VelMod

VelMod™ provides a variety of velocity conversion, property conditioning and time to depth conversion tools for use within the Jason Workbench. VelMod is most often used when there is little or no well control available or when there are strong lateral variations in the velocity fields and the seismic velocity information reflects these variations. In addition, if a velocity model or file is available VelMod enables the creation of a Time/Depth Relationship which can be used within the Jason modules to convert on-the-fly between time and depth for key data types within Jason.

Velocity Model Building

VelMod includes three key modules: Velocity Conversion, Property Conditioning and Time to Depth conversion capabilities.

Velocity Conversion

The Velocity Conversion module transforms one velocity domain into another. Stacking velocities can be converted to interval velocities and vice versa. Average velocity data can be created from either interval or stacking velocity information. The module also provides a mechanism for editing the time datum for the selected velocity data file. The datum used in the conversion process can be set to either a constant or to a horizon.

Property Conditioning

VelMod’s property conditioning module can be used to edit or smooth not only velocity data sets but any property supported within the Jason Workbench. Two types of property conditioning, scatter correction and lateral smoothing tools, are included and either can be applied to help condition the data sets to behave within expected ranges and variations.

The Scatter Correction feature relies on a solid model created within the Jason environment. Using the solid model provides a mechanism for analyzing and correcting property data within those solid model layers. The tools found here include clipping, vertical interpolation and horizontal interpolation algorithms which can be applied to remove or replace outliers in the data sets with values interpolated from its nearest neighbors.

The Lateral Smoothing feature is applied to reduce trace to trace variations in a property data set. This feature also utilizes a solid model for analyzing and correcting property data within solid model layers. The smoothing operator generates a scale factor for each trace based on layer averages vertically and spatially within each layer. This scale factor is then applied to all the samples in that layer.

Time Depth Conversion

The Time Depth Conversion (TDC) module performs multiple functions within the Jason environment. Using seismic velocity files or models, the TDC module can be used to convert time based data to depth or vice versa. In addition the TDC module can also be used to create a Jason TD Relationship file that can be associated with a variety of data types. This association can be used within the Jason environment to perform on-the-fly time to depth conversions of a