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Coupling mechanical properties in porous siliciclastic rocks with diagenetic alterations – a case study on Rotliegend outcrop analogs

Monsees, Alexander C.; Biebricher, Sven F.; Busch, Benjamin ORCID iD icon; Feinendegen, Martin; Ziegler, Martin; Hilgers, Christoph ORCID iD icon

Abstract (englisch):

The detrital composition and the authigenic alterations formed during diagenesis of three sandstone types are related to their mechanical properties. Sandstone samples originating from three studied quarries in Bebertal (Saxony-Anhalt), Cornberg (N Hesse), and Bowscar (NW England) were prepared to cylinders for geotechnical standard tests (rock density, uniaxial compressive strength (UCS), Young’s modulus, strain at failure). Corresponding thin-section across the bedding plane (stained in blue epoxy resin, thickness of 30 µm) were analyzed by optical microscopy, point-counting (300 counts), and clay mineral coverage analyses after Busch et al. (2017) and Monsees et al. (2020).
First results show UCS from 46-62 MPa. Strain at failure ranging from 0.55-0.77% correlates with bulk densities (2.20-2.35 g/cm³). The sandstones were classified as lithic arkoses to litharenites (Bebertal), sublitharenites to quartzarenites (Cornberg), and subarkoses to quartzarenites (Bowscar). The preservation of optical porosity is mostly dependent on the intensity of compaction quantified by the compaction index (Lundegard, 1992), whereas chemical compaction is controlled by the abundance of clay mineral coatings on detrital grain contacts.
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Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Vortrag
Publikationsjahr 2020
Sprache Englisch
Identifikator KITopen-ID: 1000126984
Veranstaltung DGMK/ÖGEW Frühjahrstagung "Shaping the Energy Transitionwith Upstream and Storage Technologies" (2020), Celle, Deutschland, 15.04.2020 – 16.04.2020
Bemerkung zur Veröffentlichung Die Veranstaltung „DGMK/ÖGEW Frühjahrstagung 2020 – Upstream Oil & Gas Talks Climate and the Energy Transition 15.‑16.​04.​2020 “ wurde aufgrund der Corona-Pandemie abgesagt. Konferenz wurde abgesagt, es gibt jedoch einen veröffentlichten Tagungsband.
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