Effects on Seismic Properties: Of Thermoelastic Relaxation and Liquid/Vapor Phase Transition

Effects on Seismic Properties: Of Thermoelastic Relaxation and Liquid/Vapor Phase Transition


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von Perveiz Khalid

Beschreibung

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.


Tags: Geowissenschaften


Taschenbuch - 9783844387759
Verlag: LAP Lambert Acad. Publ.
Ersterscheinung: August 2011
ISBN-13: 9783844387759
Größe: 220 mm x 150 mm x 7 mm
Gewicht: 201 Gramm
124 Seiten
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