Seismic and Microseismic Signatures of Fluids in Rocks: Bridging the Scale Gap

Sarout, Joël; David, Christian; Pimienta, Lucas Xan

doi:10.1029/2019jb018115

Cited by 8 publications

(4 citation statements)

References 45 publications

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“…The other important application concerns the subsoil mapping in estimating the thickness and elastic properties of the shallow sediment (Chavez-Garcia & Faccioli 2000;Harutoonian et al 2013;Mulargia & Castellaro 2016), and in constraining the basin structure (Hinzen et al 2004;Oliveto et al 2004;Borges et al 2016;Mulargia & Castellaro 2016;Bignardi 2017 Yassminh et al 2019). Gas reservoirs and geothermal fields are also investigated by HVSR techniques characterizing the impact of fluids on the attenuation/dispersion of the seismic waves (Sarout et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations in amplitudes and resonance frequencies of the HVSR amplification peaks linked to groundwater

Rigo

Sokos

Lefils

et al. 2021

Geophysical Journal International

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Following the installation of a temporary seismological network in western Greece north of the Gulf of Patras, we determined the quality of the sites of each of the 10 stations in the network. For this, we used the horizontal-to-vertical spectral ratio (HVSR) method and calculated an average curve over randomly selected days between 0 Hz and 10 Hz. The daily HVSR curve is determined by the HVSR 12-hour calculation (one hour every two) without distinction between seismic ambient noise and earthquake signal. The HVSR curves obtained can be classified in three categories: flat curves without amplification, curves with a amplification peaks covering a large frequency range, and curves with one or more narrow peaks. In this third category C3, one station has one peak, two have two, and one has three. On the contrary of what it is commonly assumed, the amplitudes and the resonance frequencies of these narrow peaks are not stable over time in C3. We determined the maximum of the amplitude of each peak with the corresponding central frequency for each day during 2.5 years. Except for the station with three peaks, which finally appears stable within the uncertainties, the principal peak exhibits a seasonal variation, with a maximum in winter and a minimum in summer, the observations being more dispersed during winter. The second peak, when it exists, varies in the same way except at one station where it varies oppositely. These variations are clearly correlated with the loading and unloading cycle of the underlying aquifers as shown by the comparison with water level and yield measurements from wells located close to the stations. Moreover, they are also correlated with the vertical surface displacements observed at continuously recording GPS stations. The dispersion of the observed maximum amplitude in winter is probably related to the rainfall and the soil moisture modifying the S-wave velocity as revealed by other studies. From this study, we would like to emphasize that the use the HVSR method to constrain the S-wave velocity and the thickness of the sediment layer over the bedrock in the basin, has to be done with caution. Upon further confirmation of its robustness, the HVSR methodology presented here could be a good and easy-to-use tool for a qualitative survey of the aquifer backdrop and its seasonal behaviour, and of the soil moisture conditions.

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Section: Introductionmentioning

confidence: 99%

Seasonal variations in amplitudes and resonance frequencies of the HVSR amplification peaks linked to groundwater

Rigo

Sokos

Lefils

et al. 2021

Geophysical Journal International

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“…The wave-induced fluid flow occurs in the presence of pore pressure gradients, which is predominantly caused by the heterogeneities either in the rock matrix or in the saturating pore fluids. For this reason, rock physical parameters such as rock permeability, pore structure, fluid viscosity, as well as fluid distribution are expected to be sensitive to seismic wave attenuation (Zhao et al, 2017;Sarout et al, 2019). Effects of these parameters on dispersion and attenuation have been, to a certain degree, experimentally investigated in recent years (Murphy, 1982;Yin et al, 1992;Batzle et al, 2006;Tisato and Quintal, 2014;Chapman et al., 2016; Spencer and Shine, 2016;Pimienta et al, 2017;Yin et al, 2019;Li et al, 2020b).…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, efforts must be made to precisely measure the dispersion and attenuation at seismic frequency bands and under varying physical conditions. Due to the high requirement of precision and the complexity of laboratory measurements, there are limited teams capable of conducting low-frequency measurements so far (Spencer, 1981;Batzle et al, 2006;Tisato and Quintal, 2013;Pimienta et al, 2015Pimienta et al, , 2019Mikhaltsevitch et al, 2016;Li et al, 2020a). The most prospecting method in low-frequency measurements is the forced-oscillation technique, allowing measurements over a wide frequency range and under varying physical conditions.…”

Section: Introductionmentioning

confidence: 99%

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

Wei

Wang

Han

et al. 2021

Adv. Geo-Energy Res.

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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 two sandstones under both dry and partially water-saturated conditions at frequencies ranging from 2 to 600 Hz. Two samples, Bentheimer and Bandera sandstones, have similar porosity of ∼20% but different permeability of 1830 mD and 33 mD. 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. Because of the high compressibility of gas, even a few percent of gas (∼5%) 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. However, when the sample is approaching a fully water-saturated condition (gas saturation <5%), the gas effect gradually decreases. Instead, the 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.

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“…The study of dynamic responses of fluid‐saturated porous media has become more and more popular in engineering practices. Petroleum engineers have been using seismic monitoring to detect dynamic responses of subsurface rocks during hydraulic fracturing 31 . Geophysicists are more interested in the effects of pore fluids on wave dispersion and attenuation 32 .…”

Section: Introductionmentioning

confidence: 99%

Fundamental solutions to the transversely isotropic poroelastodynamics Mandel's problem

Liu

2021

Num Anal Meth Geomechanics

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Many geomaterials, such as shale, and biomaterials, including human bone and cartilage, are anisotropic. Understanding the dynamic responses of such anisotropic porous media is essential in field operations and laboratory measurements. This paper presents analytical solutions to the transversely isotropic poroelastodynamics Mandel's problem, using the Fourier transform method and Cardano formula to solve coupled six‐order partial differential equations. Potential applications of the solutions include explaining coupled fluid‐solid dynamics, validating numerical algorithms, and interpreting dynamic responses of anisotropic porous media. As an example, we apply the solutions to simulate a fluid‐saturated transversely isotropic Trafalgar shale specimen subjected to harmonic excitation. The simulation shows that pore pressure builds up as frequency increases. The buildup occurs at a lower frequency for a lower horizontal permeability. The amount of pore pressure buildup due to the Mandel‐Cryer effect is sensitive to material anisotropy. The porous material's effective stiffness reaches its periodic minimum and maximum at the resonant and anti‐resonant frequencies controlled by mechanical anisotropy and pore fluid.

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Seismic and Microseismic Signatures of Fluids in Rocks: Bridging the Scale Gap

Cited by 8 publications

References 45 publications

Seasonal variations in amplitudes and resonance frequencies of the HVSR amplification peaks linked to groundwater

Seasonal variations in amplitudes and resonance frequencies of the HVSR amplification peaks linked to groundwater

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

Fundamental solutions to the transversely isotropic poroelastodynamics Mandel's problem

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