330 km2
full fold 4D seismic data
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330 km2
full fold 4D seismic data
2560.52 km
prime line data
11.3 %
infill data
45
days - project duration
0
health and safety incidents, environmental incidents or damage/loss of equipment
Trident carried out their 2020 Ceiba/Okume 4D M3 survey over the actively producing Ceiba and Okume fields in Block G, offshore Equatorial Guinea. This survey represented the third monitor program conducted over the Block G development complex. The baseline surveys over Ceiba and the Okume Complex were acquired in1999 and 2003 respectively, with monitor surveys in 2010 and 2014. Polarcus, using their survey vessel M/V Polarcus Naila as the streamer towing and source vessel, performed the 4D seismic acquisition service. The support vessel Venture-G and chase vessel Emswind were chartered to provide additional support.
Existing infrastructure, including the platforms “Echo” and “Foxtrot” and nearby vessel movements in the Okume and Oveng area reservoirs, needed to be taken into account when planning and executing an efficient and safe survey
RPS designed the survey plan to mitigate the risk of aborting survey lines caused by conflicting activities, avoiding extra costs and delays.
During acquisition, RPS’ survey team use our customised Osprey 3D/4D seismic survey optimisation software to generate a visual overview of the project area and log activities in real-time. The team quickly identified unforeseen issues and managed them before they impact the operation.
Shooting plans were shared online, in real-time, keeping all parties up-to-date, informed and importantly safe.
RPS’ seismic quality control team used 4D pre plot (NavPlan) generation, onboard 4D repeatability analysis and line planning to ensure the quality of the data, the efficiency of the survey and take into account the obstructions and movements in the area.
While the survey was taking place, RPS’ onboard acquisition specialists delivered infield current and feather analysis, line planning, source repeatability analysis and (common midpoint) CMP repeatability analysis.
During seismic acquisition equipment failure, installation issues and operator mistakes can lead to erroneous data, or in the worst case, no data at all.
RPS mitigated this risk for Trident by conducting technical audits of the equipment to be used in their survey.
RPS geomatics specialists and seismic quality control specialists assured the quality of the positioning and acquisition data collected would meet Trident’s requirements.
During a seismic survey, the safety of people is always an ongoing concern. Fishing is essential to the livelihood of many people living on the coast of Equatorial Guinea. They fish with crews of two to four people in small artisanal canoes, made of dugout trees, wood planks or fibreglass, with outboard engines, using nets of 6 to 10 meters long. Constant communication in Spanish between the survey team and the local fisheries was required to protect the safety of the local people and their boats.
To ensure clear communication with local fisherman, RPS provided a Fisherman Liaison Officer (FLO) assigned to the chase boat, Emswind.
During the survey, the canoes were over shallow waters of the continental shelf and usually anchored. The fishermen were using hand lines, and they confirmed that no other types of fishing gear were being used in the project area.
During the survey, the fishermen were able to continue to fish safely.
The survey was managed successfully without incident. It was completed within the expected timeframe and budget, and Trident achieved all their operational objectives. A complete success!
Energy transition
Energy transition
Energy transition
Technical Director - Seismic Operations and Site Investigations
Global Operations MD (Energy)
Technical Director - Seismic survey optimisation and SIMOPS planning