Permeability of hydrate-bearing sediments

Ren, Xingwei; Guo, Zhiqiang; Ning, Fulong; Shu-zhi, MA

doi:10.1016/j.earscirev.2020.103100

Cited by 131 publications

(96 citation statements)

References 159 publications

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“…The thermal conductivity of HBS is complex because the formation of hydrate between sediment grains enhances the heat transfer between solid particles, and it is related to many parameters, including hydrate saturation, hydrate occurrence, and grain distribution (Dai et al, 2015;Waite et al, 2002Waite et al, , 2005Wang et al, 2017;Yang et al, 2015). Detailed literature reviews of the physical properties of HBS are discussed elsewhere (Li et al, 2016;Lijith et al, 2019;Ren et al, 2020;Waite et al, 2009;Yan et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Pore‐Scale 3D Morphological Modeling and Physical Characterization of Hydrate‐Bearing Sediment Based on Computed Tomography

Sun

et al. 2020

JGR Solid Earth

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Natural gas hydrate is considered to be a promising future energy resource; therefore, obtaining its physical properties is crucial for evaluating gas production efficiency and developing reasonable exploitation strategies. In this study, we present a novel pore-scale 3D morphological modeling algorithm considering various saturation and occurrences (cementing and pore-filling) of hydrate in sediments. To evaluate the performance of the presented algorithm, 14 hydrate-bearing sediment models were constructed based on X-ray computed tomographic images of a consolidated sandy specimen under an effective stress of 3 MPa. Morphologically, the new algorithm generated pore-scale hydrate occurrences coincide with published morphological behaviors of hydrate observed via computed tomography. The tortuosity and fractal dimension of pore spaces of these models were then characterized. The pore networks are also extracted, based on which the evolution of the pore characteristics including the distributions of pore radius, throat radius, throat length, and the coordination number were investigated. Using these generated models, simulations of permeability, thermal conductivity, and electrical conductivity were conducted to evaluate the influences of hydrate saturation and occurrence. These results are validated against published data, demonstrating that this algorithm could be an effective way to construct digital hydrate-bearing sediment models using a single set of computed tomographic images of a hydrate-free specimen. This new method can also be significant for the physical evaluation of natural cores in which hydrate has dissociated during core recovering and transferring.

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Section: Introductionmentioning

confidence: 99%

Pore‐Scale 3D Morphological Modeling and Physical Characterization of Hydrate‐Bearing Sediment Based on Computed Tomography

Sun

et al. 2020

JGR Solid Earth

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“…Thus, making the GHSZ sediments susceptible to mechanical failure induced by seismic activity (Yanchilina et al, 2018;W. Fan et al, 2020;Hillman et al, 2020), enhancing permeability (Kinoshita & Saffer, 2018;Ren et al, 2020) and creating pathways for gas expulsion from below the Bottom Simulating Reflector, in turn causing hydrocarbon venting and pockmark formation (Fig. 5).…”

Section: Pockmark Fieldsmentioning

confidence: 99%

Potential secondary events caused by early Holocene paleoearthquakes in Fennoscandia – a climate-related review

Eldholm¹,

Bungum²

2021

NJG

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During the last deglaciation of Fennoscandia, large earthquakes may have induced secondary effects on the high-latitude coastal regions and continental margins primarily from surface rock avalanches, large and small submarine slides, local and regional flooding, and tsunamis. In this overview, we show that the climate-earthquake-slide-tsunami causal sequence is particularly important, as is structural inheritance and rejuvenation. However, there are potential earthquake-generating early Holocene faults also beyond the previously defined Lapland Fault Province. Thus, we introduce the term the Greater Lapland Fault Province. Earthquakes in the expanded fault province are candidates for triggering the 8.1 ka Storegga Megaslide and/or its predecessors and coeval tsunamis. The events might have released other submarine slides, gas hydrate expulsion leaving large pockmark fields, rock avalanches and submarine mass wasting in fjord and lake settings. Moreover, the seismic events may also have triggered local and regional flooding by breakup of ice and sediment barriers.

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“…In addition, the permeability of hydrate-bearing sediments governs fluid flow during gas production, which also has significant influence on production efficiency [26,27]. Therefore, as reviewed by Ren et al [28], great efforts have been made to experimentally and numerically study the permeability of hydrate-bearing sediments (synthesized and cored samples). Measurements were mainly carried out by methods such as flow tests, NMR, CT, and their combination to obtain the intrinsic and relative permeability of hydrate-bearing sediments in which (water or gas) flow tests are widely used.…”

Section: Introductionmentioning

confidence: 99%

“…Further, considering the effect of pore shape, tortuosity, and surface area, models for grain-coating and pore-filling hydrates were built. In addition, microfactors such as pore-size distribution, throat radii, and capillarity were considered in recent works, as reviewed by Ren et al [28].…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Study on Hydrate Formation from Migrating Dissolved Gas in Sandy Sediments

Rehemituli

Zhang

et al. 2020

Energies

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Upward migration of gas-dissolved pore fluid is an important mechanism for many naturally occurring hydrate reservoirs. However, there is limited understanding in this scenario of hydrate formation in sediments. In this preliminary work, hydrate formation and accumulation from dissolved gas in sandy sediments along the migration direction of brine was investigated using a visual hydrate simulator. Visual observation was employed to capture the morphology of hydrates in pores through three sapphire tubes. Meanwhile, the resistivity evolution of sediments was detected to characterize hydrate distribution in sediments. It was observed that hydrates initially formed as a thin film or dispersed crystals and then became a turbid colloidal solution. With hydrate growth, the colloidal solution converted to massive solid hydrates. Electrical resistivity experienced a three-stage evolution process corresponding to the three observed hydrate morphologies. The results of resistivity analysis also indicated that the bottom–up direction of hydrate growth was consistent with the flow direction of brine, and two hydrate accumulation centers successively appeared in the sediments. Hydrates preferentially formed and accumulated in certain depths of the sediments, resulting in heterogeneous hydrate distribution. Even under low saturation, the occurrence of heterogeneous hydrates led to the sharp reduction of sediment permeability.

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Permeability of hydrate-bearing sediments

Cited by 131 publications

References 159 publications

Pore‐Scale 3D Morphological Modeling and Physical Characterization of Hydrate‐Bearing Sediment Based on Computed Tomography

Pore‐Scale 3D Morphological Modeling and Physical Characterization of Hydrate‐Bearing Sediment Based on Computed Tomography

Potential secondary events caused by early Holocene paleoearthquakes in Fennoscandia – a climate-related review

One-Dimensional Study on Hydrate Formation from Migrating Dissolved Gas in Sandy Sediments

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