Equinor Awards 4D Seismic Survey Offshore Norway
Equinor has awarded PGS and Shearwater GeoServices framework agreements for 4D towed streamer seismic acquisitions on the Norwegian continental shelf. The agreements have a total estimated value of around NOK 700 million. PGS and Shearwater have been awarded generic framework agreements covering 4D seismic services on the NCS for a firm period of two years starting in 2021. The agreements include two two-year options and can also be applied for the UK continental shelf. PGS has also been awarded a specific framework agreement for 4D seismic services at the Gullfaks field. The agreement comprises an exclusive right to acquire up to three surveys prior to 2031.
PGS and Shearwater are Norwegian seismic suppliers with strong technical solutions, modern and well-equipped vessels and a good track record for Equinor.
The new agreements will create important activity for the suppliers. The offshore operations will be supported by PGS’s office in Oslo and Shearwater’s offices in Bergen and Gatwick.
In a seismic survey, sound pulses are emitted into the rock formations below the seabed. The sound waves are reflected back to sensors that are either placed on the seabed or towed behind a seismic vessel. In 3D surveys, seismic data are collected by several parallel sensor cables, providing a three-dimensional and more detailed image of the subsurface.
4D surveys consist of repeated 3D surveys of the same area in order to detect any changes in a reservoir over time as a result of production or injection. This is used to optimize production from the fields.