Laboratory analysis of a naturally occurring gas hydrate from sediment of the Gulf of Mexico

Davidson, D. W.; Garg, S. K.; Gough, S. R.; Handa, Y. P.; Ratcliffe, Christopher I.; Ripmeester, John A.; Tse, John S.; Lawson, W.F.

doi:10.1016/0016-7037(86)90110-9

Cited by 213 publications

(120 citation statements)

References 9 publications

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“…This microbial methane in sI hydrate had migrated a short distance or had been generated by in-situ methanogenesis 15 . In contrast, hydrocarbons larger than ethane are characteristic of thermogenic hydrocarbons, and they form sIIand sH-type hydrates 12,17 . Thermogenic hydrocarbons are generated by the decomposition of organic matter deep below the seafloor at temperatures above ~100 °C (refs 34, 35), and they migrate to the seafloor through faults and mud volcanoes 36,37 .…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, mud volcanoes are situated in active areas of plate boundaries and in zones of young orogenic structures. Thermogenic gas hydrate deposits are abundantly distributed in these active areas in association with faults and mud volcanoes 36 ; for example, the Gulf of Mexico 16,17,39 , the Cascadia margin 12,38 , the Black Sea 42 , the Barbados accretionary prism 34 , the Costa Rica forearc 48 , the Gulf of Cadiz 35 and the Mediterranean Sea 49 . Accordingly, hydrocarbons contained in thermogenic gas hydrates and those contained in chibaite and DOH-type mineral are of the common origin, which is the thermal decomposition of organic matter in deep sediments.…”

Section: Discussionmentioning

confidence: 99%

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New silica clathrate minerals that are isostructural with natural gas hydrates

Momma

Ikeda

Nishikubo³

et al. 2011

Nat Commun

131

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silica clathrate compounds (clathrasils) and clathrate hydrates are structurally analogous because both materials have framework structures with cage-like voids occupied by guest species. The following three structural types of clathrate hydrates are recognized in nature: cubic structure I (sI); cubic structure II (sII); and hexagonal structure H (sH). In contrast, only one naturally occurring silica clathrate mineral, melanophlogite (sI-type framework), has been found to date. Here, we report the discovery of two new silica clathrate minerals that are isostructural with sII and sH hydrates and contain hydrocarbon gases. Geological and mineralogical observations show that these silica clathrate minerals are traces of lowtemperature hydrothermal systems at convergent plate margins, which are the sources of thermogenic natural gas hydrates. Given the widespread occurrence of submarine hydrocarbon seeps, silica clathrate minerals are likely to be found in a wide range of marine sediments.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

New silica clathrate minerals that are isostructural with natural gas hydrates

Momma

Ikeda

Nishikubo³

et al. 2011

Nat Commun

131

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“…9,12) The most popular explanation of the self-preservation effect assumes a kinetic barrier for methane diffusion through the ice film of the surface of gas hydrate particles. 4,5,10,13) Large-scale nanosecond classical molecular dynamics (MD) calculations support this assumption (the formation of an ice layer inhibits the decomposition of gas hydrate). 14) However, as mention about, similar self-preservation effect was never observed in the experimental studies of the mixed methaneethane hydrate, 12) which does not support the ''kinetic'' approach of self-preservation effect.…”

Section: Introductionmentioning

confidence: 99%

“…3) This term describes the ability of methane hydrate to resist dissociation at temperatures higher than the equilibrium temperature of decomposition. The effect of incomplete dissociation of methane hydrate has been the subject of many experimental studies in the last years (see, for example [4][5][6][7][8][9][10][11][12][13] ). The experiments show the anomalous preservation of methane hydrate at temperatures below 273 K (ice Ih melting point) under ambient pressure with simultaneous formation of ice phase at temperatures above 242 K (beginning of methane hydrate dissociation).…”

Section: Introductionmentioning

confidence: 99%

Modeling the Self-Preservation Effect in Gas Hydrate/Ice Systems

et al. 2007

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Molecular dynamics simulations were performed to investigate the possible role of ice shielding in the anomalous preservation of gas hydrates. Two cases of ice shielding were considered: immersion of hydrate particles into bulk ice Ih and wrapping of similar particles in a thin ice shell. For a microscopic-level model of methane hydrate clusters immersed in bulk ice the excess pressure in the hydrate phase at 250 K was found to be sufficient to shift the gas hydrate into the region of thermodynamic stability on the phase diagram. For the second model the temperature dependence of various properties of the hydrate/ice nanocluster was studied. The surface tension estimates based on the Laplace equation show non-monotonic dependence on temperature, which might indicate the possible involvement of hydrate/ice interfacial phenomena in the self-preservation of gas hydrates.

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“…(the socalled self-preservation effect) above equilibrium temperature for hydrate breakdown, but below the H 2 O ice point. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The anomalous preservation of methane hydrate observed below the melting point of ice at 242-271 K 13,17) has potential application for temporary low-pressure transport, storage of natural gas and developing safe, dependable technologies to produce natural gas from methane hydrates. Recently, research of the preservation in pure methane and methane-ethane hydrates have shown extremely nonlinear temperature-dependence of methane hydrate dissociation behavior and the utter lack of comparable preservation behavior in CS-II methane-ethane hydrate.…”

Section: Introductionmentioning

confidence: 99%

Physical and Chemical Properties of Gas Hydrates: Theoretical Aspects of Energy Storage Application

et al. 2007

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A model has been developed permitting to accurately predict on molecular level phase diagram of the clathrate hydrates. This model allows to take into account the influence of guest molecules on the host lattice and to extend the interval of temperatures and pressures of computed thermodynamic potentials and significantly improves known van der Waals and Platteeu theory. The theoretical study of phase equilibrium in gas-gas hydrate-ice Ih system for methane and xenon hydrates has been performed. The obtained results are in a good agreement with experimental data. A new interpretation of so-called self-preservation effect has been proposed. The self-preservation of gas hydrates can be connected with differences in thermal expansions of ice Ih and gas hydrates. This is confirmed by calculations performed for methane and mixed methane-ethane hydrates.

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Laboratory analysis of a naturally occurring gas hydrate from sediment of the Gulf of Mexico

Cited by 213 publications

References 9 publications

New silica clathrate minerals that are isostructural with natural gas hydrates

New silica clathrate minerals that are isostructural with natural gas hydrates

Modeling the Self-Preservation Effect in Gas Hydrate/Ice Systems

Physical and Chemical Properties of Gas Hydrates: Theoretical Aspects of Energy Storage Application

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