What is an undershoot seismic survey and why was it necessary offshore Nigeria?

An undershoot survey uses two or more vessels—one towing the seismic source and another towing streamers—to acquire seismic data directly underneath offshore platforms or FPSOs that a single vessel cannot navigate over. This method was necessary offshore Nigeria to image mature hydrocarbon reservoirs situated beneath existing deepwater production infrastructure without disrupting ongoing operations.

What strategic objective does TotalEnergies pursue with this survey?

TotalEnergies aims to de-risk near-field exploration prospects and identify optimal infill drilling locations adjacent to its established offshore facilities. This strategy allows the operator to tie new volumes quickly into existing infrastructure, maximizing asset profitability while minimizing new capital investment and emissions.

How does this development fit into broader West African upstream trends?

Deepwater operators across West Africa are increasingly prioritizing infrastructure-led exploration and enhanced recovery over capital-intensive frontier wildcats. Utilizing advanced seismic technology to prolong the productive lifespan of mature deepwater hubs has become a standard approach to maintaining cash generation across key regional portfolios.

Offshore Energy · May 29, 2026 (May 29) · 1 min read

Shearwater supports TotalEnergies and partner with survey in Africa

TotalEnergies SE

Isometric technical illustration of offshore oil and gas operations with drillship and support vessel — Illustration: TotalEnergies SE

Analysis

AI-assisted analysis · reviewed by Yuri Kan

Shearwater GeoServices has successfully executed a complex 3D towed streamer and undershoot seismic campaign for TotalEnergies and its joint-venture partners offshore Nigeria. The completion of this survey highlights continued upstream investment by European supermajors in mature West African deepwater assets. Deploying advanced undershoot techniques around existing offshore infrastructure will allow TotalEnergies to refine subsurface imaging for near-field exploration and potential infill drilling campaigns.

Key Facts

Shearwater GeoServices concluded a specialized 3D towed streamer and undershoot seismic survey offshore Nigeria.
The geophysical acquisition project was conducted on behalf of operator TotalEnergies and its joint-venture partners.
The campaign utilized undershoot seismic techniques to image subsurface reservoirs directly beneath existing offshore production facilities and infrastructure.
The data collected will support TotalEnergies' efforts to optimize brownfield development and de-risk near-field exploration targets in Nigerian waters.
The project forms part of a broader trend among international oil companies leveraging advanced geophysical imaging to extend the economic life of deepwater West African assets.

Background & Context

Nigeria remains one of Africa's primary hydrocarbon producers, but deepwater operators have increasingly prioritized high-return, low-risk near-field prospects over frontier exploration due to regulatory and capital constraints. TotalEnergies holds extensive production and exploration acreage across the Niger Delta and deepwater offshore basins, including key assets such as Egina, Akpo, and Usan. Acquiring accurate seismic data in congested production fields requires sophisticated dual-vessel undershoot operations to illuminate geological structures shielded by floating production storage and offloading (FPSO) units and platforms.

Market Impact

This survey marks an important technical milestone for TotalEnergies, enabling the operator to identify untapped reservoir pockets and optimize future infill drilling targets around existing infrastructure. By maximizing recovery rates from established deepwater hubs, the operator reduces the unit carbon intensity and capital expenditure associated with new barrel production. For Shearwater GeoServices, the successful deployment reinforces the robust demand for specialized ocean-bottom and undershoot seismic vessels in complex offshore operating environments. Furthermore, sustained technical investment provides a stabilizing signal to the Nigerian upstream sector as it seeks to maintain production quotas amidst shifting global capital allocations.

What to Watch

The acquired 3D seismic dataset will now undergo extensive processing and depth migration, a workflow typically requiring six to twelve months before interpretation can conclude. Following the delivery of processed imaging, TotalEnergies and its partners are expected to integrate the findings into upcoming reservoir management plans and finalize potential infill drilling candidates for 2025 and 2026. Industry observers will monitor whether the results prompt additional subsea tie-backs to sustain plateau production at TotalEnergies' Nigerian offshore hubs.

Frequently Asked Questions

What is an undershoot seismic survey and why was it necessary offshore Nigeria?: An undershoot survey uses two or more vessels—one towing the seismic source and another towing streamers—to acquire seismic data directly underneath offshore platforms or FPSOs that a single vessel cannot navigate over. This method was necessary offshore Nigeria to image mature hydrocarbon reservoirs situated beneath existing deepwater production infrastructure without disrupting ongoing operations.
What strategic objective does TotalEnergies pursue with this survey?: TotalEnergies aims to de-risk near-field exploration prospects and identify optimal infill drilling locations adjacent to its established offshore facilities. This strategy allows the operator to tie new volumes quickly into existing infrastructure, maximizing asset profitability while minimizing new capital investment and emissions.
How does this development fit into broader West African upstream trends?: Deepwater operators across West Africa are increasingly prioritizing infrastructure-led exploration and enhanced recovery over capital-intensive frontier wildcats. Utilizing advanced seismic technology to prolong the productive lifespan of mature deepwater hubs has become a standard approach to maintaining cash generation across key regional portfolios.

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