2D Tomographic velocity model building in tilted transversely isotropic media

Jiang, Fan; Zhou, Hua‐wei; Zou, Zhen; Liu, Hui

doi:10.1190/1.3255710

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…Axial velocity and layer geometry (Jiang et al, 2009) should be always treated as priority parameters for velocity model building. For crosswell acquisition, ε could be estimated accurately and should be considered as priority parameters.…”

Section: D Layered Model Tti Parameter Estimation Using Vsp First Armentioning

confidence: 99%

Traveltime inversion and error analysis for layered anisotropy

Jiang

Zhou

2011

Journal of Applied Geophysics

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Section: D Layered Model Tti Parameter Estimation Using Vsp First Armentioning

confidence: 99%

Traveltime inversion and error analysis for layered anisotropy

Jiang

Zhou

2011

Journal of Applied Geophysics

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“…The reflection traveltimes in TTI media vary with the orientation of the anisotropic symmetry axis ϕ (Tsvankin and Grechka, 2011). Jiang et al (2009) demonstrate the influence of symmetry axis orientation in tomographic inversion of the anisotropic parameters. The ϕ represents an extra parameter (along with V Po , ϵ and δ) to be recovered from moveout data (Tsvankin and Grechka, 2011).…”

Section: Introductionmentioning

confidence: 98%

Common-reflection-point migration velocity analysis of 2D P-wave data from TTI media

Oropeza

McMechan

2014

GEOPHYSICS

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We have developed a common-reflection-point (CRP)-based kinematic migration velocity analysis for 2D P-wave reflection data to estimate the four transversely isotropic (TI) parameters [Formula: see text], [Formula: see text], and [Formula: see text], and the tilt angle [Formula: see text] of the symmetry axis in a TI medium. In each iteration, the tomographic parameter was updated alternately with prestack anisotropic ray-based migration. Iterations initially used layer stripping to reduce the number of degrees of freedom; after convergence was reached, a couple of more iterations over all parameters and all CRPs ensured global interlayer coupling and parameter interaction. The TI symmetry axis orientation was constrained to be locally perpendicular to the reflectors. The [Formula: see text] dominated the inversion, and so it was weighted less than [Formula: see text] and [Formula: see text] in the parameter updates. Estimates of [Formula: see text] and [Formula: see text] were influenced if the error in [Formula: see text] was [Formula: see text]; estimates of [Formula: see text] were also influenced if the error in [Formula: see text] was [Formula: see text]. Examples included data for a simple model with a homogeneous TI layer whose dips allowed recovery of all anisotropy parameters from noise-free data, and a more realistic model (the BP tilted transversely isotropic (TTI) model) for which only [Formula: see text], [Formula: see text], and [Formula: see text] were recoverable. The adequacy of the traveltimes predicted by the inverted anisotropic models was tested by comparing migrated images and common image gathers, with those produced using the known velocity models.

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“…Zhou et al (2003) proposes a 3D reflection traveltime tomography that simultaneously inverts for the anisotropy parameters. Jiang et al (2009) develop a 2D TTI media traveltime tomography for crosshole and VSP geometry.…”

Section: Introductionmentioning

confidence: 99%

3D VTI traveltime tomography for near-surface imaging

Zhang

2013

SEG Technical Program Expanded Abstracts 2013

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Seismic first arrivals that propagate in the near surface area are affected by velocity anisotropy. With VTI assumption for the media, we develop a grid-based qP wave traveltime tomography method to invert Thomsen parameters, including  and at each grid point in the shallow area. In numerical experiments, we fix the symmetry axis velocity V p0 , inverting only  and . For single-parameter inversion, we invert  and  respectively, and for twoparameter inversion, we invert  and  simultaneously. Results indicate that  is better resolved than  from inverting the first arrivals.

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2D Tomographic velocity model building in tilted transversely isotropic media

Cited by 6 publications

References 14 publications

Traveltime inversion and error analysis for layered anisotropy

Traveltime inversion and error analysis for layered anisotropy

Common-reflection-point migration velocity analysis of 2D P-wave data from TTI media

3D VTI traveltime tomography for near-surface imaging

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