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Dispersion and Attenuation for the Drained/Undrained Transition - Modelling the ExperimentNormal access

Authors: L. Pimienta, J. Borgomano, J. Fortin and Y. Guéguen
Event name: 78th EAGE Conference and Exhibition 2016
Session: Rock Physics I
Publication date: 31 May 2016
DOI: 10.3997/2214-4609.201600801
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.58Mb )
Price: € 20

The frequency effects in rocks have been theoretically shown to originate from fluid flow at different scales. In order to check experimental results recently reported, a 1D poroelastic model has been developed. Four properties may be predicted using the model: the rock elastic response, in terms of bulk modulus and attenuation, and the hydraulic response, in terms of fluid over-pressure and phase shift. This model aims at better understanding and comparing the experimental measurements. Two aspects are addressed by the model’s predictions: the comparison between local and global measurements, and the role of the boundary conditions on the measurement. It is shown that, for a given rock submitted to the same experimental conditions, global and local measurements will lead to different results. Moreover, the dead volume at both sample’s ends is shown to strongly affect the results obtained under fluid saturation at lowest frequencies.

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