Joint migration velocity analysis of PP- and PS-waves for VTI media

Cai, Pengfei; Tsvankin, Ilya

doi:10.1190/geo2012-0416.1

Cited by 8 publications

(2 citation statements)

References 28 publications

(15 reference statements)

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“…The interest in inverting for the vertical velocity of SV‐waves and Thomsen parameters from surface seismic data in VTI media increases with the development of multi‐component seismic processing and imaging in shale reservoirs (e.g., Thomsen ; Grechka et al . ; Cai and Tsvankin ). If we use only P‐wave surface data, however, it is known that the SV‐wave velocity cannot be estimated because the P‐wave anisotropic velocity is insensitive to the vertical velocity of SV‐waves (e.g., Alkhalifah ; Tsvankin and Thomsen ).…”

Section: Introductionmentioning

confidence: 99%

Generalized moveout approximation for P–SV converted waves in vertically inhomogeneous transversely isotropic media with a vertical symmetry axis

Hao

Stovas

2015

Geophysical Prospecting

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We present an overall description of moveout formulas of P–SV converted waves in vertically inhomogeneous transversely isotropic media with a vertical symmetry axis by using the generalized moveout approximation. The term “generalized” means that this approximation can be reduced to some existing approximations by specific selections of parameters, which provides flexibility in application depending on objectives. The generalized moveout approximation is separately expressed in the phase and group domains. All five parameters of the group domain (or phase domain) generalized moveout approximation are determined using the zero offset (or horizontal slowness) ray and an additional nonzero offset (or horizontal slowness) ray. We discuss the selection of parameters to link the generalized moveout approximation to some existing approximations. The approximations presented are tested on homogeneous, factorized, and layered transversely isotropic models. The results illustrate that utilizing an additional reference ray significantly improves the accuracy of phase‐domain and group‐domain moveout approximations for a large range of horizontal slownesses and source–receiver offsets.

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Section: Introductionmentioning

confidence: 99%

Generalized moveout approximation for P–SV converted waves in vertically inhomogeneous transversely isotropic media with a vertical symmetry axis

Hao

Stovas

2015

Geophysical Prospecting

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“…The development of a new processing, imaging, or inversion algorithm is initially tested on numerical modelling data due to the unpredictable factors encountered in field data (e.g., Dewangan and Tsvankin 2004;Cai and Tsvankin 2013). In addition to numerical modelling, physical modelling is another powerful tool when we study the elastic wave propagation in anisotropic media (Cooper et al 2010).…”

Section: Introductionmentioning

confidence: 99%

A multi‐azimuth seismic refraction study for a horizontal transverse isotropic medium: physical modelling results

Tseng

Chang

Liu

et al. 2017

Geophysical Prospecting

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A B S T R A C TTo investigate the characteristics of the anisotropic stratum, a multi-azimuth seismic refraction technique is proposed in this study since the travel time anomaly of the refraction wave induced by this anisotropic stratum will be large for a far offset receiver. To simplify the problem, a two-layer (isotropy-horizontal transverse isotropy) model is considered. A new travel time equation of the refracted P-wave propagation in this two-layer model is derived, which is the function of the phase and group velocities of the horizontal transverse isotropic stratum. In addition, the measured refraction wave velocity in the physical model experiment is the group velocity. The isotropic intercept time equation of a refraction wave can be directly used to estimate the thickness of the top (isotropic) layer of the two-layer model because the contrast between the phase and group velocities of the horizontal transverse isotropic medium is seldom greater than 10% in the Earth. If the contrast between the phase and group velocities of an anisotropic medium is small, the approximated travel time equation of a refraction wave is obtained. This equation is only dependent on the group velocity of the horizontal transverse isotropic stratum. The elastic constants A 11 , A 13 , and A 33 and the Thomsen anisotropic parameter ε of the horizontal transverse isotropic stratum can be estimated using this multi-azimuth seismic refraction technique. Furthermore, under a condition of weak anisotropy, the Thomsen anisotropic parameter δ of the horizontal transverse isotropic stratum can be estimated by this technique as well.

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Traveltimes and conversion-point positions for P-SV converted wave propagation in a transversely isotropic medium: numerical calculations and physical model studies

Tseng

Chang

et al. 2018

Exploration Geophysics

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Joint migration velocity analysis of PP- and PS-waves for VTI media

Cited by 8 publications

References 28 publications

Generalized moveout approximation for P–SV converted waves in vertically inhomogeneous transversely isotropic media with a vertical symmetry axis

Generalized moveout approximation for P–SV converted waves in vertically inhomogeneous transversely isotropic media with a vertical symmetry axis

A multi‐azimuth seismic refraction study for a horizontal transverse isotropic medium: physical modelling results

Traveltimes and conversion-point positions for P-SV converted wave propagation in a transversely isotropic medium: numerical calculations and physical model studies

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