FN Archimer Export Format
PT J
TI Empirical expressions for gas hydrate stability law, its volume fraction and mass-density at temperatures 273.15 K to 290.15 K
BT 
AF LU, Zhengquan
   SULTAN, Nabil
AS 1:1,2;2:1;
FF 1:PDG-DOP-DCB-GM-LES;2:PDG-DOP-DCB-GM-LES;
C1 IFREMER, Ctr Brest, Dept Marine Geosci, F-29280 Plouzane, France.
   Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China.
C2 IFREMER, FRANCE
   CAGS, CHINA
SI BREST
SE PDG-DOP-DCB-GM-LES
IN WOS Ifremer jusqu'en 2018
   copubli-int-hors-europe
   copubli-sud
IF 0.798
TC 22
UR https://archimer.ifremer.fr/doc/2008/publication-4958.pdf
LA English
DT Article
DE ;Empirical expressions;Mass density;Fraction out of pore space;Stability law;Gas hydrate
AB A series of empirical expressions for predicting gas hydrate stability, its volume fraction out of pore space and gas hydrate mass-density were established in different systems in consideration of gas composition (CH4, C2H6, H2S) and salinity (NaCl, seawater), and pore size at temperature between 273.15 and 300 K, based on our gas hydrate thermodynamic model (Sultan et al., 2004b, c). Six of the developed expressions for predicting gas hydrate stability were validated against the available published experimental data and they were also compared with other models. At temperature 273.15 to 290.15 K, the ARDPs (Average Relative Deviation of Pressures between the prediction and the experimental data) have shown that these empirical expressions are in agreement with the experimental data as well as other models, indicating their reliability of predicting gas hydrate stability for these systems. At higher temperatures, the empirical predictions for gas hydrate stability do not well reproduce the experimental data, because they are based on van der Waals model. The empirical expressions for predicting gas hydrate stability in the systems of CH4 + H2S + H2O, CH4 + seawater + poresize, CH4 + H2S + NaCl and CH4 + CO2 + NaCl, and for evaluating gas hydrate fraction and its density need further validation due to lack of available published experimental data. However, the empirical expressions for gas hydrate fraction and its density show that the effects of pore size and salinity are negligible; gas hydrate fraction will increase if methane concentration continuously increases relatively in excess of methane solubility and decreases with pressure within gas hydrate stability zone, which is well consistent with data of natural gas hydrates in Cascadia; gas hydrate density tends to increase with ethane percentage and decrease with pressure.
PY 2008
PD MAR
SO Geochemical Journal
SN 0016-7002
PU Terrapub
VL 42
IS 2
UT 000261047500003
BP 163
EP 175
ID 4958
ER

EF