Quartz cementation in Late Cretaceous mudstones, northern North Sea: Changes in rock properties due to dissolution of smectite and precipitation of micro-quartz crystals

Thyberg, B.; Jahren, Jens; Winje, T.; Bjørlykke, Knut; Faleide, Jan Inge; Marcussen, Øyvind

doi:10.1016/j.marpetgeo.2009.07.005

Cited by 178 publications

(66 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been suggested that illitization of smectite releases Si and involves addition of K [51,[60][61][62][63]. The excess released Si in solutions (e.g., pore water) may precipitate locally as authigenic micro-crystalline quartz coexisting with the neoformed I/S [62,63].…”

Section: Origin Of the Micro-crystalline Quartz Associated With Mixedmentioning

confidence: 99%

See 1 more Smart Citation

Clay Mineralogy of Coal-Hosted Nb-Zr-REE-Ga Mineralized Beds from Late Permian Strata, Eastern Yunnan, SW China: Implications for Paleotemperature and Origin of the Micro-Quartz

et al. 2016

View full text Add to dashboard Cite

Abstract:The clay mineralogy of pyroclastic Nb(Ta)-Zr(Hf)-REE-Ga mineralization in Late Permian coal-bearing strata from eastern Yunnan Province; southwest China was investigated in this study. Samples from XW and LK drill holes in this area were analyzed using XRD (X-ray diffraction) and SEM (scanning electronic microscope). Results show that clay minerals in the Nb-Zr-REE-Ga mineralized samples are composed of mixed layer illite/smectite (I/S); kaolinite and berthierine. I/S is the major component among the clay assemblages. The source volcanic ashes controlled the modes of occurrence of the clay minerals. Volcanic ash-originated kaolinite and berthierine occur as vermicular and angular particles, respectively. I/S is confined to the matrix and is derived from illitization of smectite which was derived from the original volcanic ashes. Other types of clay minerals including I/S and berthierine precipitated from hydrothermal solutions were found within plant cells; and coexisting with angular berthierine and vermicular kaolinite. Inferred from the fact that most of the I/S is R1 ordered with one case of the R3 I/S; the paleo-diagenetic temperature could be up to 180˝C but mostly 100-160˝C. The micro-crystalline quartz grains (<10 µm) closely associated with I/S were observed under SEM and were most likely the product of desiliconization during illitization of smectite.

show abstract

Section: Origin Of the Micro-crystalline Quartz Associated With Mixedmentioning

confidence: 99%

“…The excess released Si in solutions (e.g., pore water) may precipitate locally as authigenic micro-crystalline quartz coexisting with the neoformed I/S [62,63]. A simplified reaction process would be:…”

Section: Origin Of the Micro-crystalline Quartz Associated With Mixedmentioning

confidence: 99%

Clay Mineralogy of Coal-Hosted Nb-Zr-REE-Ga Mineralized Beds from Late Permian Strata, Eastern Yunnan, SW China: Implications for Paleotemperature and Origin of the Micro-Quartz

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Furthermore, the newly formed microquartz crystals may decrease the size of the pore throats significantly and strongly influence the permeability (Nadeau et al, 2002;Thyberg et al, 2010). In addition, the neoformed illite will be oriented parallel to the bedding (normal to the principal stress axis), decreasing the vertical permeability.…”

Section: Chemical Compactionmentioning

confidence: 99%

“…The illitisation process involves volume changes with the illitisation of smectite ranging from an increase of 4.1% to a decrease of 8.4% volume based on different possible illitisation reactions (Osborne & Swarbrick, 1999). The illitisation process results in an increase of the sonic velocity (Storvoll & Brevik, 2008;Thyberg et al, 2010). Such an increase in Vp (i.e., decrease of sonic transit time) will likely overprint underconsolidation induced overpressure.…”

Section: Maturation Of Organic Mattermentioning

confidence: 99%

“…Similarly, Hermanrud et al (1998) showed that the bulk density and neutron porosity of hydrostatic-pressured and overpressured shale intervals in the Haltenbanken area are not niticeably different. The illitisation process, however, includes dissolution of more porous smectite and precipitation of stiffer I-S and quartz cement (Thyberg et al, 2010) which can cause a notable shift in Vp. Chemical compaction can continue in the overpressured within this cluster (Fig.…”

Section: Maturation Of Organic Mattermentioning

confidence: 99%

See 1 more Smart Citation

Effect of diagenesis on pore pressures in fine-grained rocks in the Egersund Basin, Central North Sea

Kalani¹,

Zadeh²,

Jahren³

et al. 2015

NJG

Self Cite

View full text Add to dashboard Cite

Pore pressure in fine-grained rocks is important with respect to drilling problems such as kicks, blowouts, borehole instability, stuck pipe and lost circulation. In this study, a succession of overpressured, fine-grained, sedimentary rocks located in the Egersund Basin, Central North Sea, was analysed with respect to mineralogical composition, source-rock maturation and log-derived petrophysical properties to highlight the effect of diagenetic processes on the pore pressure. Petrographic and geochemical analyses showed that the overpressure in the study area is largely linked to disequilibrium compaction, illitisation and source-rock maturation shown by log-derived physical properties. Pore-pressure prediction based on the difference of log-derived sonic transit time compared to the normal compaction trend (NCT) of fine-grained rocks can be used to infer the general trends of pore-pressure changes. However, during such pore-pressure prediction (e.g., using Eaton's approach), one should note that with regard to sonic response of the above-mentioned processes, the sonic log-derived, predicted pore pressure in the chemically compacted intervals and organicrich thermally mature successions may show either underestimations or overestimations, respectively.

show abstract

Impact of silica diagenesis on the porosity of fine‐grained strata: An analysis of Cenozoic mudstones from the North Sea

Wrona

Taylor

Jackson

et al. 2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Silica diagenesis has the potential to drastically change the physical and fluid flow properties of its host strata and therefore plays a key role in the development of sedimentary basins. The specific processes involved in silica diagenesis are, however, still poorly explained by existing models. This knowledge gap is addressed by investigating the effect of silica diagenesis on the porosity of Cenozoic mudstones of the North Viking Graben, northern North Sea through a multiple linear regression analysis. First, we identify and quantify the mineralogy of these rocks by scanning electron microscopy and X‐ray diffraction, respectively. Mineral contents and host rock porosity data inferred from wireline data of two exploration wells are then analyzed by multiple linear regressions. This robust statistical analysis reveals that biogenic opal‐A is a significant control and authigenic opal‐CT is a minor influence on the porosity of these rocks. These results suggest that the initial porosity of siliceous mudstones increases with biogenic opal‐A production during deposition and that the porosity reduction during opal‐A/CT transformation results from opal‐A dissolution. These findings advance our understanding of compaction, dewatering, and lithification of siliceous sediments and rocks. Moreover, this study provides a recipe for the derivation of the key controls (e.g., composition) on a rock property (e.g., porosity) that can be applied to a variety of problems in rock physics.

show abstract

Quartz cementation in Late Cretaceous mudstones, northern North Sea: Changes in rock properties due to dissolution of smectite and precipitation of micro-quartz crystals

Cited by 178 publications

References 59 publications

Clay Mineralogy of Coal-Hosted Nb-Zr-REE-Ga Mineralized Beds from Late Permian Strata, Eastern Yunnan, SW China: Implications for Paleotemperature and Origin of the Micro-Quartz

Clay Mineralogy of Coal-Hosted Nb-Zr-REE-Ga Mineralized Beds from Late Permian Strata, Eastern Yunnan, SW China: Implications for Paleotemperature and Origin of the Micro-Quartz

Effect of diagenesis on pore pressures in fine-grained rocks in the Egersund Basin, Central North Sea

Impact of silica diagenesis on the porosity of fine‐grained strata: An analysis of Cenozoic mudstones from the North Sea

Contact Info

Product

Resources

About