TechnologyPatented P-Cable 3D seismic acquisition system
P-Cable data provide very detailed horizontal imaging of fractures and faults. This figure shows polygonal faults visible as dark lines on a time slice through a P-Cable 3D cube. The data are compared with a time slice from conventional 3D seismic data where the faults are hardly resolved. Both datasets are TGS Clari-Fi™ processed.
Patented P-Cable Technology
The P-Cable system's main component is a cross-cable towed perpendicular to the steaming direction of the vessel (hence P-Cable). The cross-cable is spanned by two paravanes typically 150-300 m appart. The cross-cable provides power and communication of up to 24 active sections. The sections, manufactured by Geometrics Inc., are connected at either 6.25 or 12.5 m intervals to switches along the cross-cable. Group spacing of the active sections varies between 1.6 to 12.5 m.
Short offsets and dense streamer spacing result in dense CMP coverage with small bin sizes as low as 3 m. Combined with a high-frequency seismic source the effective vertical and spatial resolution is significantly increased. Compared to broadband-processed conventional 3D seismic the resolution is as much as four times better.
P-Cable data in comparison with conventional 3D. TGS Clari-Fi™ processed data.
Several different target areas may be acquired in a single survey by combining different acquisition modes of the P-Cable system.
The P-Cable system can used for both high-resolution 3D acquisition and 2D regional surveys. 3D acquisition gives high-resolution data in selected areas. When used for 2D, the wide-azimuth illumination and high-fold lead to crisp, detailed high-resolution 2D seismic profiles. By combining these modes, P-Cable can be used for both prospecting and exploration during the same survey. This both lowers survey expenses and illuminates the geological environment at different scales.
The unique cross-cable design enables quick deployment of the complete spread of eighteen streamers (assuming streamer length = 25 meters) in typically 1.5 - 2 hours, requiring only a small crew on deck. The system is designed for operation on medium sized vessels. This lead to both cost-effective operation and flexible survey planning. To date, P-Cable systems have been deployed from 15 different vessels.