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Coupling of diagenetic alterations and mechanical properties of Lower Permian siliciclastic sandstones: a pilot study

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

Abstract (englisch):
Initial detrital composition and authigenic alterations during diagenesis of three sandstone types are related to their mechanical properties. Sandstones were prepared for geotechnical standard tests [density, uniaxial compressive strength (UCS), Young’s modulus (E), strain at failure (ε)] and thin sections for petrographic analyses (point counting). UCS ranges from 3 to 62 MPa and positively correlates with density (1.75–2.35 g/cm3) and E (0.3–12.7 GPa). Optical porosity is controlling these mechanical parameters and was linked to diagenetic alterations. Diagenetic alterations affecting porosity reduction are the abundance of clay minerals, and the intensity of mechanical and chemical compaction. The latter is controlled by clay mineral coatings on contacts between detrital grains, and the occurrence of authigenic quartz and dolomite. Horizontal contact lengths of grains normalized to their respective particle diameter (effective contact ratio, ECR) and porosity are identified as a control on the mechanical properties UCS and E, reflected by the rock strength index SR. The results of this pilot study suggest that SR is able to predict UCS and E based on petrographic information obtained from the studied samples. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129502
Veröffentlicht am 09.02.2021
Originalveröffentlichung
DOI: 10.1007/s12665-021-09376-1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2021
Sprache Englisch
Identifikator ISSN: 1866-6280, 1866-6299
KITopen-ID: 1000129502
Erschienen in Environmental earth sciences
Verlag Springer
Band 80
Heft 4
Seiten Article no: 141
Vorab online veröffentlicht am 07.02.2021
Schlagwörter Sandstone, Rotliegend, Diagenetic porosity modification, Rock strength
Nachgewiesen in Dimensions
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