NORSAR Synthetic 3D Seismic

Seismic cross-section

An Inline of the resulting synthetic 3D seismic along with the surfaces (stippled) from which it was generated. Notice how the steeply dipping faults are not illuminated using the current Migration half aperture (500 m). Increasing the Migration half aperture will give a better illumination of the faults.

Plug-in Overview

The plug-in generates synthetic migrated 3D seismic that incorporates 3D illumination and resolution effects from seismic aperture, overburden and reservoir using a patented method called SimPLI (Simulated Prestack Local Imaging). Having interpreted surfaces from a real 3D seismic (and possibly also having found an estimate of the Reflection coefficients along the surfaces) it is useful for quality control purposes to generate synthetic 3D seismic from the surfaces and compare it with the real 3D seismic. The synthetic 3D seismic is generated using a 3D convolution process. Unlike 1D convolution, that is common in industry, our process takes into account the effect of lateral resolution and that some dips may not be illuminated. It is possible to vary reflection angle, thus predicting AVO/AVA effects.

Specifications

• Creates new synthetic 3D seismic
• Uses interpreted surfaces or interpreted model horizons
• Uses active velocity model in Petrel
• Reflection coefficients can be computed with Rock Transform using specified rocks and properties from the model
• Using a set of rock templates, rocks can be created and modified
• Uses a wavelet

Features

• Fast 3D convolution takes into account illumination and resolution effects
• Industry standard 1D convolution also implemented for comparison purposes
• Depending on input can generate synthetic 3D seismic either in Domain Elevation time or Elevation depth
• Can take into account Reflection coefficients if known, but works also with defaults
• Migration half aperture is user defined