Journal ArticleDOI
Pore fluids and seismic attenuation in rocks
Kenneth W. Winkler,Amos Nur +1 more
TLDR
In this paper, the authors measured attenuation and velocities in resonating bars of Massilon sandstone at various degrees of saturation and found that shear energy loss simply increases with degree of saturation, whereas bulk compressional energy loss increases to ∼95% saturation and then rapidly decreases as total saturation is achieved.Abstract:
Seismic attenuation and velocities were measured in resonating bars of Massilon sandstone at various degrees of saturation. Whereas shear energy loss simply increases with degree of saturation, bulk compressional energy loss increases to ∼95% saturation and then rapidly decreases as total saturation is achieved. This behavior is analogous to the behavior of shear and compressional velocities, but the effect on attenuation is larger by an order of magnitude. Our observations are in excellent agreement with the predictions of several models of energy loss involving partial or total saturation. Pore fluid attenuation mechanisms are expected to be dominant at least in the shallow crust.read more
Citations
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Book
The Rock Physics Handbook: Tools for Seismic Analysis of Porous Media
TL;DR: In this article, the authors present basic tools for elasticity and Hooke's law, effective media, granular media, flow and diffusion, and fluid effects on wave propagation for wave propagation.
MonographDOI
The Rock Physics Handbook
TL;DR: The third edition of the reference book as discussed by the authors has been thoroughly updated while retaining its comprehensive coverage of the fundamental theory, concepts, and laboratory results, and highlights applications in unconventional reservoirs, including water, hydrocarbons, gases, minerals, rocks, ice, magma and methane hydrates.
Journal ArticleDOI
Seismic attenuation: Effects of pore fluids and frictional-sliding
Kenneth W. Winkler,Amos Nur +1 more
TL;DR: In this article, the effects of confining pressure, pore pressure, degree of saturation, strain amplitude, and frequency on seismic attenuation in sandstone bars were studied experimentally.
Journal ArticleDOI
Hydraulic and acoustic properties as a function of porosity in Fontainebleau Sandstone
Thierry Bourbie,Bernard Zinszner +1 more
TL;DR: In this paper, the authors measured the porosity of fine quartz grains with regular grain size (≈250 μm) with a falling head permeameter and found that the correlation between hydraulic properties and porosity is related to constant grain size, while the lack of correlation for acoustic properties emphasizes the importance of the microstructure.
Journal ArticleDOI
Stress relaxations at low frequencies in fluid-saturated rocks: Attenuation and modulus dispersion
TL;DR: In this article, the authors measured the complex Young's modulus of sandstone, limestone, and granite samples at frequencies between 4 and 400 Hz and at strain amplitudes near 10−7.
References
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Journal ArticleDOI
Theory of Propagation of Elastic Waves in a Fluid‐Saturated Porous Solid. I. Low‐Frequency Range
TL;DR: In this article, a theory for the propagation of stress waves in a porous elastic solid containing compressible viscous fluid is developed for the lower frequency range where the assumption of Poiseuille flow is valid.
Journal ArticleDOI
Viscoelastic properties of fluid-saturated cracked solids
TL;DR: The effective elastic moduli of a fluid-saturated solid containing thin cracks depend on the degree of interconnection between the cracks as mentioned in this paper, which can be estimated from the crack geometry or permeability.
Journal ArticleDOI
Computed seismic speeds and attenuation in rocks with partial gas saturation
TL;DR: In this paper, a 20 percent increase in compressional wave velocity between 1 and 100hz and attenuation of 27 db/1000 ft at 31 hz and 82 db/ 1000 ft at 123 hz was shown to be an important loss mechanism for heterogeneous porous rocks.
Journal ArticleDOI
The effect of saturation on velocity in low porosity rocks
Amos Nur,Gene Simmons +1 more
TL;DR: The shape of the pores in typical crystalline rocks plays an important role: increase in V p due to saturation of pores occurs when the pores are in the form of cracks but not when they are in a round hole as discussed by the authors.
Journal ArticleDOI
Dilatancy, pore fluids, and premonitory variations of ts/tp travel times
TL;DR: In this article, the travel time ratio of shear and compressional waves, ξ = t s /t p varies prior to the occurrence of earthquakes in the Garm region, USSR, and the subsequent increase of ξ, which terminates with an earthquake, can be caused by the flow of ground water into the dilated zone.