Schieber, J., D. Krinsley, and L. Riciputi, 2000, Diagenetic origin of quartz silt in mudstones and implications for silica cycling: Nature, v. 406, p. 9 ...grains. Even when overprinting is pervasive, more stable components (e.g., quartz grains) can still be recognized in hand specimens and thin sections, howeve
  58 KB (8,391 words) - 19:46, 20 February 2024
• Bakken and Three Forks Formations, Williston Basin, North Dakota and Montana (USGS)
  | XRD Quartz (wt%) || Variable
  11 KB (1,595 words) - 20:20, 2 June 2021
• Wettability
  ...mulates the reservoir material. For sandstones, glass slides or polished [[quartz]] are often used. Polished marble is usually chosen to simulate a carbonate
  12 KB (1,706 words) - 15:11, 24 January 2022
• Yowlumne field
  * Because sandstones in Unit B have more quartz, less clay, and higher original porosity than the equivalent sandstones in
  13 KB (1,896 words) - 19:02, 11 March 2019
• Depositional environments
  ...oar, 1990). Dune consists of well sorted and well rounded grains, mostly [[quartz]] rich , but also heavy minerals and rock fragments are present. Coastal du ...emains of living things, hemipelagic mud also formed of soft terrigenous [[quartz]], fieldspar mika, mineral lempung, and vilcanin material. Hemipelagic mud
  26 KB (3,851 words) - 20:38, 28 February 2019
• Strain partitioning
  ...uch as micas and more competent (mechanically stronger) minerals such as [[quartz]] or feldspars, may develop a shear band fabric.<ref name=GoodwinTikoff /><
  13 KB (1,732 words) - 22:01, 23 January 2019
• Subduction zone
  ...crystalline [[quartz]], feldspar, and unstable clasts plus polycrystalline quartz. The detail of this classification can be reached in [[:File:Subduction Fig
  27 KB (4,033 words) - 20:52, 27 March 2019
• Wattenberg field
  ...s the clay content increases. Pores are triangular in shape because of the quartz overgrowths. [[:file:M125-WattenbergField-Figure15.jpg|Figure 15]] illustra ...re fine to medium grained, well sorted, and rounded and consist of 57%–80% quartz, 5%–10% rock fragments, and 5% feldspar. Porosity is intergranular with m
  72 KB (10,249 words) - 20:06, 15 January 2024
• Reservoir
  ...hibole, and biotite, or felsic minerals such as feldspar, muscovite, and [[quartz]].<ref> Noor, D., 2009, Pengantar Geologi, Universitas Pakuan Bogor.</ref>
  14 KB (2,134 words) - 16:48, 26 March 2019
• Ti in zircon geothermometer
  ...con in Earth's crust. In some zircon crystals, inclusions of the mineral [[quartz]] (SiO₂) can be used as proof that silicon was present during cr
  16 KB (2,328 words) - 22:11, 3 December 2015
• Silurian Qusaiba shales
  ...to be tight due to advanced [[diagenesis]], particularly cementation by [[quartz]] overgrowths, which has reduced reservoir quality.
  18 KB (2,569 words) - 22:50, 8 January 2019
• Influence of mechanical stratigraphy on deformation styles
  ...Additionally, the lower part of the formation is highly fractured with low quartz cementation content, high Young’s modulus, and low Poisson’s ratio. Bot
  23 KB (3,162 words) - 17:28, 5 December 2023
• Vaca Muerta play
  ...in. Cements are mainly represented by calcite, dolomite, and microgranular quartz<ref name=Ktzmn>Kietzmann D. A., F. González Tomassini, and T. Smith, 2020, ...ments, silt-size quartz, and plagioclase grains; cements are microgranular quartz and granular calcite; mineralogy records 45% siliciclastic, 30% carbonate,
  77 KB (11,201 words) - 20:07, 15 January 2024
• Fluid inclusions: analysis and applications
  ...proach to measure the frequency of hydrocarbon inclusions contained within quartz grains in order to identify zones of paleo-oil saturation.<ref name=Volkand
  20 KB (2,691 words) - 21:06, 21 April 2022
• Reservoir fluids
  ...fore oil migration started; the major mineral phases in reservoirs such as quartz, carbonate and [[dolomite]] are all water wetting prior to coming in contac
  22 KB (3,508 words) - 20:34, 3 March 2016
• Capillary pressure
  ''<small>* Contact angle is measured on a [[quartz]] plane during drainage</small>''
  23 KB (3,315 words) - 16:59, 19 January 2022
• Shale-oil resource systems
  ...because of their contribution to rock [[brittleness]]. Derivation of this quartz has largely been from biogenic sources instead of detrital, meaning it is c ...e oil reservoir suggests that the organic-rich mudstone with high clay and quartz content and low carbonate content inhibits production of oil because of its
  97 KB (14,873 words) - 19:53, 11 January 2024
• Paraná Basin
  ...a Formations. The Furnas Formation is represented by a succession of white quartz sandstones, medium to coarse, with high kaolinite content and displaying cr
  22 KB (3,382 words) - 19:52, 4 January 2024
• Cuba: Geologic history
  There was an influx of [[quartz]]- and mica-rich [[Turbidite|turbiditic]] [http://dictionary.reference.com/
  30 KB (4,263 words) - 22:00, 23 January 2019
• Diagenetically complex reservoir evaluation
  ...(for example, sandstones that are dolomite cemented, anhydrite cemented, [[quartz]]-overgrowth cemented, or argillaceous).
  31 KB (4,171 words) - 18:22, 21 January 2022
• Medical geology
  ...dust causes allergic aveolitis. Organic dust may contain minerals such as quartz, feldspar and mica produced as a result of the abrasion action of the wind. ...of silica cause silicosis. The dangerous types are the crystalline forms –quartz, chrystobalite and tridymite. They cause illnesses such as nodular pulmonar
  83 KB (12,860 words) - 14:03, 10 April 2019

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