When the relative simplicity of the subsurface does not warrant depth migration, pre-stack time migration (PreSTM) solutions will often suffice. The foundation of our technology is two of the leading names in PreSTM – GX Technology (GXT) and AXIS Geophysics.
AXIS specializes in high resolution, 2D and 3D stratigraphic imaging based on PreSTM. Well and seismic information are tightly integrated across the processing workflow to ensure the final rendered images will be interpretation ready. AXIS PreSTM techniques deliver very high resolution velocity information, laying the foundation for superior AVO, inversion, and pressure prediction and generally improving the final seismic images.
GXT has developed an amplitude-preserving Kirchhoff PreSTM routine that is ideal for imaging complex geologic conditions or velocity fields. The GXT methodology is not constrained by the straight ray approximation of most commercial PreSTM software packages. Instead, a turning ray approach is used that can image very steep or overturned seismic events. Capable of accounting for ray bending at angles up to 150°, GXT’s technique ensures there is no bias in the velocity estimates or in the positioning of steep dips.
The PreSTM algorithms used by GXT offer superior amplitude and bandwidth preservation. The results are better event coherency, improved lateral resolution, and gathers that are ideally suited as inputs into AVO analysis, especially in areas of complex geology.
