Water retention curve for hydrate‐bearing sediments

Dai, Sheng; Santamarina, J. Carlos

doi:10.1002/2013gl057884

Cited by 43 publications

(27 citation statements)

References 44 publications

(47 reference statements)

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“…Higher initial hydrate saturation condition results in higher effective residual water saturation S rw *. This trend is also observed in the numerical simulation using a pore network model [ Dai and Santamarina , ]. But residual water saturation S rw remains almost constant at S rw = 0.07 for hydrate‐bearing sediments.…”

Section: Results and Analysesmentioning

confidence: 99%

The effect of hydrate saturation on water retention curves in hydrate‐bearing sediments

Mahabadi

Zheng

Jang

2016

Geophysical Research Letters

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The experimental measurement of water retention curve in hydrate‐bearing sediments is critically important to understand the behavior of hydrate dissociation and gas production. In this study, tetrahydrofuran (THF) is selected as hydrate former. The pore habit of THF hydrates is investigated by visual observation in a transparent micromodel. It is confirmed that THF hydrates are not wetting phase on the quartz surface of the micromodel and occupy either an entire pore or part of pore space resulting in change in pore size distribution. And the measurement of water retention curves in THF hydrate‐bearing sediments with hydrate saturation ranging from Sh = 0 to Sh = 0.7 is conducted for excess water condition. The experimental results show that the gas entry pressure and the capillary pressure increase with increasing hydrate saturation. Based on the experimental results, fitting parameters for van Genuchten equation are suggested for different hydrate saturation conditions.

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Section: Results and Analysesmentioning

confidence: 99%

The effect of hydrate saturation on water retention curves in hydrate‐bearing sediments

Mahabadi

Zheng

Jang

2016

Geophysical Research Letters

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“…In this study, we explore differences between gas invasion and gas nucleation, the evolution of gas saturation, capillary pressure, and relative permeabilities using both experimental and numerical methods. This study assumes a constant porous network and does not consider the solid mass loss during hydrate dissociation [refer to Dai and Santamarina , for complementary results]. A brief review of previous studies follows.…”

Section: Introductionmentioning

confidence: 99%

Evolution of gas saturation and relative permeability during gas production from hydrate‐bearing sediments: Gas invasion vs. gas nucleation

Jang

Santamarina

2014

JGR Solid Earth

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Capillarity and both gas and water permeabilities change as a function of gas saturation.Typical trends established in the discipline of unsaturated soil behavior are used when simulating gas production from hydrate-bearing sediments. However, the evolution of gas saturation and water drainage in gas invasion (i.e., classical soil behavior) and gas nucleation (i.e., gas production) is inherently different: micromodel experimental results show that gas invasion forms a continuous flow path while gas nucleation forms isolated gas clusters. Complementary simulations conducted using tube networks explore the implications of the two different desaturation processes. In spite of their distinct morphological differences in fluid displacement, numerical results show that the computed capillarity-saturation curves are very similar in gas invasion and nucleation (the gas-water interface confronts similar pore throat size distribution in both cases); the relative water permeability trends are similar (the mean free path for water flow is not affected by the topology of the gas phase); and the relative gas permeability is slightly lower in nucleation (delayed percolation of initially isolated gas-filled pores that do not contribute to gas conductivity). Models developed for unsaturated sediments can be used for reservoir simulation in the context of gas production from hydratebearing sediments, with minor adjustments to accommodate a lower gas invasion pressure P o and a higher gas percolation threshold.

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“…[] (supporting information). The relative permeability and capillary pressure models were initially developed for partially saturated sediments, but they can also be used to model fluid flow in hydrate systems with minor modifications depending on hydrate saturation [ Dai and Santamarina , ; Dai and Seol , ]. We use IGSs of 2%, appropriate to porous flow in gas hydrate‐bearing geologic systems [e.g., Liu and Flemings , ; Thatcher et al ., ], and 0%, which may be appropriate for purely fracture flow.…”

Section: Methods and Resultsmentioning

confidence: 99%

Mechanistic insights into a hydrate contribution to the Paleocene‐Eocene carbon cycle perturbation from coupled thermohydraulic simulations

Minshull

Marín‐Moreno

McKay

et al. 2016

Geophysical Research Letters

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During the Paleocene‐Eocene Thermal Maximum (PETM), the carbon isotopic signature (δ13C) of surface carbon‐bearing phases decreased abruptly by at least 2.5 to 3.0‰. This carbon isotope excursion (CIE) has been attributed to widespread methane hydrate dissociation in response to rapid ocean warming. We ran a thermohydraulic modeling code to simulate hydrate dissociation due to ocean warming for various PETM scenarios. Our results show that hydrate dissociation in response to such warming can be rapid but suggest that methane release to the ocean is modest and delayed by hundreds to thousands of years after the onset of dissociation, limiting the potential for positive feedback from emission‐induced warming. In all of our simulations at least half of the dissociated hydrate methane remains beneath the seabed, suggesting that the pre‐PETM hydrate inventory needed to account for all of the CIE is at least double that required for isotopic mass balance.

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Water retention curve for hydrate‐bearing sediments

Cited by 43 publications

References 44 publications

The effect of hydrate saturation on water retention curves in hydrate‐bearing sediments

The effect of hydrate saturation on water retention curves in hydrate‐bearing sediments

Evolution of gas saturation and relative permeability during gas production from hydrate‐bearing sediments: Gas invasion vs. gas nucleation

Mechanistic insights into a hydrate contribution to the Paleocene‐Eocene carbon cycle perturbation from coupled thermohydraulic simulations

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