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Three-Dimensional Phase-Field Investigation of Pore Space Cementation and Permeability in Quartz Sandstone

Prajapati, Nishant; Selzer, Michael; Nestler, Britta; Busch, Benjamin; Hilgers, Christoph; Ankit, Kumar

The present work investigates the dynamics of quartz precipitation from supersaturated formation fluids in granular media, analogous to sandstones, using a multiphase‐field model. First, we derive a two‐dimensional (2‐D) Wulff shape of quartz from the three‐dimensional (3‐D) geometry and simulate the unitaxial growth of quartz in geological fractures in 2‐D in order to examine the role of misorientation and crystal c to a axis ratios (c/a) in the formation of quartz bridge structures that are extensively observed in nature. Based on this sensitivity analysis and the previously reported experiments, we choose a realistic value of c/a to computationally mimic the 3‐D anisotropic sealing of pore space in sandstone. The simulated microstructures exhibit similarities related to crystal morphologies and remaining pore space with those observed in natural samples. Further, the phase‐field simulations successfully capture the effect of grain size on (I) development of euhedral form and (II) sealing kinetics of cementation, consistent with experiments. Moreover, the initially imposed normal distribution of pore sizes evolves eventually to a lognormal pattern exhibiting a bimodal behavior in the intermediate stages. ... mehr

DOI: 10.1029/2018JB015618
Zitationen: 4
Web of Science
Zitationen: 5
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2169-9313
KITopen-ID: 1000088576
HGF-Programm 35.14 (POF III, LK 01) Geothermische Technologie
Erschienen in Journal of geophysical research / Solid earth
Verlag Wiley
Band 123
Heft 8
Seiten 6378-6396
Vorab online veröffentlicht am 11.08.2018
Nachgewiesen in Web of Science
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