Reservoir Imaging Ltd is drawing on its established expertise in ensuring the accuracy of 4D repeat seismic reservoir monitoring surveys to provide optimal positioning and QC for the large towed streamer spreads being deployed in Wide Azimuth (WAZ) surveys. In particular, WAZ surveys have source lines shot multiple times by source vessels: these have to be accurately plotted in the same way as the repeat lines in a 4D seismic survey. A further challenge is the need for feather-matching, a process which ensures that the varying degrees of ocean turbulence affecting the seismic recording cables on each line recorded can be accurately accounted for in the seismic data acquired.
Last year we launched its Osprey suite of QC technologies for 4D survey positioning accuracy and repeatability, which has been adapted and enhanced to deal with the complexities of WAZ acquisition. RIL personnel in the field perform the data quality control with all outputs loaded into a GIS database. The QC system incorporates mapping, source repeatability, coverage, and documentation. Results are made available via a Web-based GIS server which enables all the stakeholders to be involved in the decision-making process regarding the survey's progress.
WAZ Infield Personnel & QC
The WAZ specialist's role encompasses all parts of the project including pre-survey meetings, survey start-up, ongoing acquisition, infield QC and WAZ communications. The WAZ specialist will ensure the monitoring of all WAZ aspects of the survey including:
- Having full working knowledge of the WAZ plan before going to the field, and implement the plan using technology such as Osprey feather matching
- Performing all relevant WAZ QC as the survey progresses,
- Liasing with onboard crew, oil company representative, the contractor navigation department and the oil company acquisition/asset team throughout the project
- Updating the Web-based GIS server so all stakeholders can view and analyse the current status of the project
WAZ Remote Acquisition QC
RIL will provide an onshore QC system to monitor the WAZ acquisition. The system will incorporate mapping, source repeatability, WAZ based tile coverage and documentation.
P1/90 data acquired in the field will be uploaded to RIL for processing and analysis. At the agreed frequency a full set of WAZ attributes will be generated for analysis by RIL. The results will be uploaded to our Web based GIS server for immediate online access for all relevant stakeholders. Conference calls can be arranged at requested intervals to discuss the results in relation to the ongoing survey.