Modeling fracture cementation processes in calcite limestone: a phase-field study

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

doi:10.1186/s40517-018-0093-4

Cited by 24 publications

(25 citation statements)

References 42 publications

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“…The function a kin (q ) introduces anisotropy in the interface mobility accounting for the direction-dependent attachment kinetics and is elaborated in section 2.2.1.4. Several past works (e.g., Ankit et al, 2013;Ankit, Urai, et al, 2015;Ankit, Selzer, et al, 2015;Prajapati et al, 2017Prajapati et al, , 2018aPrajapati et al, , 2018b) employed a simple interpolation of the inverse mobilities (i.e.,…”

Section: Multiphase-field Modelmentioning

confidence: 99%

“…In the past decade, the phase-field method has established itself as a viable alternative for simulating mineral growth in 2-D and 3-D (Ankit et al, 2013;Ankit, Urai, et al, 2015;Ankit, Selzer, et al, 2015;Prajapati et al, 2017Prajapati et al, , 2018aPrajapati et al, , 2018bWendler et al, 2011Wendler et al, , 2016. In contrast to the aforementioned front tracking models that were based on the sharp interface approach, the phase-field models describe interfaces as diffuse regions.…”

Section: Introductionmentioning

confidence: 99%

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Quartz Cementation in Polycrystalline Sandstone: Insights From Phase‐Field Simulations

et al. 2020

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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.

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Section: Multiphase-field Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quartz Cementation in Polycrystalline Sandstone: Insights From Phase‐Field Simulations

et al. 2020

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“…The BCVs identified in the present study have elongate-blocky textures which reveal a moderate crack opening rate according to Prajapati et al (2018). Elongate-blocky crystals demonstrate preferred orientations at the final phase of growth, indicating the presence of growth competition during vein development (Hilgers & Urai 2002;Prajapati et al 2018).…”

Section: Formation Mechanisms Of Bitumen-bearing Fracturesmentioning

confidence: 60%

Genesis and role of bitumen in fracture development during early catagenesis

Abu-Mahfouz

Cartwright

Idiz

et al. 2019

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Bitumen-bearing fractures and vugs were investigated in the highly organic-rich Jordan Oil Shale (JOS) of Late Cretaceous to Eocene age, which has potential as a highly fractured, unconventional hydrocarbon play. Bitumen is present as macroscopically visible deposits and as inclusions in the cement of abundant natural fractures and adjacent vugs. The frequency of bitumen occurrence in fractures closely correlates with Total Organic Carbon (TOC) and burial depth. Petrographic and organicgeochemical analyses on bitumen samples extracted from fractures and their host rock matrix show that the fracture-filling bitumen comprises indigenous low maturity hydrocarbons derived from the surrounding organic-rich Oil Shale and has not migrated from a deeper source. Maturity indicators imply that the oil shale is in the pre-oil generation stage of early catagenesis throughout the investigated area, but with a regional increase in thermal maturity from west to east as the result of greater maximum burial depth. Bitumen mobilization in the host rock was mainly controlled by vertical loading stress acting on the non-Newtonian bitumen phase in load bearing configurations in the organic-rich matrix.Bitumen fractures were developed by hydraulic fracturing as the result of fluid overpressure in the organic matter. Overpressured bitumen has acted as a fracture driver, generating bitumen veins in both the organic-rich mudstones and the adjacent chert and silicified intervals.

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“…The phase-field method, broadly used in the material science community for modeling microstructure evolution accompanying phase transitions (e.g., review articles; Chen, 2002;Moelans et al, 2008;Nestler & Choudhury, 2011;Qin & Bhadeshia, 2010), has recently emerged as a powerful computational approach for modeling anisotropic cement overgrowths in calcite (Prajapati et al, 2018) and quartz veins (Ankit et al, 2013, Ankit, Selzer, et al, 2015, Ankit, Urai, & Nestler, 2015Wendler et al, 2015). These works provide a basis for an entirely new generation of cementation models for sedimentary basins.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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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. Furthermore, computational fluid dynamics analysis is performed in order to derive the temporal evolution of permeability in numerically cemented microstructures. The obtained permeability‐porosity relationships are coherent with previous findings. Finally, we highlight the capabilities of the present modeling approach in simulating 3‐D reactive flow during progressive sealing in porous rocks based on innovative postprocessing analyses and advanced visualization techniques.

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Modeling fracture cementation processes in calcite limestone: a phase-field study

Cited by 24 publications

References 42 publications

Quartz Cementation in Polycrystalline Sandstone: Insights From Phase‐Field Simulations

Quartz Cementation in Polycrystalline Sandstone: Insights From Phase‐Field Simulations

Genesis and role of bitumen in fracture development during early catagenesis

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

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