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portada Effects on Seismic Properties
Type
Physical Book
Year
2011
Language
English
Pages
124
Format
Paperback
ISBN
3844387757
ISBN13
9783844387759

Effects on Seismic Properties

Perveiz Khalid (Author) · Lap Lambert Academic Publishing · Paperback

Effects on Seismic Properties - Perveiz Khalid

New Book Imported to Taiwan
Delivery: 03 Dec - 11 Dec Shipping: 14 to 15 business days.
NT$ 2,191
NT$ 2,191

Synopsis "Effects on Seismic Properties "

Two fluid-related sources of seismic attenuation andvelocity dispersion are examined: thermal relaxation,which originates from the contrasted temperaturevariations in the rock-forming minerals and in thesaturating fluid at the passage of the pressure wave;and the liquid-vapor phase transition in partiallysaturated rocks. An analysis of the relaxation timesshows that these processes are relevant in theseismic frequency band and drive the effective fluidcompressibility towards values higher than theunrelaxed values. Under full thermal relaxation between fluid and mineral, the effective compressibility is equal to the averageof the fluid adiabatic and isothermalcompressibilities weighted respectively by the heatcapacities of the fluid and mineral. On the otherhand, at the crossing of bubble point, in thelow-frequency regime a discontinuous variation influid compressibility exists. In these two relaxationprocesses, the difference in fluid bulk modulusbetween the unrelaxed and relaxed regimes, which isdirectly related to P-wave velocity dispersion, canbe as large as 0.5-1 GPa, depending on the fluid typeand gas saturation.

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