Chlorite in sandstones

Worden, Richard H.; Griffiths, Joshua; Wooldridge, Luke J.; Utley, James E. P.; Lawan, Auwala Yola; Muhammed, Dahiru; Simon, Naboth; Armitage, Peter

doi:10.1016/j.earscirev.2020.103105

Cited by 152 publications

(109 citation statements)

References 140 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, the volume fraction of iron and magnesium in volcanic debris and plastic debris (mainly mica, slate and phyllite) in the sandstone deposits is over 10%, and the hydrolyzation and dissolution during the depositional stage have also provided the material source for the formation of grain-coating chlorite (Yao et al., 2011). Biotite and chlorite have similar crystal structures, chlorite grows directly on the detrital biotite, allowing easy identification of alteration process (Worden et al., 2020). As shown in Figure 8(a), the chloritization of biotite during the process of rock formation was obviously in this study area.…”

Section: Discussionmentioning

confidence: 99%

“…Due to the above reasons, the iron content of the pore fluids within the sandstone increased continuously. When the high content of iron and magnesium ion in the pore fluid reached a certain level, chlorite was precipitated from the alkaline pore water (Worden et al., 2020). As shown in Figure 8(b), the chloritization of feldspar also occurred in the study area, which may be related to the dissolution of feldspar.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, chlorite is an important product of diagenesis, and is significant for the formation of high-quality reservoirs (Ehrenberg, 1993; Zhu et al., 2017). Therefore, it is very important to systematically study the occurrence states and formation mechanism of chlorite.Chlorite is a specific type of clay mineral, with typically high content of iron and magnesium (Worden et al., 2020). The chlorite is well developed at low temperature, prograde metamorphic rocks, in retrograde alteration products of ferroan metamorphic minerals, being a low-temperature alteration product of biotite in acid igneous rocks and a hydrolysis alteration product (Worden et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is very important to systematically study the occurrence states and formation mechanism of chlorite.Chlorite is a specific type of clay mineral, with typically high content of iron and magnesium (Worden et al., 2020). The chlorite is well developed at low temperature, prograde metamorphic rocks, in retrograde alteration products of ferroan metamorphic minerals, being a low-temperature alteration product of biotite in acid igneous rocks and a hydrolysis alteration product (Worden et al., 2020). Chlorite is an important constituent of fine-grained sediments deposited in both marine and continental environments.…”

Section: Introductionmentioning

confidence: 99%

“…Chlorite is an important constituent of fine-grained sediments deposited in both marine and continental environments. Significantly, chlorite is also an important clay mineral in coarse-grained clastic sediments such as sandstones, especially in the lacustrine sandstone reservoirs (Worden et al., 2020). As an important anti-compaction mineral in sandstones, chlorite has attracted widespread attention for more than 50 years (Huang et al., 2004; Tian et al., 2008; Worden et al., 2020; Yao et al., 2011; Zhou et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Formation mechanism of authigenic chlorite in tight sandstone and its influence on tight oil adsorption, Triassic Ordos Basin, China

Zhou

et al. 2020

Energy Exploration & Exploitation

View full text Add to dashboard Cite

In this study, the formation mechanism of authigenic chlorite in tight reservoirs and its influence on the adsorption capacity to tight oil have been analyzed. The occurrence states of chlorite and the formation mechanism have been analyzed by thin section (TS) and field emission scanning electron microscopy (FE-SEM) measurements. Due to the alteration of volcanic rock fragments, the mudstone pressurized water, and the dissolution of early chlorite, the material source has been provided for the formation of chlorite. The formation time of chlorite with different occurrence states is in the following order: grain-coating chlorite → pore-lining chlorite → pore-lining chlorite in dissolved pores → rosette chlorite. Authigenic chlorite developed in the reservoirs has influenced the change of the reservoir quality in two respects. On the one hand, authigenic chlorite can protect the residual pores, improve the anti-compaction capacity of the reservoir, and provide certain inter-crystalline space. On the other hand, it can hinder pore space and inhibit throat, resulting in a decrease in the connectivity of pores and the increase in the heterogeneity of the reservoir. Tight oil absorbed by the chlorite is mainly in the form of the thin film and aggregates. Through in situ testing of environmental scanning electron microscope (ESEM) and energy dispersive spectrum (EDS), the adsorption capacity of chlorite with different occurrence states to tight oil, being in the following order: rosette chlorite > pore-lining chlorite > pore-lining chlorite in dissolved pores > grain-coating chlorite. Furthermore, the controlling factors on reservoir quality, the content of chlorite and content of Fe and K have been investigated, and the adsorption capacity of different chlorite types has been studied, which can provide guidance for analysis of the control factors on the difference in adsorption capacity of different occurrence states of chlorite to tight oil in tight reservoirs.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Formation mechanism of authigenic chlorite in tight sandstone and its influence on tight oil adsorption, Triassic Ordos Basin, China

Zhou

et al. 2020

Energy Exploration & Exploitation

View full text Add to dashboard Cite

show abstract

Clay mineral diagenesis in alternating mudstone‐sandstone beds from Late Palaeozoic strata of the Anadarko Basin, United States

2022

View full text Add to dashboard Cite

Closely interbedded mudstone and sandstone are rarely the focus of clay mineral diagenetic studies; as such, it is not understood if these various rock types follow the same or different diagenetic pathway(s) during burial. Over a depth span of $2,300 to 4,200 m, 95 core samples of alternating Pennsylvanian mudstone/sandstone from the hydrocarbon-rich Anadarko Basin in Oklahoma have been characterized petrographically, mineralogically, and chemically. The investigated fine-grained sediment is argillaceous to siliceous mudstone, dominated by Illite/mica and mixed-layer illitesmectite. The sandstone is variably classified as quartz and mudclast-rich litharenite to sub-litharenite, which is commonly carbonate-cemented. This contribution provides evidence for a very similar diagenetic evolution of the clay mineral assemblages across all rock types despite the discrepancies in porosity and permeability of the host rock. We posit that the incorporation of micrometre-scale mudclasts through bioturbation of the sandstone may explain the relatively uniform compositional characteristics of illite-smectite, chlorite, and kaolinite. Inferences are drawn from a detailed clay mineral quantification of these interbedded lithologies aid to our understanding of the clay mineral distribution and speciation in Pennsylvanian strata of the Anadarko Basin, which further helps to constrain the reservoirs' physical, chemical, and structural properties.

show abstract

Hinterland environments of the Late Jurassic northern Weald Basin, England

Barshep

Worden

2023

Geological Journal

View full text Add to dashboard Cite

Reconstructing provenance in sandstones can be challenging, especially when the hinterland palaeogeology is unknown due to burial, diagenesis or weathering of the original outcrops. As sedimentary processes alter the distribution of minerals in the depositional environment, the use of multiple provenance methods reduces uncertainties, because, together, they can account for depositionally‐controlled textural and mineralogical re‐distribution in a basin. Here, we have applied petrography, X‐ray fluorescence geochemistry and sedimentology to understand the provenance of shallow marine Corallian sandstones with the aim of deducing the palaeogeology, palaeoenvironment and sediment distribution within the northern parts of the Upper Jurassic Weald Basin, onshore UK. The Corallian sandstones had a mixed mafic‐felsic (intermediate), metasedimentary recycled orogen source. The hinterland experienced significant physical and chemical weathering under humid conditions. Corallian sandstones were relatively more chemically mature up‐dip and more texturally mature down‐dip. Chemically unstable grains and heavy minerals were relatively concentrated down‐dip. Heterogeneous, sedimentologically‐controlled mineral distribution patterns highlight potential errors which may be made in deriving source‐area maturity. This study is significant as it illustrates the combined roles of provenance and deposition in controlling primary mineral distribution that then influenced the style of burial diagenesis. The work presented here emphasizes the importance of a multi‐proxy approach to improve provenance analysis.

show abstract

Chlorite in sandstones

Cited by 152 publications

References 140 publications

Formation mechanism of authigenic chlorite in tight sandstone and its influence on tight oil adsorption, Triassic Ordos Basin, China

Formation mechanism of authigenic chlorite in tight sandstone and its influence on tight oil adsorption, Triassic Ordos Basin, China

Clay mineral diagenesis in alternating mudstone‐sandstone beds from Late Palaeozoic strata of the Anadarko Basin, United States

Hinterland environments of the Late Jurassic northern Weald Basin, England

Contact Info

Product

Resources

About