TomoPlus

GeoThrust has been designed with a workflow architecture to obtain an accurate earth model and earth image in time and in depth from data recorded with irregular geometry in areas with rough topography, complex near-surface, and complex subsurface, with uncompromisingly high technical specifications for data analysis and quality control, but easy to learn and easy to use. The near-surface model is estimated by nonlinear tomography applied to first-arrival times that accounts for topography and resolves lateral and vertical velocity variations. Aside from statics corrections, the corrections for the near-surface are performed by wavefield dating - an essential requirement for imaging from irregular topography. GeoThrust performs subsurface velocity estimation, modeling and imaging from topography, not from a flat datum, based on rms and interval velocities estimated at reflector positions, not at reflection positions.

Multisensor GeoStreamer is the ideal platform for broadband imaging. Deep towing reduces weather impact and improves acquisition efficiency. Recorded signal is insensitive to variations in towing depth or local sea-surface variations, significantly reducing non-repeatable noise on reservoir monitoring projects. Pre-stack amplitude and phase are consistent in an angle-dependent and frequency-dependent manner. Rich low-frequency signal enhances Full Waveform Inversion (FWI) and improves the accuracy of subsurface property prediction. Multisensor wavefield separation enables better shallow illumination. Near-surface images unaffected by acquisition footprint effects can be used for standalone interpretation. Enhanced broadband resolution of stratigraphy assists the recovery of small time shifts related to changes in reservoir saturation and pressure during reservoir monitoring projects. GeoStreamer uses both hydrophones and velocity sensors to remove all free-surface ghost reflections.