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Theme IV-11: Gas
Hydrates: Role in Past and Future – Prof. F.A. Kuznetsov (Russia)
Presentation abstracts
will appear here as soon as possible.
Natural gas hydrates
occur world-wide in polar regions associated with onshore and
offshore permafrost, and in ocean sediments along continental
margins at depths greater than one hundred meters provided, bottom
waters are sufficiently cold. The shallowness of the gas hydrates
zone of stability makes them vulnerable to surface disturbances
(warming of ocean, drop in sea-level, increase or decrease of
the polar ice-cap, oceanic circulation). Consequently, gas hydrates
may have played a significant role in modifying the composition
of the atmosphere during ice ages. This Session aims to depict
the state of the art in the following topics :
- gas hydrates as
natural fossil fuel resource potential;
- world-wide estimation
of reserves in gas hydrates;
- role of gas hydrates
as a submarine geohazard;
- gas hydrates potentiality
of "greenhouse" feedback in climate forcing and their effects
on global climate change (glaciation and deglaciation);
- the global C cycle
with and without gas hydrates;
The thermodynamic conditions
of stability or metastability, the past and current P-T world-wide
conditions at the bottom of the sea, and the time scales involved,
among others conditions, make the estimation of world-wide reserves
difficult. Different aspects need to be critically evaluated in
order to understand the significance of gas hydrates in the natural
world. The expected contributions would cover all aspects of the
problems including thermodynamic studies, stability of gas hydrates,
experimental results, reference databases, global C cycle, role
in climate forcing, but also specific examples, methods of exploration,
estimation of the global reserves and technology for exploitation.
It is expected to foster progress in international co-operation
in this most stimulating scientific area involving several disciplines.
Submitted abstracts
include:
Chlorine Stable Isotopes
Provide Estimates on Hydrate Abundance in a Submarine Gas-hydrate
Field and Possible Hints on the Chlorine Source
Reinhard Hesse, McGill University, Per K. Egeberg, Agder College,
Norway, Shaun Frape, University of Waterloo, Ontario
A Gas Hydrate Database
developed for the Internet.
J. Klerkx et al., Russia
Seismic inprints of
the Gas Hydrates in the Black sea and Mediterranean Sea.
G. Cifci, M. Ergum, D. Dondurer, Dokuz Eylul Univ. Turkey.
Natural Gas Hydrates-Present
and Future Iouri F. Makogon, Texas A&M University
Data Activity Related
to Natural Gas Hydrates in Russia
Fedor Kuznetsov, Institute of Inorganic Chemistry, Russian Academy
of Sciences
Geological, Geochemical,
and Geophysical Data Files, Concerning Submarine Gas Hydrates
V. Soloviev and G. Gherkashev-VINIIO Keangeologia, St. Petersburg,
Russia
Estimation of Distribution
of Gas Hydrate and free gas from log and seismic Data
Umberta Tinivella, Flavio Accaino, Angelo Camerlenghi, OGS, Trieste,
Italy
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