Time-lapse seismic, also known as 4D seismic, and permanent reservoir monitoring (PRM) are techniques increasingly used by the oil and gas industry. Observing what is happening in the reservoir over time helps production engineers to maximise recovery rates.

While 4D and PRM technologies increase the amount and quality of seismic data that operators have at their disposal, processing it can sometimes be complicated by changing environmental conditions, such as water velocity and tidal height, that are experienced at the time each survey is conducted. If those conditions are accurately known, their negative impact on the accuracy of the 4D seismic images can be substantially mitigated.

Our Pressure Inverted Echo Sounder (PIES) help to resolve these issues by providing you with direct measurements of average water velocity and tidal height during and in between seismic acquisition projects.

PIES units deployed at multiple locations within the survey area are also used to provide lateral information related to average water velocity and tide height variations caused by changing sea currents and surface weather conditions.

remote data acquisition

During the period of instrument deployment, we can gather and transmit to shore data wirelessly, using our 6th Generation (Sonardyne 6G) acoustic communications technology within our Dunker 6 system kit, which can be vessel-based or mounted onboard unmanned surface vessel (USV) or autonomous underwater vehicle (AUV) platforms. We can also process the measured PIES data, so this information can be provided to you, when it is needed, without ever leaving the office.

PIES can also be hardwired into existing PRM infrastructure, to provide operators with instant and continuous access to their water velocity and tidal variation data.



We can support PIES installation from concept to deployment, data harvesting and analysis.