Quantification of gas hydrate saturation and morphology based on a generalized effective medium model

Pan, Haojie; Li, Hongbing; Chen, Jingyi; Riedel, Michael; Holland, Melanie; Zhang, Yan; Cai, Shengjuan

doi:10.1016/j.marpetgeo.2019.104166

Cited by 17 publications

(1 citation statement)

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“…A combination of geochemical data (gas hydrate dissociation related pore-fluid freshening upon corerecovery), core infra-red (IR) imaging, geophysical logging (P-wave velocity and electrical resistivity), in situ temperature measurements, and seismic observations of BSRs indicated that the base of the GHSZ matches the expected depth of a theoretical methane-dominated system in equilibrium with a hydrostatic pressure regime and the site-specific background pore-water salinity (Riedel et al 2010). In situ gas hydrate concentrations (Sh, reported here as percent of pore-space filled with hydrate) were estimated at all sites from different techniques: loggingbased electrical resistivity and P-wave velocity, pore-fluid chlorinity freshening, pressure core degassing, and IR imaging (e.g., Chen 2006;Malinverno et al 2008;Chen et al 2008;Torres et al 2008;Pan et al 2020). All techniques show overall low average concentrations of < 10% of the pore space (Fig.…”

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confidence: 99%

On the consolidation state of sediments from the accretionary prism offshore Vancouver Island, North Cascadia Margin

et al. 2022

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Sediment geotechnical properties are an important component of geohazard analyses and studies on submarine slope failures on continental margins. The northern Cascadia margin is a region of repeated subduction earthquakes and related geohazards including devastating tsunamis. Despite several drilling campaigns at this margin mostly for gas hydrate studies, sediment geotechnical properties are lacking to date. We therefore investigated a set of 20 half-round samples from four drill sites of Integrated Ocean Drilling Program (IODP) Expedition 311 along a margin-perpendicular transect. Samples were analysed for Atterberg properties (liquid limit, plasticity limit, plasticity index) and consolidation state (pre-consolidation stress, over-consolidation ratio, initial void ratio and compression index). Results of these parameters are in good agreement with similar studies at the southern Cascadia margin from Ocean Drilling Program (ODP) Leg 204 and are regarded robust, despite the long time-span between sample recovery in 2005 and our analyses. Individual results are interpreted at each of the drill sites and reflect the overall tectonic state of the location within the accretionary prism. An interplay of site-specific tectonic forcing, including thrust faulting, uplift, folding, and erosion appears to govern the depth-dependent consolidation state of the sediments.

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