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Rarely do seismically defined subsurface structures translate directly into their depth equivalents. Being able to predict the subsurface depth structure accurately and consistently is critical to reliably estimating drilling costs. Transforming seismic time into subsurface depth meets with many technical challenges. VelPro provides comprehensive post-stack velocity modeling designed to seamlessly integrate seismic and well velocity information, horizons, faults, and well tops into a robust and data-driven velocity model.
VelPro's ease of use, flexibility and scalability helps interpreters and depth conversion experts build high-quality velocity models in record time.
VelPro offers a suite of tools designed specifically to solve the challenges of loading a host of well and seismically based velocity information quickly and easily into a project. Import tools for ASCII, SEGY, Velocity Data Bank and other industry standard seismic velocity formats are provided. The import/export suite also includes tools for loading horizons, faults, fault polygons, culture (including ESRI shape files), well locations, check shots, tops, directional surveys and curves (ASCII and LAS 2). The tools for importing ASCII information incorporate familiar to the industry paint-the-field techniques.
Once seismic and well velocity information is available within a VelPro project, a wide variety of tools deigned to help asset team members QC and condition their data is ready for use. The VelPro cross section tool will help interpreters quickly evaluate the quality of the seismic velocity data sets. Team members can interactively flip between interval, average or RMS velocity domains in either time or depth and progress through a volume quickly in order to best assess its value and accuracy.
Easy to use editors also provide a means for the inspection and QC of data quality problems interactively. Spurious data points may be discovered and dealt with before any subsequent activities are impacted by them. In many projects older seismic velocity data may have been loaded manually and may need to be subsequently edited. Check shots and time depth functions at wells may need to be reviewed and evaluated for consistency and accuracy within VelPro’s Function Editor. The Layer Analysis tool may reveal well misties that resulted from incorrect well tops or spurious well velocity information.
VelPro supports the integration of multiple seismic surveys at any scale. Single or multiple 2D surveys, single or multiple 3D surveys or any combination is as easy to accommodate as a single survey. Because of VelPro’s ability to interactively convert between time and depth and velocity domains, working with one dataset that originated in depth and others that originated in seismic time is seamless and transparent to the interpreter.
VelPro is designed to handle projects at any scale. Whether your project is at the prospect scale, at the regional scale or at the basin scale VelPro can handle it. If tying 2D regional lines together to reveal basin scale features is your challenge or if your challenge is tying a single 3D survey to well control, VelPro will scale to meet your needs. Even very large projects can be managed because of VelPro’s unique approach to building velocity volumes.
With the VelPro model in hand the final step will be to convert your data from time to depth or from depth to time. VelPro will handle this either within the VelPro project environment or will provide an industry standard SEGY version of the model for your use in other application suites.
The time to depth and depth to time modules can be used to convert horizons, faults, seismic trace volumes, grids or flat files.
Pre-stack depth migrations, more often than not, do not directly tie well control points. To accurately tie this type of data to well control often employs a technique known as “re-depthing”. VelPro supports multiple approaches to re-depthing.
Interpreters can convert the migrations back to time if the velocity field used in its migration is available. At this point a velocity model that precisely ties the wells can be constructed and then the data converted back to depth. Alternatively, the gridding tools within VelPro can be used to directly stretch and squeeze the depth data to fit the wells.
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