The SeisCal application operates within the well-section window (WSW) of the Petrel E&P software platform by displaying and then performing a 1D ray tracing on a seismic gather located near the displayed well. It calibrates anisotropic parameters (Thomson Delta, Thomson Epsilon) or generates them so you can test the effect of your changes on your model on a seismic gather located within the vicinity of the well. A dual scanning option also allows you to test the effect of any change on a defined range of depths.
Once activated, a prestack dataset (DIO format), the well at a location of interest, and respective well logs are loaded into the SeisCal application dialog box. These logs can be either physical logs from a well or a pseudo-well with extracted 1D parameter profiles from a velocity model.
Log types include velocity logs (compressional and shear), gradient logs (compressional and shear), and anisotropic parameters. The gather is displayed using a prestack gather track in the WSW. A prestack WSW renderer is included with the SeisCal application to provide this functionality.
- Calibrate 1D anisotropic and isotropic models
- Generate of anisotropic parameters
- Display and perform 1D ray tracing
Ray tracing tool
The SeisCal ray tracing tool visualizes the effect of modifying any of the utilized logs on the event quality (flatness) of the displayed gather. SeisCal contains a spreadsheet of log values and automatically updates to match any log changes. After a log modification, simply click to see the resulting change on the gather.
The SeisCal application allows the effect of changing parameters to be tested within a specific depth range without updating the logs. If satisfactory, dual-scan results can be applied to the logs and the results viewed on the seismic data. The revised logs can then be used to update an existing model or to expand a model from isotropic model to anisotropic. The SeisCal application is often used in conjunction with Seismic Velocity Modeling and Prestack Seismic Interpretation plugins, but these are not required.