Clay mineral transformation as a major source for authigenic quartz in thermo-mature gas shale

Metwally, Yasser; Chesnokov, Evgeni M.

doi:10.1016/j.clay.2011.11.007

Cited by 115 publications

(48 citation statements)

References 30 publications

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“…This phenomenon is consistent with clay minerals dominated by mixed layers C/S in E 3 d 1+2 (Figure 8), which can be interpreted as strong hydration and hydrolysis of tuff and eruptive rock detritus precipitated voluminous authigenic smectite at an early diagenesis stage [46][47][48]. Smectite can easily transform to mixed-layer I/S or discrete illite with increasing temperature where a potassium source exist ( [49][50][51][52]; Cama et al 2000). Meanwhile, the conversion of smectite to mixed-layer C/S occurred where aqueous medium environments were enriched in magnesium.…”

Section: Ferromagnesian Aqueous Medium Environmentsupporting

confidence: 65%

Pore Fluid Evolution Influenced by Volcanic Activities and Related Diagenetic Processes in a Rift Basin: Evidence from the Paleogene Medium-Deep Reservoirs of Huanghekou Sag, Bohai Bay Basin, China

Sun

Zhu

et al. 2017

Geofluids

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Volcanic activities exert a significant influence on pore fluid property and related diagenetic processes that substantially controlled reservoirs quality. Analysis of Paleogene medium-deep sandstones on the Huanghekou Sag provides insight into relating the diagenetic processes to pore fluid property evolution influenced by volcanic activities. Three distinct types of pore fluids were identified on the basis of an integrated and systematic analysis including core and thin section observation, XRD, SEM, CL, and trace element. Alkaline aqueous medium environment occurred in E2s1+2 where volcanic activities have insignificant influence on pore fluids, evidenced by typical alkaline diagenetic events such as K-feldspar albitization, quartz dissolution, feldspar dissolution, and carbonate cementation. During the deposition of E3d3, influx of terrestrial freshwater and alteration of ferromagnesian-rich pore water result in the formation of mixing aqueous medium environment through volcanic eruption dormancy causing zeolite dissolution, clay mineral transformation, and K-feldspar albitization. Ferromagnesian-rich aqueous medium environment developed resulting from the intensive hydrolysis of the unstable ferromagnesian minerals formed due to intense volcanic activities during E3d1+2 and corresponding predominant diagenetic processes were characterized by the precipitation and dissolution of low-silica zeolites. Therefore, the differential properties of pore fluids caused various diagenetic processes controlling reservoir quality.

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Section: Ferromagnesian Aqueous Medium Environmentsupporting

confidence: 65%

Pore Fluid Evolution Influenced by Volcanic Activities and Related Diagenetic Processes in a Rift Basin: Evidence from the Paleogene Medium-Deep Reservoirs of Huanghekou Sag, Bohai Bay Basin, China

Sun

Zhu

et al. 2017

Geofluids

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“…Diagenesis of clay minerals mainly includes the dehydration and microstructural change (such as reduction of interplanar spacing) [43,44], resulting in an obvious decrease of the porosity [41,42], as well as the transformation of mineral type (typically smectite to illite through a mixed-layer illite-smectite) [45][46][47][48]. This transformation of clay mineral types exists in normal geological environments [45,46] and also happens under strictly controlled laboratory conditions [47,48]. However, it does not occur under the experimental conditions of this study ( Table 2).…”

Section: Response Of Pore Structure Parameters To Thermal Maturitymentioning

confidence: 99%

Evolution of nanoporosity in organic-rich shales during thermal maturation

Chen

Xiao

2014

Fuel

340

186

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“…The Shanxi Formation tight sandstones contain abundant volcanic rock fragments according to the petrologic analysis; thus, it can be inferred that the sandstone was rich in smectite during the early stage of diagenesis, providing favourable condition for the formation of authigenic quartz at high temperature. The transformation of smectite into quartz typically occurs when the temperature is around 70°C (Metwally & Chesnokov, ; Peltonen et al, ) and can be expressed using the following reaction:

1 . {5Al}_{2} {Si}_{4} O_{10} {(OH)}_{2} + K^{+} \to {KAl}_{3} {Si}_{3} O_{10} {(OH)}_{2} + {3SiO}_{2} + H^{+} .

…”

Section: Discussionmentioning

confidence: 99%

Diagenetic characteristics and reservoir quality in tight gas sandstones: A case study of the Shanxi Formation in the north‐eastern Ordos Basin, China

et al. 2018

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Reservoir quality is critical in tight gas exploration. A systematic study of the petrological, petrophysical, and diagenetic characteristics of the Shanxi Formation sandstones in the north‐eastern Ordos Basin (China) was undertaken to characterize the pore system of these tight sandstones and recognize the distribution of reservoirs favourable for hydrocarbon accumulation. The results suggest that the Shanxi Formation sandstone has low compositional and moderate textural maturity, with its porosity ranging from 0.7% to 11.8% (average 5.97%) and permeability ranging from 0.001 to 2.77 mD (average 0.36 mD). In addition, thin section and SEM observations suggest that the sandstone is dominated by secondary dissolution pores, primary intergranular pores as well as microfractures, and has undergone compaction, cementation, and dissolution. Diagenetic minerals, such as carbonate cements, authigenic quartz, clay minerals, and dissolved feldspar, are identified. Fluid inclusions are observed in healed microfractures of quartz grains and in quartz overgrowths, while the homogenization temperatures of fluid inclusions in healed microfractures and in quartz overgrowth are in the ranges of 92.8–179.1°C (average 134.8°C) and 104.7–169.1°C (average 145.7°C), respectively. Authigenic kaolinite is sourced from the process of K‐feldspar dissolution, authigenic illite is sourced from transformation of smectite and kaolinite, while sources for quartz cements include mineral alteration and pressure dissolution. Selective dissolution of K‐feldspar in the presence of carbonate minerals is observed in the Shanxi Formation tight sandstones due to the different equilibrium constants of carbonate minerals and K‐feldspar leaching, resulting in dissolution pores associated with K‐feldspar. Reservoir quality in the Shanxi Formation tight sandstones is greatly influenced by diagenesis, as compaction and cementation are responsible for the loss of porosity while dissolution accounts for the enhancement of secondary porosity.

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Clay mineral transformation as a major source for authigenic quartz in thermo-mature gas shale

Cited by 115 publications

References 30 publications

Pore Fluid Evolution Influenced by Volcanic Activities and Related Diagenetic Processes in a Rift Basin: Evidence from the Paleogene Medium-Deep Reservoirs of Huanghekou Sag, Bohai Bay Basin, China

Pore Fluid Evolution Influenced by Volcanic Activities and Related Diagenetic Processes in a Rift Basin: Evidence from the Paleogene Medium-Deep Reservoirs of Huanghekou Sag, Bohai Bay Basin, China

Evolution of nanoporosity in organic-rich shales during thermal maturation

Diagenetic characteristics and reservoir quality in tight gas sandstones: A case study of the Shanxi Formation in the north‐eastern Ordos Basin, China

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