Physical properties of sediments from the Ulleung Basin, East Sea: Results from Second Ulleung Basin Gas Hydrate Drilling Expedition, East Sea (Korea)

Lee, J.Y.; Kim, G.-Y.; Kang, Nyeon‐Keon; Yi, Bo‐Yeon; Jung, Jongwon; Im, Junhyuck; Son, Byeong-Kook; Bahk, Jang-Jun; Chun, Jong-Hwa; Ryu, Byungki; Kim, D.S.

doi:10.1016/j.marpetgeo.2013.05.017

Cited by 49 publications

(21 citation statements)

References 34 publications

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“…As shown by an earlier study (Kim et al 2013c), the finegrained sedimentary sections were classified as high plastic silty soils according to the Unified Soil Classification System (USCS); they exhibited high compressibility when subjected to an increase in effective stress (or a decrease in pore water pressure) and had low hydraulic conductivities and low pressure diffusion coefficients. Similar to the analyses by Kim et al (2013c) and Lee et al (2013) predicted that the application of depressurization for gas hydrate production would cause a significant amount of sediment compaction. Lee et al (2013) documented that the sediments in the basin consists mineralogically of illite, kaolinite, chlorite, calcite, and montmorillonite, with a high concentration of microfossils (diatoms).…”

Section: Resource Assessments Production Test Model and Geotechnicasupporting

confidence: 54%

“…Similar to the analyses by Kim et al (2013c) and Lee et al (2013) predicted that the application of depressurization for gas hydrate production would cause a significant amount of sediment compaction. Lee et al (2013) documented that the sediments in the basin consists mineralogically of illite, kaolinite, chlorite, calcite, and montmorillonite, with a high concentration of microfossils (diatoms). They also argue that the presence of microfossils may affect many of the geotechnical properties, including plasticity, activity, surface area, and grain size.…”

Section: Resource Assessments Production Test Model and Geotechnicasupporting

confidence: 54%

“…Using the data from the two drilling expeditions, significant improvements of the understanding of changes in sediment physical properties due to production were made. Lee et al (2013) showed that subsidence induced by pore pressure changes as result of depressurization would be greater than changes induced by the loss of gas hydrate in the reservoir itself. They also predicted significant vertical deformation in fine-grained sediment layers as a response to the pore pressure changes from depressurization.…”

Section: Resource Assessments Production Test Model and Geotechnicamentioning

confidence: 99%

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Gas hydrates in the Ulleung Basin, East Sea of Korea

Ryu¹,

Riedel²

2017

Terr. Atmos. Ocean. Sci.

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To develop gas hydrates as a potential energy source, geophysical surveys and geological studies of gas hydrates in the Ulleung Basin, East Sea off the east coast of Korea have been carried out since 1997. Bottom-simulating reflector (BSR), initially used indicator for the potential presence of gas hydrates was first identified on seismic data acquired in 1998. Based on the early results of preliminary R&D project, 12367 km of 2D multichannel reflection seismic lines, 38 piston cores, and multi-beam echo-sounder data were collected from 2000 to 2004. The cores showed high amounts of total organic carbon and high residual hydrocarbon gas levels. Gas composition and isotope ratios define it as of primarily biogenic origin. In addition to the BSRs that are widespread across the basin, numerous chimney structures were found in seismic data. These features indicate a high potential of the Ulleung Basin to host significant amounts of gas hydrate. Dedicated geophysical surveys, geological and experimental studies were carried out culminating in two deep drilling expeditions, completed in 2007 and 2010. Sediment coring (including pressure coring), and a comprehensive well log program complements the regional studies and were used for a resource assessment. Two targets for a future test-production are currently proposed: pore-filling gas hydrate in sand-dominated sediments and massive occurrences of gas hydrate within chimney-like structures. An environmental impact study has been launched to evaluate any potential risks to production.

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Section: Resource Assessments Production Test Model and Geotechnicasupporting

confidence: 54%

Section: Resource Assessments Production Test Model and Geotechnicasupporting

confidence: 54%

Section: Resource Assessments Production Test Model and Geotechnicamentioning

confidence: 99%

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Gas hydrates in the Ulleung Basin, East Sea of Korea

Ryu¹,

Riedel²

2017

Terr. Atmos. Ocean. Sci.

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“…a Pressure was calculated assuming (1b). b Seafloor temperature was measured at each of the drilling site Lee et al (2013). c Temperature is estimated from seafloor temperature and geothermal gradient with (1c).…”

Section: Model Results and Discussionmentioning

confidence: 99%

Methane Hydrate Formation in Ulleung Basin Under Conditions of Variable Salinity: Reduced Model and Experiments

et al. 2016

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In this paper, we present a reduced model of methane hydrate formation in variable salinity conditions, with details on the equilibrium phase behavior adapted to a case study from Ulleung Basin. The model simplifies the comprehensive model considered by Liu and Flemings using common assumptions on hydrostatic pressure, geothermal gradient, and phase incompressibility, as well as a simplified phase equilibria model. The two-phase threecomponent model is very robust and efficient as well as amenable to various numerical analyses, yet is capable of simulating realistic cases. We compare various thermodynamic models for equilibria as well as attempt a quantitative explanation for anomalous spikes of salinity observed in Ulleung Basin.

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“…Physical properties of the hydrate-hosting medium, such as particle size, thermal conduction characteristics, and mechanical properties, are important elements for these assessments [25,26]. Generally, particle Knowing the physical properties of sediments can aid in the basic understanding of the gas hydrate occurrence rates and is important for the design and optimization of gas hydrate production technologies [22][23][24]. The establishment of safe and efficient production methods for utilization requires evaluating the production rate, well bore stability, and flow assurances [23].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Physical Properties of Hydrate Sediments Recovered from the Pearl River Mouth Basin in the South China Sea: Preliminary Investigation for Gas Hydrate Exploitation

et al. 2017

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Laboratory based research on the physical properties of gas hydrate hosting sediment matrix was carried out on the non-pressurized hydrate-bearing sediment samples from the Chinese Guangzhou Marine Geological Survey 2 (GMGS2) drilling expedition in the Pearl River Mouth (PRM) basin. Measurements of index properties, surface characteristics, and thermal and mechanical properties were performed on ten sediment cores. The grains were very fine with a mean grain size ranging from 7 to 11 µm throughout all intervals, which provide guidance for the option of a screen system. Based on X-ray Computed Tomography (CT) and SEM images, bioclasts, which could promote hydrate formation, were not found in the PRM basin. However, the flaky clay might be conducive to hydrate formation in pore spaces. The measured sediment thermal conductivities are relatively low compared to those measured at other mines, ranging from 1.3 to 1.45 W/(m·K). This suggests that thermal stimulation may not be a good option for gas production from hydrate-bearing sediments in the PRM basin, and depressurization could exacerbate the problems of gas hydrate reformation and/or ice generation. Therefore, the heat transfer problem needs to be considered when exploiting the natural gas hydrate resource within these areas. In addition, the results of testing the mechanical property indicate the stability of hydrate-bearing sediments decreases with hydrate dissociation, suggesting that a holistic approach should be considered when establishing a drilling platform. Both the heat-transfer characteristic and mechanical property provide the foundation for the establishment of a safe and efficient production technology for utilizing the hydrate resource.

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Physical properties of sediments from the Ulleung Basin, East Sea: Results from Second Ulleung Basin Gas Hydrate Drilling Expedition, East Sea (Korea)

Cited by 49 publications

References 34 publications

Gas hydrates in the Ulleung Basin, East Sea of Korea

Gas hydrates in the Ulleung Basin, East Sea of Korea

Methane Hydrate Formation in Ulleung Basin Under Conditions of Variable Salinity: Reduced Model and Experiments

Analysis of the Physical Properties of Hydrate Sediments Recovered from the Pearl River Mouth Basin in the South China Sea: Preliminary Investigation for Gas Hydrate Exploitation

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