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14 results for “Gas hydrate”
Datasets associated with Uruti Basin gas hydrate heat flow feature investigated as part of Roger Revelle voyage RR1508
<p>Processed seismic reflection data and associated files from Roger Revelle voyage RR1508: 16 May - 18 June 2015. The research voyage aimed to characterise the thermal regime of the gas hydrate systems on the southern Hikurangi margin east of New Zealand. Data were processed using the Globe Claritas processing software.</p> <p>All SEG-Y files have the following binary header word definitions, required for loading data:</p> <p>Start time: 2-byte integer: Bytes 105-106</p> <p>Trace Sample Count: 2-byte integer: Bytes 115-116</p> <p>Sample Interval (microseconds): 2-byte integer: Byte 117-118</p> <p>CDP Number: 4-byte integer: Bytes 5-8</p> <p>CDP X location: 4-byte integer: Bytes 197-200 (Note: Coordinates are in metres of UTM Zone 60S, WGS84 Datum)</p> <p>CDP Y location: 4-byte integer: Bytes 201-204 (Note: Coordinates are in metres of UTM Zone 60S, WGS84 Datum)</p>
Particle displacement characterization during gas replacement of hydrate-bearing sediment
<p>Text S1 is uploaded with name “Polymerization analysis.txt”. Detailed method information includes polymerization analysis. (Figure 5).</p> <p>Movie S1 is uploaded with name “Movie S1.gif”. Detailed information includes longitudinal cross-sectional X-ray CT images of the HBS.</p>
Modelled gas hydrate stability zone extents for Svalbard's fjord and near-shore settings
<p>Supplementary data to the published paper 'Modelling of the gas hydrate potential in Svalbard's fjords' (https://doi.org/10.1016/j.jngse.2021.104127). This archive includes geopackage files for each of the targeted fjords and contains (amongst others) bathymetric depth (Z, metres), top and base of the modelled GHSZ (GHSZ_T/GHSZ_B, metres depth), cumulative GHSZ cell count (#, 25 metres per), and the number of CTD data points within the radius (CTD_count and CTD2deep). Included onshore modelling data is to be ignored and considered a modelling artefact.</p>
A Flat-lying Transitional Free Gas to Gas Hydrate System in a Sand Layer in the Qiongdongnan Basin of the South China Sea
<p>Most marine gas hydrate systems follow a vertical pattern with gas hydrate overlying free gas. Here we document the discovery of a novel flat-lying transitional gas to hydrate system in a horizontal sand layer in the Qiongdongnan Basin of the South China Sea. Eight wells were drilled by the Guangzhou Marine Geological Survey in 2021-2022 to investigate the occurrence and mechanisms responsible for the formation of the system. We describe a free gas-bearing sand reservoir at the center of the system sustained by advecting hot fluids and gas; away from the advecting zone, the cooler, surrounding sand reservoir is filled with gas hydrate. Observations at this site show that temperature has a large control on hydrate formation in sands and may be a key mechanism which allows gas migration and hydrate formation in high-saturation hydrate filled sands.</p>
Consolidation behavior of gas hydrate-bearing sand at microscales
<p>This supporting information includes four figures S1-4, providing the vertical-sectional X-ray CT images of the hydrate-bearing sediment at 0.05MPa, 1MPa, 2MPa and 3MPa in the effective confining pressure</p> <p> </p> <p>Figure S1 is uploaded with file name Figure S1. Detailed information includes vertical-sectional X-ray CT images of the hydrate-bearing sediment at 0.05 MPa.</p> <p>Figure S2 is uploaded with file name Figure S2. Detailed information includes vertical-sectional X-ray CT images of the hydrate-bearing sediment at 1 MPa.</p> <p>Figure S3 is uploaded with file name Figure S3. Detailed information includes vertical-sectional X-ray CT images of the hydrate-bearing sediment at 2 MPa.</p> <p>Figure S2 is uploaded with file name Figure S4. Detailed information includes vertical-sectional X-ray CT images of the hydrate-bearing sediment at 3 MPa.</p>
Data from: Toward the development of cavitation technology for gas hydrate prevention
<p>In offshore gas well drilling and production, methane hydrate may block the tubing, resulting in the stoppage of gas production. Conventional methods such as injection of thermal hydrate inhibitors, thermal insulating or heating, gas dehydration, and reducing pressure are time-consuming and expensive, and sometimes they are not realistic in production conditions. New methods are needed to lower the cost of gas hydrate prevention and to overcome these limitations. The thermal effect of cavitation was applied to the prevention of gas hydrate in this study. The thermal impact of cavitation, supposed to heat the fluids and prevent the formation of gas hydrate, was evaluated. Numerical simulation was performed to study the thermal performance of cavitation. Furthermore, experimental studies of the influence of initial temperature, flow rate, fluid volume, and fluid viscosity on the thermal effect of cavitation were performed, and the results were analyzed.</p>
Rock physics models of gas hydrate bearing sediments – the classification, simulation workflow, and challenges
<p>This study reviews the rock physics models for simulating the elastic properties of gas hydrate bearing sediments. Considering that it is confusing to select the appropriate model for a specific study from the various models, we classify the models into five categories according to different principles. We also summarize a general workflow of the modeling process, elaborate the possible models in each step and bring up the potential sources of uncertainties. Besides, we explicate the general problems of the current models and raise several potential research directions. This study provides us a clear view of the rock physics models, the associated uncertainties, as well as the general modeling workflow of gas hydrate bearing sediments, and also provides some implications for future studies.</p>
Effective anisotropic and viscoelastic representation of gas-hydrate bearing sediments from harmonic numerical experiments
<p>The data are the binary patchy gas-hydrate contents and Lamé shear coefficient.</p>
Data from: Toward the development of cavitation technology for gas hydrate prevention
Open the record for dataset details and reuse information.
Permeability and gas production behavior of methane hydrate-bearing sediments with underlying gas
<p>These are the supporting data for the paper.</p>
Water and gas flow in dissociated hydrate-bearing sediments: flow characteristics, hysteresis and dynamic permeability
<p>Extracted pore network data;Fluid characteristics and simulation conditions</p>
X-ray diffraction (XRD) measurement of bulk and clay mineral composition at India National Gas Hydrate Program 01 (NGHP-01) Sites on the Indian continental margin (Krishna-Godavari Basin, Kerala-Konkan Basin, Mahanadi Basin, Andaman Sea)
<p>This dataset contains bulk and clay mineral relative abundances measured by X-ray diffraction (XRD) measured at 12 offshore sites drilled and cored during the Indian National Gas Hydrate Program 01 (NGHP-01) in 2006 by the JOIDES Resolution. Sediment samples from from the Kerala-Konkan Basin, Arabian Sea (Hole 01A), the Krishna-Godavari Basin, Bay of Bengal (Holes 03B, 05C, 07BD, 10BD, 14A, 15A, 16A, 20AB), the Andaman Sea (Hole 17A), and the Mahanadi Basin, Bay of Bengal (Holes 18A, 19A) were measured for bulk and clay XRD at the University of Missouri using a Scintag Pad V X-ray diffractometer.</p> <p>These sites are between 895 and 2663 m of water depth and were from drilled to depths between 172 and 675 m below seafloor. These data were published in:</p> <p><strong>Phillips, S.C., Johnson, J.E., Underwood, M.B., Guo, J., Giosan, L., and Rose, K., 2014. Long-timescale variation in bulk and clay mineral composition of Indian continental margin sediments in the Bay of Bengal, Andaman Sea, and Arabian Sea. <em>Marine and Petroleum Geology</em> 58A, 117-138, https://doi.org/10.1016/j.marpetgeo.2014.06.018 <a href="https://doi.org/10.1016/j.marpetgeo.2014.06.018">Link</a></strong></p> <p>Samples were collected at a resolution of approximately 1 per core. Four-component relative abundances (total clay, quartz, feldspar, calcite) of bulk sediment powders were calculated using a singular value decomposition (Fisher and Underwood, 1995). Clay fractions were prepared using the filter peel method and 0.45-mm membranes, and saturated with ethylene glycol (Moore and Reynolds, 1997). Clay mineral relative abundances (illite, smectite, kaolinite, chlorite) were calculated using the method of Biscaye (1965) for comparison with previously measured studies from the Indian Ocean. See Phillips et al. (2014) for additional information.</p> <p>References:</p> <p>Biscaye, P.E., 1965. Mineralogy and sedimentation of recent deep-sea clay in the Atlantic Ocean and adjacent seas and oceans. <em>Geological Society of America Bulletin</em>. 76, 803-832. https://doi.org/10.1130/0016-7606(1965)76[803:MASORD]2.0.CO;2</p> <p>Fisher, A.T., Underwood, M.B., 1995. Calibration of an X-ray diffraction method to determine relative mineral abundances in bulk powders using matrix singular value decomposition: a test from the Barbados accretionary complex. In: Shipley, T.H., Ogawa, Y., Blum, P. (Eds.), <em>Proceedings of the Ocean Drilling Program, Initial Reports</em>, vol. 156, pp. 29-37. doi:10.2973/odp.proc.ir.156.103.1995</p> <p>Moore, D.M., Reynolds, R.C., 1997. X-ray <em>Diffraction and the Identification and Analysis of Clay Minerals</em>, second ed. Oxford University Press, New York.</p> <p>Phillips, S.C., Johnson, J.E., Underwood, M.B., Guo, J., Giosan, L., and Rose, K., 2014. Long-timescale variation in bulk and clay mineral composition of Indian continental margin sediments in the Bay of Bengal, Andaman Sea, and Arabian Sea. <em>Marine and Petroleum Geology</em> 58A, 117-138, https://doi.org/10.1016/j.marpetgeo.2014.06.018</p>
A New Rock Physics Model for Predicting the Elastic Properties of Sediments Hosting Nodule and Chunk-like Natural Gas Hydrate Morphologies
<p>MATLAB codes and well logs used in the manuscript are included.</p>
Consolidation behavior of gas hydrate-bearing sand at microscales
<p>Moive S1 is uploaded with file name Movie S1. Detailed information includes the consolidation process of the gas hydrate-bearing sand, and the effective confining pressure is from 0.05 MPa to 3MPa.</p>
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