ELASTIC WAVE-EQUATION BASED SEISMIC MODELLING AND INVERSION FOR EVERYONE

Version 2.0.8 of the HELIOS software provides a valuable mix of new features, algorithmic changes and stability improvements.

The addition of a 2D data viewer now allows a quick analysis of the input data and inversion results without having to export and import volumes into a third party visualisation software. The new multi-location modelling module gives users the functionality to create linear and elastic 1.5D synthetics for an arbitrary number  of locations on  a 2D or 3D subsurface model. We then can replace a part of the subsurface model with a non-scattering low-frequency model while the potential impact of the shallow on deeper targets can thereby be simulated and analysed in a laterally varying environment rather than at a single location. 

While wave-equation based synthetic modelling is intrinsically performed in the ray–parameter domain, we have added the option to directly convert the ray–parameter gathers to offset or angle gathers. This provides a familiar domain for our users to undertake analysis of the elastic wave-propagation effects.

A major highlight of the latest release is the efficient memory implementation in our proprietary WEB modelling engine. This is a core aspect of the algorithm used throughout HELIOS and impacts synthetics, IMI displays and inversion. The memory requirements have been reduced by up to 95% and the algorithm runs over 20% faster. This continues the journey to make HELIOS even more accessible and gives our users scope to consider longer time and depth intervals without restrictions.

New features

• Multi-location synthetic modelling
• Data viewer update to 2D Data Viewer
• Horizon and well marker displays
• Conversion of ray-parameter synthetics to offset or angle gathers
• Extension of domain conversions (offset, angle, ray-parameter)
• Option to use RMS velocities as input to domain conversion
• Multi-file SEGY import
• Multi-file LAS import
• Option to display vertical depth axis in feet or meters
• Reflectivity plot added to synthetic modelling module
• Option to interactively change difference plot in synthetic modelling
• Wavelets sampling has been enhanced to allow 3ms sampling
• Statistical wavelet extraction over target interval

Algorithm changes

• Efficient memory implementation of WEB modelling engine

Stability improvements

• Resolved a problem when using a 2ms sampled wavelet
• Enhanced the user interface
• Improved the robustness of time-depth import functionality
• Resolved a problem that occurred when using inverse distance wavelet interpolation