Evaluation and joint inversion of TTI velocity models with walkaway VSP in deep-water offshore Angola
- journal_title：The Leading Edge
- Contributor：Jinming Zhu ; Richard Perkins ; Pranab Sen ; Sharon Howe ; Ewan Hiller ; James Clough
- Publisher：Society of Exploration Geophysicists
- Date：2013-02-01
- Format：text/html
- Language：en
- Identifier：10.1190/tle32020194.1
- journal_abbrev：The Leading Edge
- issn：1070-485X
- volume：32
- issue：2
- firstpage：194
- section：Case study
摘要
We present a case study where a multitude of walkaway vertical seismic profiling (WVSP) data was employed in evaluating the accuracy of anisotropic velocity models used in a prestack depth migration (PSDM) project. We integrated the WVSP traveltimes with surface seismic PSDM residual moveout on migrated common-image gathers (CIG) in a joint inversion that determined the anisotropic model parameters. The resulting anisotropic model significantly reduces the mis-ties between the modeled and observed first arrivals in the various WVSP lines, in addition to the enhancement in CIG flatness and significant im-provement in imaging.