Elastic properties of gas hydrate‐bearing sediments

Lee, Myung W.; Collett, Timothy S.

doi:10.1190/1.1444966

Cited by 100 publications

(70 citation statements)

References 21 publications

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“…A more definitive conclusion can be reached in the permafrost gas hydrate system, which has been studied in detail at the Mallik drill site in northern Canada. From high-resolution well logging, Lee and Collett (2001) inferred hydrate exists as a pore-filling rather than cementing phase in the sediment matrix.…”

Section: Discussionmentioning

confidence: 99%

Methane hydrate formation in partially water-saturated Ottawa sand

Waite

Winters

Mason

2004

American Mineralogist

251

192

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Bulk properties of gas hydrate-bearing sediment strongly depend on whether hydrate forms primarily in the pore fluid, becomes a load-bearing member of the sediment matrix, or cements sediment grains. Our compressional wave speed measurements through partially water-saturated, methane hydrate-bearing Ottawa sands suggest hydrate surrounds and cements sediment grains. The three Ottawa sand packs tested in the Gas Hydrate And Sediment Test Laboratory Instrument (GHASTLI) contain 38(1)% porosity, initially with distilled water saturating 58, 31, and 16% of that pore space, respectively. From the volume of methane gas produced during hydrate dissociation, we calculated the hydrate concentration in the pore space to be 70, 37, and 20% respectively. Based on these hydrate concentrations and our measured compressional wave speeds, we used a rock physics model to differentiate between potential pore-space hydrate distributions. Model results suggest methane hydrate cements unconsolidated sediment when forming in systems containing an abundant gas phase.

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Section: Discussionmentioning

confidence: 99%

Methane hydrate formation in partially water-saturated Ottawa sand

Waite

Winters

Mason

2004

American Mineralogist

251

192

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“…It was also assumed that low-amplitude reflections observed above some BSRs [Shipley et al, 1979] could be used to assess the concentration of gas hydrate within the stability zone [Lee et al, 1992]. However, the use of differing seismoacoustic acquisition techniques, such as multichannel seismics, ocean bottom seismometers [Katzman et al, 1994;Vanneste et al, 2002], deep tow seismics [Gettrust et al, 1999], vertical seismic profiling [Bangs et al, 1993;Holbrook et al, 1996], and down hole logging [Guerin et al, 1999;Lee and Collett, 2001], has led to a greater understanding of the nature of the BSR. The BSR is now considered to result from free gas in sedimentary layers beneath the hydrate stability zone (HSZ) [Holbrook et al, 1996;Korenaga et al, 1997;MacKay et al, 1994;Minshull et al, 1994;Singh et al, 1993].…”

Section: Nature and Distribution Of Marine Gas Hydratesmentioning

confidence: 99%

A laboratory investigation into the seismic velocities of methane gas hydrate‐bearing sand

2005

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[1] Remote seismic methods, which measure the compressional wave (P wave) velocity (V p ) and shear wave (S wave) velocity (V s ), can be used to assess the distribution and concentration of marine gas hydrates in situ. However, interpreting seismic data requires an understanding of the seismic properties of hydrate-bearing sediments, which has proved problematic because of difficulties in recovering intact hydrate-bearing sediment samples and in performing valid laboratory tests. Therefore a dedicated gas hydrate resonant column (GHRC) was developed to allow pressure and temperature conditions suitable for hydrate formation to be applied to a specimen with subsequent measurement of both V p and V s made at frequencies and strains relevant to marine seismic investigations. Thirteen sand specimens containing differing amounts of evenly dispersed hydrate were tested. The results show a bipartite relationship between velocities and hydrate pore saturation, with a marked transition between 3 and 5% hydrate pore saturation for both V p and V s . This suggests that methane hydrate initially cements sand grain contacts then infills the pore space. These results show in detail for the first time, using a resonant column, how hydrate cementation affects elastic wave properties in quartz sand. This information is valuable for validating theoretical models relating seismic wave propagation in marine sediments to hydrate pore saturation.Citation: Priest, J. A., A. I. Best, and C. R. I. Clayton (2005), A laboratory investigation into the seismic velocities of methane gas hydrate-bearing sand,

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“…Kinds of theoretical models describing HBS's mechanical parameters are presented based on the three existing forms. The main models include time-average model [100,101], cementation model [102][103][104], pore-filling model [105], weight-average model [106][107][108][109], effective medium model [103,110].…”

Section: Main Theoretical Modelsmentioning

confidence: 99%

“…Lee et al [108,109] presented a method to forecast the elastic wave speed of under-consolidated HBS, based on the Biot's [114,115] and Gassmann's theories [116], assuming that the ratio of shear wave speed to compressive wave speed is proportional to the speed ratio of skeleton to density. This formula has been used in the data logging and analysis in the Canadian mallik-2L well.…”

Section: Main Theoretical Modelsmentioning

confidence: 99%

Advances in Study of Mechanical Properties of Gas Hydrate-Bearing Sediments

鲁晓兵

张旭辉²,

王淑云³

2013

TOOEJ

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Gas hydrate (GH) is defined as the crystalline solid, or clathrate hydrate, which are formed by some kinds of low mass molecular gases, such as methane, carbon dioxide, and hydronitrogen, with water at relatively high pressure and low temperature conditions. Gas hydrate-bearing sediments (HBS) are some sand, clay and mixed sediment containing gas hydrates. Advances in the study on the mechanical properties of HBS are summarized mainly in aspects of the laboratory test, in-situ investigation, and theoretical model. Firstly, the main factors are discussed including the structure of GH, formation method and matrix characteristics of HBS; Secondly, progress on the laboratory tests and results are discussed, which mainly includes the tri-axial tests with the natural and synthesized HBS samples, the acoustic tests for measuring the elastic coefficients, the tests for investigating the effects of main factors such as the gas and water contents and soil types on the strength of HBS. Thirdly, for in-situ investigations, including the geophysical surveying, in-situ tests (such as downhole tests) and results are summarized; Fourthly, several theoretical models for estimating the mechanical properties of HBS are introduced; At last, the emphases and the tendency in the future study on the mechanical properties of HBS are discussed.

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Elastic properties of gas hydrate‐bearing sediments

Cited by 100 publications

References 21 publications

Methane hydrate formation in partially water-saturated Ottawa sand

Methane hydrate formation in partially water-saturated Ottawa sand

A laboratory investigation into the seismic velocities of methane gas hydrate‐bearing sand

Advances in Study of Mechanical Properties of Gas Hydrate-Bearing Sediments

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