A review of feldspar alteration and its geological significance in sedimentary basins: From shallow aquifers to deep hydrocarbon reservoirs

Yuan, Guanghui; Cao, Yingchang; Schulz, Hans-Martin; Hao, Fang; Gluyas, Jon; Liu, Keyu; Yang, Tian; Wang, Yanzhong; Xi, Kelai; Li, Fulai

doi:10.1016/j.earscirev.2019.02.004

Cited by 188 publications

(72 citation statements)

References 162 publications

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“…The dotted line in e) indicates the equilibrium phase boundary of the k-feldspar dissolution to kaolinite. Huang et al reported that temperature influences the feldspar dissolution equilibrium in all systems, but pressure does not[36], thus the equilibrium phase boundary plotted at 0.1 MP can be acceptable in this study.…”

mentioning

confidence: 58%

“…These results show that feldspar dissolution leads to the considerable enrichment of Na and slight enrichment of K in formation water. Yuan et al reported that K in the fluid makes the Gibbs free energy change (ΔG) of feldspar illitization less than that of feldspar kaolinization [36]. Thus, from the perspective of thermodynamics, illite would be preferentially precipitated.…”

Section: Kaolinization and Illitization Of Feldsparmentioning

confidence: 99%

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Origin and Geochemical Evolution of Formation Water in the Dameigou Shale Gas Reservoir in Northern Qaidam Basin

Cui¹,

Zheng²,

Zhu³

et al. 2020

Pol. J. Environ. Stud.

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The origin and geochemical evolution of formation water trapped in continental shale of the Dameigou Formation in the Northern Qaidam Basin have been investigated for selecting unique signatures of formation water compared with shallow groundwater and conventional oilfield brines (COB). The formation water, which is trapped in a closed shale with no halite and sylvite in it, has a higher Cl/Br ratio (1183.43) than that of seawater (657.89). Furthermore, δ 2 H (−67‰) and δ 18 O (−8.1‰) values of the formation water lies near the local evaporation line. These suggest that the formation water originated from evaporated rainwater. The temperature (>120°C) of the Dameigou Formation and the vitrinite reflectance values (1.0-1.3%) of the shale indicate that thermochemical sulfate reduction (TSR) was responsible for the depletion of SO 4 in the formation water. The increased CO 2 concentration and Mg/Ca ratio in formation water leading by TSR caused kaolinization of plagioclase feldspar and dolomitization, respectively. The formation water depletion in Ca and HCO 3 was caused mainly by calcitization. The Na/Ba ion exchange and dissolution of continental borate occurring in the shale-formation water system were vital to the geochemistry of trace elements in formation water. All these geochemical processes have given the formation water distinctive δ 34 S-H 2 S (25.9‰), 87 Sr/ 86 Sr ratio (0.713842), Ba/Ca ratio (2.60×10 -2 ) and δ 11 B (1.1‰) signatures compared with COB in shallow groundwater.

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mentioning

confidence: 58%

Section: Kaolinization and Illitization Of Feldsparmentioning

confidence: 99%

Origin and Geochemical Evolution of Formation Water in the Dameigou Shale Gas Reservoir in Northern Qaidam Basin

Cui¹,

Zheng²,

Zhu³

et al. 2020

Pol. J. Environ. Stud.

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“…A comparison of grain size data showed that quantities of clay minerals, biogenic silica contents, and REE distributional patterns, as well as the early diagenetic immobilization of metals such as REE, Ni, Cu, Co, or Zn, could also be related to the presence of micronodules. In the lower sediment depths, the feldspars content showed a positive relationship with clay minerals, especially illite and smectite, which may be an indicator of burial alteration and plagioclase decomposition processes [88]. REE related to feldspars or other allogenic debris components may be an additional source of Y or HREE, mostly in the deeper parts of sediment column.…”

Section: Discussionmentioning

confidence: 93%

Fractionation Trends and Variability of Rare Earth Elements and Selected Critical Metals in Pelagic Sediment from Abyssal Basin of NE Pacific (Clarion-Clipperton Fracture Zone)

et al. 2020

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The geochemical and mineralogical characteristics of pelagic sediments collected from the Interoceanmetal Joint Organization (IOM) claim area, located in the eastern part of the Clarion-Clipperton Fracture Zone (CCFZ; eastern tropical Pacific), are described in this paper. The concentrations of rare earth elements (REE), as well as other selected critical elements contained in 135 sediment samples of siliceous clayey silts, are presented. The vertical and spatial variabilities of elements, with particular emphasis on REE as well as metals of the highest economic interest such as Cu, Ni, and Co, are detailed. The applied methods include grain size analysis by laser diffraction, geochemistry examination using ICP-MS, XRF, AAS, and CNS spectrometry, and XRD analysis of mineral composition (Rietveld method). Additionally, statistical methods such as factor analysis (FA) and principal components analysis (PCA) were applied to the results. Finally, a series of maps was prepared by geostatistical methods (universal kriging). Grain size analysis showed poor sorting of the examined fine-grained silts. ICP-MS indicated that total REE contents varied from 200 to 577 ppm, with a mean of 285 ppm, which is generally low. The contents of critical metals such as Cu, Ni, and Co were also low to moderate, apart from some individual sampling stations where total contents were 0.15% or more. Metal composition in sediments was dominated by Cu, Ni, and Zn. A mineral composition analysis revealed the dominance of amorphous biogenic opaline silica (27–58%), which were mostly remnants of diatoms, radiolarians, and sponges associated with clay minerals (23% to 48%), mostly Fe-smectite and illite, with mixed-layered illite/smectite. The high abundance of diagenetic barite crystals found in SEM−EDX observations explains the high content of Ba (up to 2.4%). The sediments showed complex lateral and horizontal fractionation trends for REE and critical metals, caused mostly by clay components, early diagenetic processes, admixtures of allogenic detrital minerals, or scavenging by micronodules.

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“…A concentração de gel, juntamente com a neoformação de ilita, podem ser indicativos de um processo de dissolução incongruente e de um tipo específico de mecanismo de dissolução que ocorre em feldspatos. Yuan et al (2019) realizaram um compilado de trabalhos a respeito dos quatro mecanismos de dissolução que ocorrem no grupo dos feldspatos, sendo: 1) mecanismo de dissolução controlado por reação superficial (LAGACHE et al, 1961a;LAGACHE et al, 1961b; BERNER e HOLDREN, 1979); 2) mecanismo controlado de lixiviação-difusão preferencial (CORRENS e VON, 1938;CORRENS, 1940;CHOU e WOLLAST, 1984;HELLMANN, 1994;OELKERS e SCHOTT, 1995;GOUT et al, 1997;CHARDON et al, 2006); 3) mecanismo de dissolução-reprecipitação interfacial (HELLMANN et al, 2003;HELLMANN et al, 2012;RUIZ-AGUDO et al, 2012;PUTNIS, 2014;HELLMANN et al, 2015;RUIZ-AGUDO et al, 2016); e 4) mecanismo de dissolução controlada por precipitação-difusão (WOLLAST, 1967;HELGESON, 1971;HELGESON, 1972). Outros ensaios seriam necessários para afirmar qual(is) mecanismo(s) de dissolução está(ão) ocorrendo neste K-feldspato.…”

Section: Feldspato Pouco Alteradounclassified

“…57). As mudanças físicas citadas são importantes para molhabilidade e permeabilidade do grão (YUAN et. al., 2019), já que tais feições acarretam em maior acúmulo de moléculas de água.…”

Section: Feldspato Com Alteração Amarelaunclassified

Mineralogia do Granito Itaocá e sua relação com a suscetibilidade a escorregamentos rasos da bacia do Rio Gurutuba

Carou¹

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Só quem desenvolve uma pesquisa de mestrado ou doutorado sabe o quanto esse caminho é tortuoso, árduo e solitário, ainda mais em um cenário nacional que não valoriza a ciência. Mas muitas vezes encontramos pessoas que, direta ou indiretamente, contribuem com nosso crescimento pessoal e profissional, tornando esse caminho um pouco mais leve. Primeiramente gostaria de agradecer às minhas orientadoras, Profa.

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A review of feldspar alteration and its geological significance in sedimentary basins: From shallow aquifers to deep hydrocarbon reservoirs

Cited by 188 publications

References 162 publications

Origin and Geochemical Evolution of Formation Water in the Dameigou Shale Gas Reservoir in Northern Qaidam Basin

Origin and Geochemical Evolution of Formation Water in the Dameigou Shale Gas Reservoir in Northern Qaidam Basin

Fractionation Trends and Variability of Rare Earth Elements and Selected Critical Metals in Pelagic Sediment from Abyssal Basin of NE Pacific (Clarion-Clipperton Fracture Zone)

Mineralogia do Granito Itaocá e sua relação com a suscetibilidade a escorregamentos rasos da bacia do Rio Gurutuba

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