Abstract
Detrital Clay Coats, Clay Minerals, and Pyrite: A Modern Shallow-Core Analogue For Ancient and Deeply Buried Estuarine Sandstones
Highlights
Clay minerals can significantly impact the petrophysical properties of sandstone reservoirs
Following the Kruskal-Wallis H test, a post-hoc Dunn test was employed to highlight where the identified significant differences occurred in detrital-clay-coat coverage between individual facies
Pearson’s correlation coefficients were calculated to describe the strength of the relationship between clay-fraction abundance and core depth, to assess whether there is any evidence for a postdepositional increase in clay content, which might be due to mechanical infiltration
Summary
Clay minerals can significantly impact the petrophysical properties (e.g., porosity, permeability, and water saturation) of sandstone reservoirs. 80 to 100 8C), can be inhibited by authigenic chlorite clay coats (Ehrenberg 1993; Stricker et al 2016; Skarpeid et al 2017), while some clay minerals (e.g., illite) can plug pore throats and promote chemical compaction and subsequent quartz cementation (Oelkers et al 1996; Worden and Morad 2003; Worden et al 2018). Authigenic clay coats in sandstones have been reported to originate from (i) the thermally driven recrystallization of lowtemperature, precursor (before burial) detrital clay coats, and (ii) through in situ growth from the authigenic alteration of precursor and early-diagenetic minerals, which interact with pore fluids during burial (Hillier 1994; Aagaard et al 2000; Worden and Morad 2003; Ajdukiewicz and Larese 2012). Pyrite and siderite grow much more quickly than the Fe-silicate clay minerals (such as chlorite), so that, if there is competition at any one time, pyrite or siderite will preferentially grow at the expense of authigenic chlorite (Worden and Morad 2003)
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