The interface evolution during methane hydrate dissociation within quartz sands and its implications to the permeability prediction based on NMR data

Liu, Lele; Wang, Daigang; Zhang, Zhun; Li, Chengfeng; Meng, Qingguo; Liu, Changling

doi:10.1016/j.marpetgeo.2021.105065

Cited by 15 publications

(17 citation statements)

References 31 publications

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“…NMR T 2 test provides a fast, easy, and non-destructive way of detecting hydrogenbearing fluids, which is widely used to monitor the dynamic behavior of gas hydrate formation and pore structure in sediments [30,[45][46][47][48][49][50][51][52][53]56,66,[68][69][70]. Figure 4 shows the schematic diagram of the NMR T 2 method applied to quantitative characterization of gas hydrate formation in sediments.…”

Section: Nmr T 2 Applicationmentioning

confidence: 99%

“…The gas hydrate showing a short T 2 cannot be identified because complete relaxation occurs before the first echo is detected [73]. Therefore, it is assumed that the NMR signals of hydrate and gas can be ignored by the LF-NMR [49,52,[54][55][56]66,69,70,74]. That is, the effective signals in the NMR T 2 measurement of gas hydrates are all from the water.…”

Section: Nmr T2 Relaxation Of Hydrate Water and Gasmentioning

confidence: 99%

“…In most studies, the effect of gas on the T 2 spectrum is negligible compared with the signal of water [30,52,55,66,70]. The gas hydrate is undetectable by LF-NMR [73].…”

Section: Saturation Of Water and Gas Hydratementioning

confidence: 99%

“…In addition, the ρ value of hydrate-bearing sediments is assumed to be constant in the process of hydrate formation [51,86]. Since the water relaxation at the water-sand interface mainly occurs at the sand particle surface while the proton spin is relaxed dominantly by intra-dipole-dipole interaction at the water-hydrate interface, the ρ value must be changed by the variations of the fluid-solid interface mineralogy and morphology in the hydrate formation process [53,68,70,79]. It suggests that further studies are required to understand the water-hydrate interface properties and ρ in hydrate-bearing sediments in the formation process of gas hydrate [94].…”

Section: Pore Size Distributionmentioning

confidence: 99%

“…The permeability of the hydrate formation process can be calculated by the T 2 spectrum. In oilfield NMR loggings, the permeability of sediments is obtained by the Schlumberger Doll Research model [56,70,105]. The permeability k can be calculated by:…”

Section: Permeabilitymentioning

confidence: 99%

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Advances in Characterizing Gas Hydrate Formation in Sediments with NMR Transverse Relaxation Time

Liu

Zhan

et al. 2022

Water

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The formation process, structure, and distribution of gas hydrate in sediments have become focal points in exploring and exploiting natural gas hydrate. To better understand the dynamic behavior of gas hydrate formation in sediments, transverse relaxation time (T2) of nuclear magnetic resonance (NMR) is widely used to quantitatively characterize the formation process of gas hydrate and the change in pore characteristics of sediments. NMR T2 has been considered as a rapid and non-destructive method to distinguish the phase states of water, gas, and gas hydrate, estimate the saturations of water and gas hydrate, and analyze the kinetics of gas hydrate formation in sediments. NMR T2 is also widely employed to specify the pore structure in sediments in terms of pore size distribution, porosity, and permeability. For the recognition of the advantages and shortage of NMR T2 method, comparisons with other methods as X-ray CT, cryo-SEM, etc., are made regarding the application characteristics including resolution, phase recognition, and scanning time. As a future perspective, combining NMR T2 with other techniques can more effectively characterize the dynamic behavior of gas hydrate formation and pore structure in sediments.

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Section: Nmr T 2 Applicationmentioning

confidence: 99%

Section: Nmr T2 Relaxation Of Hydrate Water and Gasmentioning

confidence: 99%

“…In most studies, the effect of gas on the T 2 spectrum is negligible compared with the signal of water [30,52,55,66,70]. The gas hydrate is undetectable by LF-NMR [73].…”

Section: Saturation Of Water and Gas Hydratementioning

confidence: 99%