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Combined effects of permeability and fluid saturation on seismic wave dispersion and attenuation in partially-saturated sandstone

Authors :
Qianqian Wei
Min Sun
Qi Huang
De-hua Han
Yang Wang
Source :
Advances in Geo-Energy Research, Vol 5, Iss 2, Pp 181-190 (2021)
Publication Year :
2021
Publisher :
Yandy Scientific Press, 2021.

Abstract

Knowledge of dispersion and attenuation is essential for better reservoir characterization and hydrocarbon identification. However, limited by reliable laboratory data at seismic frequency bands, the roles of rock and fluid properties in inducing dispersion and attenuation are still poorly understood. Here we perform a series of laboratory measurements on Bentheimer and Bandera sandstone under both vacuum-dry and partially water-saturated conditions at frequencies ranging from 2 to 600 Hz. At vacuum-dry conditions, the bulk dispersion and attenuation in Bandera sandstone with more clay contents are distinctly larger than those in Bentheimer sandstone, suggesting clay contents might contribute to the inelasticity of the rock frame. The partially water-saturated results show the combined effects of rock permeability and fluid saturation on bulk dispersion and attenuation. Even a few percent of gas can substantially dominate the pore-fluid relaxation by providing a quick and short communication path for pore pressure gradients. The consequent bulk dispersion and attenuation are negligible. Only as the samples are approaching fully water-saturated conditions, rock permeability begins to play an essential role in the pore-fluid relaxation. For Bandera sandstone with lower permeability, a partially relaxed status of pore fluids is achieved when the gas saturation is lower than 5%, accompanied by significant attenuation and dispersion. Cited as : Wei, Q., Wang, Y., Han, D., Sun, M., Huang, Q. Combined effects of permeability and fluid saturation on seismic wave dispersion and attenuation in partially-saturated sandstone. Advances in Geo-Energy Research, 2021, 5(2): 181-190, doi: 10.46690/ager.2021.02.07

Details

ISSN :
2208598X and 22079963
Volume :
5
Database :
OpenAIRE
Journal :
Advances in Geo-Energy Research
Accession number :
edsair.doi.dedup.....ea969bc10c722525d091e40eb32b3426
Full Text :
https://doi.org/10.46690/ager.2021.02.07