InVA: Interactive Velocity Analysis and QC

Rapid velocity analysis and advanced geostatistical velocity QC

Interactive velocity analysis (InVA) provides a full-featured interactive velocity analysis package for time-domain projects of any size. It includes conventional semblance, gather and mini-stack analysis, semiautomatic Toldi inversion picking, and extensive QC and mapping tools.

The latest version offers an updated traveltime generator to enable full ray-traced anisotropic moveout correction of gather displays. This provides consistency between moveout corrections in InVA and the WesternGeco proprietary Anisotropic Turning-wave Kirchhoff Prestack Time Migration.

This release also sees further improvements to interactive and automatic dual-parameter analysis for the generation of anisotropic (VTI) velocity fields. The eta field is saved for further interpolation or smoothing as necessary prior to application in Anisotropic Turning-wave Kirchhoff Prestack Time Migration or high-order anisotropic moveout.

Other key features of InVA include:

• Manual and automatic picking modes
• Semblance, gather, and mini-stack views
• Interactive velocity conditioning tools
• Efficient stack verification
• Angle mute overlays
• Full range of QC options and overlays
• Broad portfolio of high-order and anisotropic moveout algorithms
• Horizon-based options
• Vertical or time slice contour / post options
• Binning gamma analysis for P-S data
• Multiple prediction to guide velocity trends

InVA also incorporates the ability to define spatiality variant stacking mutes while picking velocities. This, coupled with the high-order dual-parameter velocity picking and fully ray-traced anisotropic moveout, means that a more precise spatially variant mute can be defined both quickly and easily.

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