Thermal conductivity measurements in unsaturated hydrate‐bearing sediments

Dai, Sheng; Cha, Jong-Ho; Rosenbaum, Eilis; Zhang, Wu; Seol, Yongkoo

doi:10.1002/2015gl064492

Cited by 43 publications

(22 citation statements)

References 31 publications

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“…Freezing occurs top down and results in the development of a crust that is ice rich. Silicates are a minor component of the mixture, and thus their impact on the thermal conductivity is small; see the supporting information, for example,Dai et al (2015),Durham et al (2010),Grimm and Mcween Jr (1989),Grindrod et al (2008),Muraoka et al (2014),Opeil et al (2010),Schofield et al (2014), Clathrates may represent the dominant form of water at pressures of a few MPa.…”

mentioning

confidence: 99%

Conditions for the Long‐Term Preservation of a Deep Brine Reservoir in Ceres

Castillo‐Rogez

Hesse

Formisano

et al. 2019

Geophysical Research Letters

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We propose a new internal evolution model for the dwarf planet Ceres matching the constraints on Ceres' present internal state from the Dawn mission observations. We assume an interior differentiated into a volatile‐dominated crust and rocky mantle, and with remnant brines in the mantle, all consistent with inferences from the Dawn geophysical observations. Simulations indicate Ceres should preserve a warm crust until present if the crust is rich in clathrate hydrates. The temperature computed at the base of the crust exceeds 220 K for a broad range of conditions, allowing for the preservation of a small amount of brines at the base of the crust. However, a temperature ≥250 K, for which at least 1 wt.% sodium carbonate gets in solution requires a crustal abundance of clathrate hydrates greater than 55 vol.%, a situation possible for a narrow set of evolutionary scenarios.

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mentioning

confidence: 99%

Conditions for the Long‐Term Preservation of a Deep Brine Reservoir in Ceres

Castillo‐Rogez

Hesse

Formisano

et al. 2019

Geophysical Research Letters

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“…The thermal module consists two major components: one is for in situ temperature measurement using the two thermal couples housed in the tip module (data can be used for the inversion of thermal conductivity) and the other one using transient plane heat source [Dai et al, 2015] to measure temperature and thermal conductivity.…”

Section: Thermal Modulementioning

confidence: 99%

“…So this becomes a problem of a plane heat source dissipating into two media, with thermal properties known for the substrate but to be determined for the tested specimen. Reasonably accurate thermal conductivity data of hydrate-bearing sediments can be achieved after simplification assumptions [Dai et al, 2015]. Right: Impacts of the S-TPS probe configuration on measured thermal properties of the specimens.…”

Section: Thermal Modulementioning

confidence: 99%

Borehole Tool for the Comprehensive Characterization of Hydrate-bearing Sediments

Dai

Santamarina

2017

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“…The test production created a world record for the longest sustained gas production and the largest total gas production [5]. The success of the test production not only provided an important foundation for the commercial exploitation of natural gas hydrate, but also brought many challenges and urgent problems to be solved [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Permeability Evolution at Various Pressure Gradients in Natural Gas Hydrate Reservoir at the Shenhu Area in the South China Sea

et al. 2019

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The sediment of the hydrate reservoir in the Shenhu Area is mainly clayey silt. Its characteristic small particles and poor cementation challenge the quantification of the reservoir permeability during gas production. An accurate description of the seepage mechanism of the clayey-silt reservoir is the basis, and also a difficulty, of effective development of gas in the South China Sea. In this study, four sets of water seepage experiments under different pressure gradients are carried out using the clayey-silt reservoir sediments, in which the fourth sample was subjected to computed tomographic (CT) scans. The experimental results shows that the clayey-silt reservoir has a compression of the pore structure and decreasing permeability with the increasing pressure gradient. CT images are used to show the reduction of pore spaces for fluid flow. When the pressure gradient is less than 3 MPa per meter, the pore structure of the reservoir has minor changes. When the pressure gradient is greater than this value, the pore structure of the reservoir will be quickly compressed. This leads to a rapid decrease in permeability, and the process of permeability reduction is irreversible. The decrease of permeability can be predicted directly by establishing a power law model with the change of porosity. Our experimental results preliminarily reveal the dynamic evolution law of pore structure and permeability of clayey-silt reservoir in the process of gas hydrate exploitation via depressurization. The permeability evolution law at various pressure gradients provides a scientific and reasonable basis of a productivity control system for clayey-silt gas hydrate in depressurized gas production.

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Thermal conductivity measurements in unsaturated hydrate‐bearing sediments

Cited by 43 publications

References 31 publications

Conditions for the Long‐Term Preservation of a Deep Brine Reservoir in Ceres

Conditions for the Long‐Term Preservation of a Deep Brine Reservoir in Ceres

Borehole Tool for the Comprehensive Characterization of Hydrate-bearing Sediments

Permeability Evolution at Various Pressure Gradients in Natural Gas Hydrate Reservoir at the Shenhu Area in the South China Sea

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