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Fracture Connectivity Effects on Seismic Attenuation
An important characteristic of fractured rocks is their very high seismic attenuation, which so far has been assumed to be mainly produced by wave-induced fluid flow between the fractures and the embedding matrix. As this fluid pressure equilibration process is strongly controlled by the hydraulic properties of the heterogeneous rock sample, the resulting seismic attenuation must also be expected to contain information about fracture connectivity. To date, however, the importance of fracture connectivity with regard to the observed seismic attenuation is largely unknown. Using numerical oscillatory compressibility simulations based on Biot's quasi-static poroelastic equations we show that an important, and as of yet non-documented manifestation of wave-induced fluid flow arises in the presence of fracture connectivity. We demonstrate that this additional energy loss is mainly due to fluid flow within the fractures and operates only in the presence of connected fractures. We also show that this phenomenon is sensitive to the lengths, permeabilities, and intersection angles of the fractures. Correspondingly, it contains key information on the governing hydraulic properties of fractured rocks and hence should be accounted for whenever realistic seismic models of such media are needed.
Fracture Connectivity Effects on Seismic Attenuation
An important characteristic of fractured rocks is their very high seismic attenuation, which so far has been assumed to be mainly produced by wave-induced fluid flow between the fractures and the embedding matrix. As this fluid pressure equilibration process is strongly controlled by the hydraulic properties of the heterogeneous rock sample, the resulting seismic attenuation must also be expected to contain information about fracture connectivity. To date, however, the importance of fracture connectivity with regard to the observed seismic attenuation is largely unknown. Using numerical oscillatory compressibility simulations based on Biot's quasi-static poroelastic equations we show that an important, and as of yet non-documented manifestation of wave-induced fluid flow arises in the presence of fracture connectivity. We demonstrate that this additional energy loss is mainly due to fluid flow within the fractures and operates only in the presence of connected fractures. We also show that this phenomenon is sensitive to the lengths, permeabilities, and intersection angles of the fractures. Correspondingly, it contains key information on the governing hydraulic properties of fractured rocks and hence should be accounted for whenever realistic seismic models of such media are needed.
Fracture Connectivity Effects on Seismic Attenuation
Rubino, J. Germán (author) / Müller, Tobias M. (author) / Guarracino, Luis (author) / Holliger, Klaus (author)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 41-50
2013-06-18
Conference paper
Electronic Resource
English
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