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| Taleb, Farah; Garziglia, Sebastien; Sultan, Nabil. |
| Increasing needs for energy resources have moved deep offshore developments and research efforts towards regions where high pressure and low temperature conditions allow gas and water to form Gas Hydrates (GH). However, owing to difficulties in sampling and preserving GH under in-situ stability conditions, GH-bearing sediments remain particularly challenging to characterise using conventional laboratory methods. This paper presents the experience gained in the use acoustic and piezocone soundings in characterising gas-hydrate bearing clayey sediments offshore Nigeria. Acoustic measurements of compressional wave velocity are shown to be an expedient means of both detecting and quantifying GH in sediments. Piezocone data and their location in normalised soil... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00466/57748/60000.pdf |
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| Taleb, Farah; Garziglia, Sebastien; Sultan, Nabil. |
| The hydro‐mechanical properties of gas hydrate‐bearing sediment are key in assessing offshore geo‐hazards and the resource potential of gas hydrates. For sandy materials, such properties were proved highly dependent on hydrate content (Sh) as well as on their distribution and morphology. Owing to difficulties in testing gas hydrate‐bearing clayey sediments, the impact of hydrates on the behaviour of such materials remains poorly understood. Hence, to provide insight into the characterisation of clayey sediments containing hydrate, this study relies on a unique database of in‐situ acoustic, piezocone and pore‐pressure dissipation measurements collected in a high gas flux system offshore Nigeria. Compressional wave velocity measurements were used as means of... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00466/57746/59974.pdf |
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