Gas hydrate growth and dissociation in narrow pore networks: capillary inhibition and hysteresis phenomena

Anderson, Ross; Tohidi, Bahman; Webber, J. Beau W.

doi:10.1144/sp319.12

Cited by 64 publications

(48 citation statements)

References 60 publications

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“…This phenomenon is implemented in the simulator as a translation of the phase diagram dependent on the effective pore radius of the grid block of interest. The change in methane hydrate freezing temperature is calculated as follows [ Anderson et al ., ]:

Δ T_{m} = \frac{{- 2 T}_{m b} σ_{h l} normalcos (|, θ)}{H_{f} ρ_{h} r_{e}},

where T mb is the freezing temperature of methane hydrate in bulk water,

σ_{h l}

is the solid‐liquid interfacial energy between hydrate and water,

θ

is the hydrate wetting angle to the pore surface, H f is the hydrate bulk enthalpy of fusion, ρ h is the density of methane hydrate, and r e is the effective pore radius describing the change in freezing temperature in a pore of radius r e .…”

Section: Methodsmentioning

confidence: 99%

Linking basin‐scale and pore‐scale gas hydrate distribution patterns in diffusion‐dominated marine hydrate systems

Nole

Daigle

Cook

et al. 2017

Geochem Geophys Geosyst

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The goal of this study is to computationally determine the potential distribution patterns of diffusion-driven methane hydrate accumulations in coarse-grained marine sediments. Diffusion of dissolved methane in marine gas hydrate systems has been proposed as a potential transport mechanism through which large concentrations of hydrate can preferentially accumulate in coarse-grained sediments over geologic time. Using one-dimensional compositional reservoir simulations, we examine hydrate distribution patterns at the scale of individual sand layers (1-20 m thick) that are deposited between microbially active fine-grained material buried through the gas hydrate stability zone (GHSZ). We then extrapolate to two-dimensional and basin-scale three-dimensional simulations, where we model dipping sands and multilayered systems. We find that properties of a sand layer including pore size distribution, layer thickness, dip, and proximity to other layers in multilayered systems all exert control on diffusive methane fluxes toward and within a sand, which in turn impact the distribution of hydrate throughout a sand unit. In all of these simulations, we incorporate data on physical properties and sand layer geometries from the Terrebonne Basin gas hydrate system in the Gulf of Mexico. We demonstrate that diffusion can generate high hydrate saturations (upward of 90%) at the edges of thin sands at shallow depths within the GHSZ, but that it is ineffective at producing high hydrate saturations throughout thick (greater than 10 m) sands buried deep within the GHSZ. Furthermore, we find that hydrate in fine-grained material can preserve high hydrate saturations in nearby thin sands with burial.Plain Language Summary This study combines one-, two-, and three-dimensional simulations to explore one potential process by which methane dissolved in water beneath the seafloor can be converted into solid methane hydrate. This work specifically examines one end-member methane transport mechanism, diffusion, and its potential to help grow methane hydrate in the pore space of marine sediments. The simulations presented here span hundreds of thousands of years to capture the evolution of a diffusion-dominated gas hydrate system over geologic time.

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Δ T_{m} = \frac{{- 2 T}_{m b} σ_{h l} normalcos (|, θ)}{H_{f} ρ_{h} r_{e}},

where T mb is the freezing temperature of methane hydrate in bulk water,

σ_{h l}

is the solid‐liquid interfacial energy between hydrate and water,

θ

Section: Methodsmentioning

confidence: 99%

Linking basin‐scale and pore‐scale gas hydrate distribution patterns in diffusion‐dominated marine hydrate systems

Nole

Daigle

Cook

et al. 2017

Geochem Geophys Geosyst

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“…However, changes in the pore size may change capillary pressures in the sediment. High capillary pressures can cause changes in the temperature/pressure condition (Anderson et al 2009). Because of the uncertainties in quantifying gas hydrates in the study area since the LGM, we neglect capillary pressures and the latent heat inherent to hydrate dissociation due to warming in our modelling.…”

Section: Theoretical Modelling Of Hydrate Stability Conditionsmentioning

confidence: 99%

Norwegian margin outer shelf cracking: a consequence of climate-induced gas hydrate dissociation?

Mienert

Vanneste

Haflidason

et al. 2010

Int J Earth Sci (Geol Rundsch)

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A series of en echelon cracks run nearly parallel to the outer shelf edge of the mid-Norwegian margin. The features can be followed in a *60-km-long and *5-km-wide zone in which up to 10-m-deep cracks developed in the seabed at 400-550 m water depth. The time of the seabed cracking has been dated to 7350 14 C years BP (8180 cal years BP), which corresponds with the main Storegga Slide event (8100 ± 250 cal. years BP). Reflection seismic data suggest that the cracks do not appear to result from deep-seated faults, but it cannot be ruled out completely that tension crevices were created in relation to past movements on the headwall of the Storegga slide. The cracking zone corresponds well to the zone where the base of the hydrate stability zone (BHSZ) outcrops. Evidence of fluid release in the BHSZ outcrop zone comes from an extensive pockmark field. We suggest that post-glacial ocean warming triggered the dissociation of gas hydrates while the interplay between dissociation, overpressure, and sediment fracturing on the outer shelf remains to be understood.

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“…For modeling purposes, the value for the liquidhydrate interfacial tension, the only parameter required for the modeling, was considered to be 0.032 J/m 2 and the shape factor equal to one as it is a function of curvature of hydrateliquid interface. More details about the modeling of gas hydrate growth and dissociation in narrow pores and capillary inhibition effect can be found elsewhere (Anderson et al, 2006;Llamedo et al, 2004).…”

Section: Modeling the Capillary Effect On Hydrate Stability Conditionmentioning

confidence: 99%

Methane and Water Phase Equilibria in the Presence of Single and Mixed Electrolyte Solutions Using the Cubic-Plus-Association Equation of State

Haghighi

Chapoy

Tohidi

2008

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Application de l'équation d'état Cubic-Plus-Association pour la prédiction des équilibres entre phases pour les systèmes contenant du méthane et de l'eau en présence d'électrolyte(s) -Les hydrates de méthane ont été largement présentés comme une potentielle nouvelle source d'énergie. Les hydrates à l'état naturel peuvent se former dans diverses roches ou sédiments si les conditions appropriées de pression et température en présence d'eau et de méthane sont réunies. Toutefois, la salinité des eaux de formation peut connaître d'importantes variations, et ces changements modifient la zone de stabilité des hydrates. En outre, l'eau de gisement produite avec les fluides de réservoir peut contenir diverses quantités de sels, pouvant prévenir la formation d'hydrates. Par conséquent, il est essentiel d'obtenir une meilleure compréhension de l'effet des sels sur la stabilité des hydrates. Dans cette communication, de nouvelles données expérimentales de dissociation d'hydrates de méthane en présence de solutions aqueuses contenant différentes concentrations de NaCl, KCl et de MgCl 2 ont été réalisées. Les nouvelles données ont été mesurées en utilisant une méthode à volume constant. La précision et la fiabilité des mesures expérimentales ont été démontrées en comparant les mesures avec les données de la littérature. Une approche thermodynamique dans lequel l'équation d'état CPA est combinée avec une modification du terme électrostatique proposé par Debye-Hückel a été employée pour modéliser les équilibres entre phases. Les conditions de formation d'hydrates sont modélisées par la théorie développée par van der Waals et Platteeuw. Pour modéliser en milieux poreux les équilibres entre phases d'hydrate, l'effet de la pression capillaire a été pris en compte. Les prédictions du modèle développé ont été validées par rapport à des données expérimentales indépendantes et les données obtenues dans ce travail. Un bon accord entre les prédictions et les données expérimentales a été observé, confirmant la fiabilité du modèle développé. Abstract -Methane and Water Phase Equilibria in the Presence of Single and Mixed Electrolyte

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Gas hydrate growth and dissociation in narrow pore networks: capillary inhibition and hysteresis phenomena

Cited by 64 publications

References 60 publications

Linking basin‐scale and pore‐scale gas hydrate distribution patterns in diffusion‐dominated marine hydrate systems

Linking basin‐scale and pore‐scale gas hydrate distribution patterns in diffusion‐dominated marine hydrate systems

Norwegian margin outer shelf cracking: a consequence of climate-induced gas hydrate dissociation?

Methane and Water Phase Equilibria in the Presence of Single and Mixed Electrolyte Solutions Using the Cubic-Plus-Association Equation of State

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