气候变化领域集成服务门户(CCPortal): Quartz Cementation in Polycrystalline Sandstone: Insights From Phase-Field Simulations

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DOI	10.1029/2019JB019137
	Quartz Cementation in Polycrystalline Sandstone: Insights From Phase-Field Simulations
	Prajapati N.; Abad Gonzalez A.; Selzer M.; Nestler B.; Busch B.; Hilgers C.
发表日期	2020
ISSN	21699313
卷号	125 期号:2
英文摘要	Present work investigates the dynamics of polycrystalline quartz cement growth in sandstone using a multiphase-field model. First, the model parameters corresponding to common reservoir temperature and pressure conditions were determined. A parameter related to growth kinetics was ascertained through undisturbed cement growth simulations to aptly capture the known faceting-dependent growth behavior of quartz. Unrestricted growth simulations for different grain sizes, number of subgrains, and their crystallographic orientations revealed that (I) the model successfully recovers the tendency of quartz cements to grow at a faster overall rate on a coarse grain as compared to finer one and (II) the impact of crystallographic orientations of individual subgrains in polycrystalline grains on cement volume increases with increasing number of subgrains. For applying the model to realistic multigrain systems, we generated digital grain packs through a systematic procedure. These packs fairly represent natural sandstone in terms of grain shapes, sizes, and depositional porosity. The simulated textures in these packs resemble natural samples in terms of crystal morphologies and pore geometries. The cement growth rate decreases with the increase in fraction of polycrystalline grains, indicating a significant role of mutual hindrance among differently oriented overgrowths originating from different subgrains. Further, the permeabilities computed using fluid-flow simulations through the progressively cemented packs suggest that monocrystalline packs are more permeable than equally porous polycrystalline ones. The computed permeabilities of the simulated microstructures are consistent with the measured permeabilities, advocating the pack generation process and cementation modeling approach. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	digital grain packs; multiphase-field modeling; permeability; polycrystalline grains; porosity; quartz cementation
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/188005
作者单位	Institute for Applied Materials (IAM-CMS), Karlsruhe Institute of Technology, Karlsruhe, Germany; Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Karlsruhe, Germany; Institute of Applied Geosciences (AGW-SGT), Karlsruhe Institute of Technology, Karlsruhe, Germany
推荐引用方式 GB/T 7714	Prajapati N.,Abad Gonzalez A.,Selzer M.,et al. Quartz Cementation in Polycrystalline Sandstone: Insights From Phase-Field Simulations[J],2020,125(2).
APA	Prajapati N.,Abad Gonzalez A.,Selzer M.,Nestler B.,Busch B.,&Hilgers C..(2020).Quartz Cementation in Polycrystalline Sandstone: Insights From Phase-Field Simulations.Journal of Geophysical Research: Solid Earth,125(2).
MLA	Prajapati N.,et al."Quartz Cementation in Polycrystalline Sandstone: Insights From Phase-Field Simulations".Journal of Geophysical Research: Solid Earth 125.2(2020).