Seismic indicators of gas hydrate and associated gas in the Ulleung Basin, East Sea (Japan Sea) and implications of heat flows derived from depths of the bottom-simulating reflector

Horozal, Senay; Lee, Gwang H.; Yi, Bo‐Yeon; Yoo, Dong Geun; Park, Keun P.; Lee, Ho Y.; Kim, Wonsik; Kim, Han J.; Lee, Keumsuk

doi:10.1016/j.margeo.2008.12.004

Cited by 104 publications

(72 citation statements)

References 52 publications

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“…Seismic data were mainly processed to define the regional distribution of BSRs and seismic blank zones (e.g., Ryu et al 2004Ryu et al , 2009Lee et al 2005;Yoo et al 2008Yoo et al , 2013Horozal et al 2009) as primary indicators for gas hydrates. The vertical extent of the GHSZ across the basin was defined either by using the BSRs or thermal modeling.…”

Section: Geophysical Data Acquisition and Processingmentioning

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: Geophysical Data Acquisition and Processingmentioning

confidence: 99%

“…An additional, preliminary study of geophysical indicators of gas hydrates in the Ulleung Basin using multichannel seismic data was reported by Lee et al (2005). A regional geological and thermal interpretation was provided by Horozal et al (2009) and Ryu et al (2009).…”

Section: Introductionmentioning

confidence: 99%

Gas hydrates in the Ulleung Basin, East Sea of Korea

Ryu¹,

Riedel²

2017

Terr. Atmos. Ocean. Sci.

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“…Seismic chimneys commonly occur in sedimentary basins, including those at passive volcanic margins, e.g. the Vøring and Møre margin basins, or the Ulleung Bain (Planke et al 2005;Horozal et al 2009). Around Antarctica, seismic chimneys have also been observed in basins of the Amundsen Sea and Ross Sea Embayment (Geletti and Busetti 2011;Weigelt et al 2012).…”

Section: Indications Of Potential Ventingmentioning

confidence: 99%

Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

Huang

Jokat

2016

Mar Geophys Res

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The relief of Dronning Maud Land (DML), formed by Middle and Late Mesozoic tectonic activity, had a strong spatial control on the early fluvial and subsequent glacial erosion and deposition. The sources, processes, and products of sedimentation along the DML margin and in the Lazarev Sea in front of the DML mountains have been barely studied. The onshore mountain belt parallel to the coast of the DML margin acts as a barrier to the transport of terrigenous sediments from the east Antarctic interior to the margin and into the Lazarev Sea. Only the Jutul-Penck Graben system allows a localized ice stream controlled transport of material from the interior of DML across its old mountain belt. Offshore, we attribute repeated largescale debris flow deposits to instability of sediments deposited locally on the steep gradient of the DML margin by high sediment flux. Two types of canyons are defined based on their axial dimensions and originated from turbidity currents and slope failures during glacial/fluvial transport. For the first time, we report pipe-like seismic structures in this region and suggest that they occurred as consequences of volcanic processes. Sedimentary processes on the DML margin were studied using seismic reflection data and we restricted the seismic interpretation to the identification of major seismic sequences and their basal unconformities.

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“…The disturbed seismic facies forming an elongate unit is interpreted as mass-flow deposits that are verti- Table 1) and a possible top of hydrate, respectively. cally and/or laterally associated with continuous reflection patterns (SF2) which is interpreted as THS (e.g., Horozal et al 2009). The basal surface of the SF1 includes a combination of linear scour marks and a side-wall scarp; and, its top forms a relatively rugose surface that is either filled and draped by concordant strata (SF2) or becomes the base of the overlying new SF1s.…”

Section: Seismic Signaturesmentioning

confidence: 99%

“…High-amplitude reflections and/ or acoustic turbidity tend to disappear gradually or become weaker near the base of the GHSZ (Horozal et al 2009;Netzeband et al 2010). The related seismic anomalies commonly occur beneath concave or convex seafloor expressions on seismic profiles (Ginsburg 1998); these zones are considered to be vertical conduits for fluids, probably migrating from below the GHSZ (Hyndman et al 2001;Wood et al 2002).…”

Section: Introductionmentioning

confidence: 99%

A Two-Dimensional Post-Stack Seismic Inversion for Acoustic Impedance of Gas and Hydrate Bearing Deep-Water Sediments Within the Continental Slope of the Ulleung Basin, East Sea, Korea

Lee¹,

Yoo²,

McMechan³

et al. 2013

Terr. Atmos. Ocean. Sci.

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A post-stack inversion of 2D seismic data was conducted to estimate the spatial distribution of acoustic impedance associated with gas and hydrates in the Ulleung Basin, East Sea, Korea constrained by logs from three boreholes drilled on its continental margin. A model-based inversion was applied to a Plio-Quaternary succession composed of alternations of unconsolidated mass-flow deposits/turbidites. A comparison of seismic reflections and synthetic data computed from impedance logs is shown for two zones. An upper (steep) slope zone contains a moderately continuous, possibly bottom-simulating reflector feature along the corresponding section. This feature may be associated with a lithology boundary near a drill site in addition to, or instead of, a stability boundary of gas hydrates (i.e., gas below and hydrates above). The lower (gentle) slope zone has locally cross-cutting reflection patterns that are more likely to be attributed to gas-and hydrate-related physical phenomena than to spatiotemporal changes in lithology. This seismic inversion is informative and useful, making a contribution to enhance the interpretability of the seismic profiles for a potential hydrate recovery.

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Seismic indicators of gas hydrate and associated gas in the Ulleung Basin, East Sea (Japan Sea) and implications of heat flows derived from depths of the bottom-simulating reflector

Cited by 104 publications

References 52 publications

Gas hydrates in the Ulleung Basin, East Sea of Korea

Gas hydrates in the Ulleung Basin, East Sea of Korea

Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

A Two-Dimensional Post-Stack Seismic Inversion for Acoustic Impedance of Gas and Hydrate Bearing Deep-Water Sediments Within the Continental Slope of the Ulleung Basin, East Sea, Korea

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