Early-stage hypogene karstification in a mountain hydrologic system: A coupled thermohydrochemical model incorporating buoyant convection

Chaudhuri, Abhijit; Rajaram, Harihar; Viswanathan, Hari

doi:10.1002/wrcr.20427

Cited by 43 publications

(38 citation statements)

References 46 publications

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“…Therefore, we use an intermediate porosity of 0.01 in the fracture for the base case and vary porosity in sensitivity analyses. This discussion of flow‐weighted and volume‐weighted porosity and the cubic law to assign permeability is intended to inform the representation of a fracture within a numerical grid without using an extremely fine (∼1 mm) grid that resolves physical dimensions of the fracture aperture [ Chaudhuri et al ., ].

ϕ_{f w} = \frac{b ϕ_{f}}{Δ x}

ϕ_{v w} = \frac{ϕ_{m} (Δ x - b) + b ϕ_{f}}{Δ x}

…”

Section: An Expanded Model Of Long‐term Hf Fluid Migrationmentioning

confidence: 99%

Hydraulic fracturing fluid migration in the subsurface: A review and expanded modeling results

et al. 2015

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Understanding the transport of hydraulic fracturing (HF) fluid that is injected into the deep subsurface for shale gas extraction is important to ensure that shallow drinking water aquifers are not contaminated. Topographically driven flow, overpressured shale reservoirs, permeable pathways such as faults or leaky wellbores, the increased formation pressure due to HF fluid injection, and the density contrast of the HF fluid to the surrounding brine can encourage upward HF fluid migration. In contrast, the very low shale permeability and capillary imbibition of water into partially saturated shale may sequester much of the HF fluid, and well production will remove HF fluid from the subsurface. We review the literature on important aspects of HF fluid migration. Single-phase flow and transport simulations are performed to quantify how much HF fluid is removed via the wellbore with flowback and produced water, how much reaches overlying aquifers, and how much is permanently sequestered by capillary imbibition, which is treated as a sink term based on a semianalytical, one-dimensional solution for two-phase flow. These simulations include all of the important aspects of HF fluid migration identified in the literature review and are performed in five stages to faithfully represent the typical operation of a hydraulically fractured well. No fracturing fluid reaches the aquifer without a permeable pathway. In the presence of a permeable pathway, 10 times more fracturing fluid reaches the aquifer if well production and capillary imbibition are not included in the model.

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ϕ_{f w} = \frac{b ϕ_{f}}{Δ x}

ϕ_{v w} = \frac{ϕ_{m} (Δ x - b) + b ϕ_{f}}{Δ x}

…”

Section: An Expanded Model Of Long‐term Hf Fluid Migrationmentioning

confidence: 99%

Hydraulic fracturing fluid migration in the subsurface: A review and expanded modeling results

et al. 2015

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“…However, little work has been done to quantitatively model such systems. Birk et al (2005) examined the development of gypsum maze caves in an artesian setting, and a series of studies has examined dissolution under cooling and buoyantly driven flows (Andre & Rajaram 2005;Chaudhuri et al 2008Chaudhuri et al , 2013. Little mathematical modeling work has been done on sulphuric acid speleogenesis.…”

Section: The Next Generation Of Speleogenesismentioning

confidence: 99%

Consider a cylindrical cave: A physicist's view of cave and karst science

Covington

Perne

2016

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IzvlečekUDK 551.44:53 Matthew D. Covington & Matija Perne: Vzemimo valjasto jamo: pogled fizika na znanost o jamah in krasu V članku pregledava trenutno poznavanje fizike jam in krasa. Pri tem se osredotočava na raziskave, ki so razumevanje kraških procesov poglobile z uporabo preprostih modelov na osnovi fizike. Obravnavava vedenje jamskega ozračja, transport v kraških kanalih in modele nastanka jam ter povezanih procesov. Izpostavljava sodobna dognanja na teh področjih in iščeva obetavne teme za nadaljnje raziskave. Po najinem mnenju so mnoga med bolj privlačnimi odprtimi vprašanji povezana z medsebojnim vplivom med obravnavanimi tremi skupinami procesov. AbstractUDC 551.44:53 Matthew D. Covington & Matija Perne: Consider a cylindrical cave: A physicist's view of cave and karst scienceWe review the current understanding of the physics of caves and karst. Our review focuses on research that has used simple physically based models to improve understanding of processes that occur in karst. The topics we cover include cave atmosphere dynamics, transport within karst conduits, and models of speleogenesis and related processes. We highlight recent advances in these subjects and attempt to identify promising areas for future work. In our judgment, many of the most intriguing open questions relate to the interactions between these three groups of processes.

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“…Modeling of conduit development by hydrothermal dissolution along localized cross-formational fractures (Andre & Rajaram 2005;Rajaram et al 2009) revealed that the thermal coupling between the fluid and rock also causes the suppression of the flow-growth feedback and speleogenetic competition soon after breakthrough. Another specific feature of hypogene speleogenesis is the great role of buoyancy circulation (Klimchouk 1997b(Klimchouk , 2007, which has been confirmed and thoroughly studied by thermohydrochemical modeling (Chaudhuri et al 2013).…”

Section: The Author Defines Hypogene Speleogenesis As the Formation Omentioning

confidence: 95%

The Karst Paradigm: Changes, Trends and Perspectives

Klimchouk

2016

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UDC 551.435.8 Alexander Klimchouk: The karst paradigm: changes, trends and perspectives The paper examines representative definitions of karst (21), and discusses some concepts that influenced the modern understanding of the phenomenon. Several trends are discussed that took karst science beyond the limits of the traditional paradigm of karst. Dramatic progress in studies of speleogenesis plays the most significant role in changes taking place in the general understanding of karst. Also important is an adoption of the broad perspective to karst evolution which goes beyond the contemporary geomorphologic epoch and encompasses the entire life of a geological formation. Speleogenesis is viewed as a dynamic hydrogeological process of self-organization of the permeability structure in soluble rocks, a mechanism of the specific evolution of the groundwater flow system. The result is that these systems acquire a new, "karstic", quality and more complex organization. Since almost all essential attributes of karst owe their origin to speleogenesis, the latter is considered as the primary mechanism of the formation of karst. Two fundamental types of speleogenesis, hypogene and epigene, differentiate mainly due to distinct hydrodynamic characteristics of the respective groundwater flow systems: (1) of layered aquifer systems and fracture-vein flow systems of varying depths and degrees of confinement, and (2) of hydrodynamically open, near-surface unconfined systems. Accordingly, two major genetic types of karst are distinguished: hypogene and epigene. They differ in many characteristics, notably in relationships with the surface, hydrogeological behaviour, groundwater quality, and the areas of practical importance and approaches to solving karst-related issues. Although views on essential attributes of karst have been clearly changing, this was not reflected in definitions of the notion which are in broad use in the earth-science literature. A refined approach is suggested to the notion of karst in which it is viewed as a groundwater (fluid) flow system of a specific kind, which has acquired its peculiar properties in the course of speleogenesis. Keywords: karst, definition of karst, speleogenesis, karst geosystem, karst evolution. IzvlečekUDK 551.435.8 Alexander Klimchouk: Kraška paradigma: spremembe, tre ndi in perspektive Dokument obravnava reprezentativne definicije krasa (21) in obravnava nekatere koncepte, ki so vplivali na sodobno razumevanje tega pojava. Razpravlja o več trendih, ki so popeljali krasoslovje preko meja tradicionalne paradigme krasa. Dramatični napredek v speleogenetskih raziskavah je igral najpomembnejšo vlogo pri spremembah, ki so se zgodile pri splošnem razumevanju krasa. Prav tako je za razvoj krasoslovja pomembno sprejetje široke perspektive, ki presega sodobno geomorfološko epoho in zajema celoten geološki razvoj. Speleogeneza je predstavljena kot dinamični hidrogeološki proces samoorganizacije stopnje prepustnosti posameznih struktur v topnih kamninah, to je kot mehanizem specifičnega ...

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Early-stage hypogene karstification in a mountain hydrologic system: A coupled thermohydrochemical model incorporating buoyant convection

Cited by 43 publications

References 46 publications

Hydraulic fracturing fluid migration in the subsurface: A review and expanded modeling results

Hydraulic fracturing fluid migration in the subsurface: A review and expanded modeling results

Consider a cylindrical cave: A physicist's view of cave and karst science

The Karst Paradigm: Changes, Trends and Perspectives

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