Each individual trace is examined and trace headers verified for the entire data volume prior to velocity filter wavefield separation and deconvolution. Velocity filtering is performed on the vertical channel only. Coherent noise such as shear waves can be reduced using a variety of filtering techniques.
If the input data quality is good, processing will result in a clean, high-resolution compressional wavefield. In deviated wells, we use earth-frame true vertical data.
Each trace is examined and trace headers verified for the entire data volume prior to data rotations. The x, y, and z axis traces are carried in the processing. Data rotations put the recorded x, y, and z data into an Earth reference frame, and appropriate wavefield separation would be applied to separate down- and upgoing P- and S-waves.
If data quality permits, then we apply Wavesip three-component wavefield separation based on parametric inversion to separate compressional and shear wavefields while simultaneously performing up and down separation. This is followed by deterministic deconvolution. Wavesip separation is applied if data quality permits and this is followed by deterministic deconvolution. PP and PS wavefields are processed independently.
Model building, tomography, and statics
Our integrated tools improve 3D model building, survey design, salt proximity analysis, and tomography.
Gtomo is our 3D tomography tool and includes flexible options for constraining model updates based on smoothness or layer exclusion. If a 1D earth model is appropriate, then additional functionalities are available, including 3D NMO correction and AVA analysis.
- ray-based Kirchhoff and generalized random transform (GRT)
- wave equation migration (WEM)
- reverse time migration (RTM).
Final deliverables for the migration include a 3D P-wave data volume migrated in depth SEG-Y format. If three-component processing is undertaken, followed by 3D migration, then a 3D PP wavefield, 3D PS wavefield volume migrated in depth, or both can be output in SEG-Y format. The corresponding two-way time (TWT) volumes are delivered as well.