Seismic wave propagation in Kelvin visco-elastic VTI media

Lu, Jun; Wang, Yun

doi:10.1007/s11770-010-0256-y

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Generally, current researches on the P-wave quality factor of coal are more than on S-wave and much less studies their anisotropies because the downhole multi-component seismic technology has not been applied on a large scale yet. In theory, studies on the attenuation characteristics and variations of P-and S-wave coal quality factors are significant for improvement of the accuracy of coalfield seismic exploration, prevention of gas and coal outbursting and the detection of geologic structure and lithology (Lu et al, 2010). In this work, based on a lab ultrasonic measurement of 6 metamorphic kinds of coals, we analyzed the relations between maximum vitrinite reflectance and P-and S-wave quality factors.…”

Section: Introductionmentioning

confidence: 99%

Quality Factor Characteristics of Six Metamorphic Kinds of Coal in China

Wang

Meng

2014

Chinese J of Geophysics

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Lab ultrasonic measurements to metamorphic kinds of coal reveal the relation between the maximum vitrinite reflectance and ultrasonic quality factor. And then the relations between ultrasonic velocities and quality factors, including the anisotropic characteristics of quality factors are analyzed. The results show that there are good linear correlations between the maximum vitrinite reflectance and P-and S-wave quality factors, between velocities in direction perpendicular to seams and quality factors, and between the P-wave quality and S-wave's quality factors in direction vertical to seams. Moreover, there are stronger anisotropies in seismic quality factors than velocities. Comparison of the measured S-wave Q values with estimated values, based on a theoretical formula, indicates an only 7.2% relative error in this method. It proves that this theoretical formula can be applied to attenuation compensation of the converted shear wave in processing of multi-component seismic data.

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Section: Introductionmentioning

confidence: 99%

Quality Factor Characteristics of Six Metamorphic Kinds of Coal in China

Wang

Meng

2014

Chinese J of Geophysics

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“…Using elastic wave equation, wave fi eld propagating in complex medium also can be simulated (Che et al, 2010;Lu and Wang, 2010). Elastic wave equation can simulate full-wave field recording including reflected waves, converted waves, multiples, and so on, so the amplitude of the simulated wave fi eld has high accuracy.…”

Section: Introductionmentioning

confidence: 99%

Multi-wave amplitude-preserved AVO modeling considering wave propagation effects

Hou

Chen

et al. 2011

Appl. Geophys.

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Traditional AVO forward modeling only considers the impact of reflection coeffi cients at the interface on seismic wave fi eld amplitude and ignores various propagation effects. Introducing wave propagation effects including geometric spreading, transmission loss, attenuation into seismic wave propagation, multi-wave amplitude-preserved AVO forward modeling for horizontally layered media based on ray theory is proposed in this paper. We derived the multi-wave geometric spreading correction formulas for horizontally layered media in order to describe the geometric spreading effect of multi-wave propagation. Introducing the complex traveltime directly, we built the relationship between complex traveltime and quality factor without the help of complex velocity to describe the attenuation of viscoelastic media. Multi-wave transmission coefficients, obtained by solving the Zoeppritz equations directly, is used to describe the transmission loss. Numerical results show that the effects of geometric spreading, attenuation, and transmission loss on multi-wave amplitude varies with offset and multi-wave amplitude-preserved AVO forward modeling should consider the reconstructive effect of wave propagation on refl ection amplitude.

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Slowness vectors in viscoelastic anisotropic media and their physical interpretation and significance

Wang,

Zhou,

Greenhalgh

et al. 2024

GEOPHYSICS

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Under the high-frequency assumption, the slowness vector in a viscoelastic anisotropic medium is often defined by a complex-valued vector, whose direction is given by a complex unit vector that can hardly ever be simply explained by intuitive physical reasoning related to the actual seismic wave propagation direction. We extend the existing conjugate real ray-tracing (C-RRT) method to compute the ray velocity vectors, and then apply it to determine the slowness vectors for three body waves (qP, qSV, qSH) in a viscoelastic anisotropic medium. Moreover, we dissect the slowness vector with two physical specifications traveltime gradient and inhomogeneity components to reveal the physical significance of the slowness vector, and give illustrative examples of these components and the phase propagation (real traveltime) and wave-energy attenuation (imaginary traveltime) wavefronts of seismic waves. We also display the homogeneous and inhomogeneous components, as well as the inhomogeneity angles (or deviation angles between these two wavefronts) for the three body waves (qP, qSV, qSH) in a shale with different Q-factors. These results reveal the elusive link between the homogeneous slowness vector and the Q-factors of the medium. The theoretical and numerical dissections of the slowness vector and the extended C-RRT method are extremely helpful to understand seismic wave propagation and offer a ray-tracing method for the wave-energy compensation in seismic migration and reconstruction of subsurface images through seismic ray tomography in viscoelastic anisotropic media.

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Seismic wave propagation in Kelvin visco-elastic VTI media

Cited by 3 publications

References 15 publications

Quality Factor Characteristics of Six Metamorphic Kinds of Coal in China

Quality Factor Characteristics of Six Metamorphic Kinds of Coal in China

Multi-wave amplitude-preserved AVO modeling considering wave propagation effects

Slowness vectors in viscoelastic anisotropic media and their physical interpretation and significance

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