Dynamic of gas hydrate deposits evolution under subaqueous conditions

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Datum:	2010
1. Verfasser:	Suetnova, E.
Format:	Artikel
Sprache:	English
Veröffentlicht:	Інститут геофізики ім. С.I. Субботіна НАН України 2010
Schriftenreihe:	Геофизический журнал
Online Zugang:	http://dspace.nbuv.gov.ua/handle/123456789/103090
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Назва журналу:	Digital Library of Periodicals of National Academy of Sciences of Ukraine
Zitieren:	Dynamic of gas hydrate deposits evolution under subaqueous conditions / E. Suetnova // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 175-176. — Бібліогр.: 4 назв. — англ.

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spelling	irk-123456789-1030902016-06-14T03:02:19Z Dynamic of gas hydrate deposits evolution under subaqueous conditions Suetnova, E. 2010 Article Dynamic of gas hydrate deposits evolution under subaqueous conditions / E. Suetnova // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 175-176. — Бібліогр.: 4 назв. — англ. 0203-3100 http://dspace.nbuv.gov.ua/handle/123456789/103090 en Геофизический журнал Інститут геофізики ім. С.I. Субботіна НАН України
institution	Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection	DSpace DC
language	English
format	Article
author	Suetnova, E.
spellingShingle	Suetnova, E. Dynamic of gas hydrate deposits evolution under subaqueous conditions Геофизический журнал
author_facet	Suetnova, E.
author_sort	Suetnova, E.
title	Dynamic of gas hydrate deposits evolution under subaqueous conditions
title_short	Dynamic of gas hydrate deposits evolution under subaqueous conditions
title_full	Dynamic of gas hydrate deposits evolution under subaqueous conditions
title_fullStr	Dynamic of gas hydrate deposits evolution under subaqueous conditions
title_full_unstemmed	Dynamic of gas hydrate deposits evolution under subaqueous conditions
title_sort	dynamic of gas hydrate deposits evolution under subaqueous conditions
publisher	Інститут геофізики ім. С.I. Субботіна НАН України
publishDate	2010
url	http://dspace.nbuv.gov.ua/handle/123456789/103090
citation_txt	Dynamic of gas hydrate deposits evolution under subaqueous conditions / E. Suetnova // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 175-176. — Бібліогр.: 4 назв. — англ.
series	Геофизический журнал
work_keys_str_mv	AT suetnovae dynamicofgashydratedepositsevolutionundersubaqueousconditions
first_indexed	2025-07-07T13:16:39Z
last_indexed	2025-07-07T13:16:39Z
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fulltext	�� !"# $ %& '( )�& �� �3� +,� �-.�,/�0 ��. �� 1��, ��0. 0� 0��,� �� Dynamic of gas hydrate deposits evolution under subaqueous conditions E. Suetnova, 2010 Institute of Physics of the Earth, RAS, Moscow, Russia elena_suetnova@mail.ru At present, more than 100 areas of gas hydrate manifestations in sediments have been revealed by various geophysical (mainly seismic) methods. Subsurface filtration is the most powerful process of gas and fluid transport into hydrate stability zone to form gas hydrate deposits in sediments [Davie, Buffet, 2002]. Pressures and temperatures favorable for the formation and stability of gas hydrates are widespread in seafloor structures, particularly, at continental margins, where accumulated sediments contain appreciable amounts of biological material, ensuring gas (mainly methane) influx into crustal fluids. Depths of hydrate stability interval and hy- drate saturation are different in natural conditions. These differences were interpreted usually in the frame of thermal regime peculiarity. Peculiarity of sediment accumulation processes was not consi- dered usually, but the sedimentation regime deter- mined the evolution of porosity, permeability, fluid pressure and filtration rate in accumulating sedi- ments [Suetnova, Vasseur, 2000]. Thus, to under- stand the mechanisms of accumulation and evolu- tion of hydrate deposits in sediments during geo- logical history it is necessary to study the complex geophysical process of porosity, filtration and hyd- rate accumulation evolution. The author’s recent results of numerical modeling of gas hydrate accu- mulation in dependence on geophysical condition of sedimentation are presented below. Methods and results. Gas and fluid filtration is determined by compaction during sediments pill growing, so, hydrate accumulation depends on se-dimentation and compaction history of sediments. Interrelated processes of filtration and visco-elastic sediment compaction during sediment column gro-wing are accounted for system of nonlinear differen-tial equations supplemented by appropriate boun-dary conditions [Suetnova, Vasseur, 2000]. The sys- tem was reduced to a dimensionless form in order to reveal its characteristic scales [Barenblatt, 1982]. The dimensionality analysis of parameters and vari- ables of the system reveals the compaction-related length L and time T scales characteristic of the prob- lem considered [Suetnova, Vasseur, 2000]. Thus, the system in the dimensionless form with these scales contains the dimensionless characteristic similarity numbers V=V0/ L/T, and DA��-˛ and, con-sequently, the depth and time distributions of the dimensionless porosity, the velocities of the sedi-ment matrix and pore fluid, and the hydrate con-centration, which are obtained as solutions of the system of equations, depend on these similarity numbers. Changes in the values of permeability, vis-cosity, and sedimentation rate alter the values of the characteristic similarity numbers of the com-paction process, controlling the fluid flow in sedi-ments [Suetnova, Vasseur, 2000]. Therefore, regu-lar patterns of accumulation of gas hydrates in a growing layer of sediments depending on their physi-cal and hydrodynamic properties and sedimenta-tion rates can be determined as a function of the similarity numbers of the problem of visco-elastic compaction. To reveal the dynamic of hydrate ac- cumulation the set of model calculation were per- formed using geophysical data on known hydrate regions. The influences of hydrate saturations on free pore volume and Damkohler number were ta- ken into account in the calculations [Suetnova, 2007]. Results of the calculations show that hydrate accumulation essentially influences on pore fluid fil- tration process. Calculations of time-dependent evo- lution of gas hydrate deposits show that the rate of hydrate accumulation is higher in the case of deve- loping overpressures compaction than in equilibri- um compaction process; provided that real sedimen- tation rate and final sediment thickness and over- burden pressure are equal in both case, but rheo- logical and hydrodynamic property are different (Fi- gure, Table). �� 32 �� !"# $ %& '( )�& �� �� Comparison of hydrate saturation versus distance from sedi- ment surface, normalized to sediment final thickness, result- ing after 2 m.years of sedimentation. Number of curve corre- sponds to the values of parameters, listed at table 1 at the same lines number. Conclusions. The results of modeling interrela- ted processes of sediment compaction, filtration and hydrate accumulation during geological history of sediment pile forming gives the theoretical and nu- merical base to understand the dependence of hyd- rate accumulation dynamic on mechanical and hy- drodynamic processes in sediments which deter- mined it’s dynamic during geological time. References Barenblatt G. I. Similarity, Self-Similarity, and Interme- diate Asymptotics. — Leningrad: Gidrometeoizdat, 1982. — 255 p. (in Russian). Davie M. K., Buffet B. A. A comparison of methane sources using numerical model for the hydrate for- mation. Proceeding of the 4 international confer- ence of gas hydrate. — Japan: Yokogama, 2002. — P. 25—30. Suetnova E. I. Accumulation of Gas Hydrates and Compaction of Accumulating Sediments: The Inter- action Problem // Dokl. Akad. Nauk. — 2007. — 415(6). — P. 818—822 (in Russian). Suetnova E. I., Vasseur G. 1-D modeling rock compac- tion in sedimentary basin using visco-elastic rhe- ology // Earth Planet. Sci. Lett. — 2000. — 178. — P. 373—383.

Dynamic of gas hydrate deposits evolution under subaqueous conditions

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