Continuous Recording of Viscoelastic Relaxation Processes at a Constant Ultrasonic Frequency Due To Wave-Induced Fluid Flow in a Microporous Carbonate Rock

被引:3
|
作者
Geremia, Davide [1 ]
David, Christian [1 ]
机构
[1] CY Cergy Paris Univ, GEC, Cergy, France
关键词
dispersion; attenuation; patchy saturation; ultrasonic monitoring; carbonate rocks; P-wave; PARTIAL GAS SATURATION; FILLED POROUS ROCKS; WATER SATURATION; COMPRESSIONAL WAVES; WHITE MODEL; ATTENUATION; DISPERSION; PROPAGATION; VELOCITIES; ACOUSTICS;
D O I
10.1029/2021GL095244
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
In a set of water injection, imbibition and drying tests on the Obourg Chalk, relaxation processes induced by variations in water saturation were continuously recorded at a constant ultrasonic frequency, with a peak in attenuation concomitant to a velocity increase from a lower to an upper bound. This behavior is well described by standard viscoelastic models, considering a continuously changing relaxation frequency which at water saturation above 80% matches the frequency of our ultrasonic pulse generator. Using a patchy saturation model, we show that the heterogeneity in fluid distribution is responsible for this relaxation phenomenon which could be observed at the ultrasonic frequency, thanks to the very fine scale of the rock microstructure combining low permeability and high porosity. We believe that our detailed data set can feed new models or help improve existing ones for a better understanding of wave-induced fluid flow processes in reservoir rocks.
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页数:10
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