About Gamma ratios and their combinations

Garotta, Robert; Granger, Pierre‐Yves; Audebert, F.

doi:10.1190/1.1818051

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…To enable comparisons between datasets, PS data can be squeezed to PP time using an estimation of the P-velocity to S-velocity (gamma) ratio. Several techniques are available to estimate this key value, based on optimal correlation between opposite azimuth stacks or derived from transit times as explained by Garotta et al (2003). In this paper we describe how we can take advantage of the correspondences between PP and PS datasets, enabled by a first estimate of the gamma ratio to build a method for a simultaneous joint inversion of surface-consistent corrections for PP and PS datasets.…”

Section: Introductionmentioning

confidence: 99%

Surface-Consistent Amplitude Simultaneous Joint Inversion for PP and PS Data

Henin¹,

Garceran²,

Meur³

et al. 2014

Proceedings

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Surface-consistent amplitude corrections are commonly used to correct for the amplitude variations due to nearsurface conditions in land processing. Usually, the corrections for PP and PS datasets are computed separately. There are, however, sound geophysical reasons why a subset of these scalars should be common or shared between PP and PS data. The simultaneous joint estimation of the source and receiver correction scalars for PP and PS datasets that we propose is a way to ensure the consistency of the surface-consistent corrections for both datasets. It also enables a better estimation of the source term which must be identical for PP and PS traces originating from the same shot to be in accordance with the surface-consistent model. When performing surface consistent amplitude corrections of PS datasets, only the radial projection is usually used for the estimation of surface-consistent scalars. As regards the simultaneous joint inversion we also investigated the use of the transverse projection in addition to the radial projection for completeness.

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Section: Introductionmentioning

confidence: 99%

Surface-Consistent Amplitude Simultaneous Joint Inversion for PP and PS Data

Henin¹,

Garceran²,

Meur³

et al. 2014

Proceedings

View full text Add to dashboard Cite

show abstract

“…In isotropic materials, the conversion point is shifted toward the receiver -closer as V P /V S increases. However, if the Earth displays vertical transverse isotropic (that is, VTI where velocity varies with angle from the vertical, but not around the vertical), then the conversion point can be displaced toward the mid-point (Thomsen, 1999;Garotta et al, 2003). Most multicomponent processing companies provide VTI assessment as a routine service (as well as analysis of horizontal transverse isotropy, HTI, where the velocity varies with azimuth).…”

Section: Introductionmentioning

confidence: 99%

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2004

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About Gamma ratios and their combinations

Cited by 2 publications

References 6 publications

Surface-Consistent Amplitude Simultaneous Joint Inversion for PP and PS Data

Surface-Consistent Amplitude Simultaneous Joint Inversion for PP and PS Data

Preview Number 108

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