HybridVSPTM is READ patented combination of three component (3C) high temperature digital Vertical Seismic Profiling (VSP) array technology coupled with Distributed Acoustic Sensing (DAS) antenna to surface.
Standard wireline VSP arrays are limited by array length, which means that there is a trade off between reservoir coverage and image quality. On the other hand, DAS recordings can cover the entire well but are prone to noise and can not image steep dips near the well and lack directional information.
The individual limitations are removed and the benefits are enhanced by combing the two different methods. We merge the power of the proven 3C downhole electrical geophone with continuous acoustic measurements from the fiber optical cable to surface. The continuous fiber cable to surface is embedded in a custom wireline and we apply denoising acquisition methods to maximize the recorded acoustic signal. DAS recordings require maximum source energy and READ ’s BigDipperTM portable seismic source is optimized to direct energy towards the well in a 3DVSP spiral shoot.
The enormous data volume is handled by our new HybridVSPTM algorithms to generate compressional and shear wave 3D images, covering hundreds of square kilometers around the well. For marine HybridVSPTM, multiple migration gives a further 50% increase in lateral coverage and a true 3D cube to surface at a fraction of the cost of OBC or traditional surface seismic.
These specialized acquisition methods for 3D HybridVSPTM, together with new advanced data handling and imaging processes, have brought in a new era in 3D VSP technology. We triple the seismic coverage and provides an economical alternative to ocean bottom seismic.
- Complete well coverage to surface with one setting of system
- Save $Ms through reduced rig time
- Migrate 3D VSP multiples to generate large 3D image volumes
- Retrievable (wireline) or permanent options (PerForMTM)
- 300+ combined VSP levels
- Large image aperture with directional information
- Depth calibrated with conventional sensors
- Seamless integration with READ data acquisition and processing technology