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Geology & Geophysics

TGS plans to reprocess approximately 15,616 sq kms of legacy 3D seismic data in the Liberia Basin. (Image source: TGS)

Energy data and intelligence provider TGS has collaborated with the National Oil Company of Liberia (NOCAL) to expand data access offshore Liberia

TGS will work to rejuvenate the existing legacy 2D and 3D datasets in Liberia's prospective Liberia and Harper Basins, aspiring to reach high subsurface clarity. 

This will help build a unified velocity model in depth, utilising cutting-edge imaging algorithms to produce the final migrated seismic data, which can prove crucial for prospectivity studies in Liberia's offshores.

The company has initiated this campaign since 2022, after the Liberia Petroleum Regulatory Authority (LPRA), in cooperation with NOCAL, opened direct exploration licensing negotiations for all offshore blocks over the Harper and Liberia basins in 2021. An already reprocessed 2D legacy seismic of approximately 12,097 kms is available for industry licensing.

Benefitting exploration

"At TGS, we are proud of our longstanding and successful partnership with Liberia, which we believe presents considerable offshore hydrocarbon opportunities. This high-quality 2D seismic data will be essential in promoting future licensing rounds offshore Liberia under a direct negotiation approach. It also allows E&P companies to further evaluate exploration opportunities in an under-explored but proven petroleum system adjacent to prolific hydrocarbon provinces," said David Hajovsky, executive vice-president of global multi-client at TGS.

Since Liberia's Petroleum Law came into effect in 2019, investment conditions were relaxed and more time frame for exploration was allowed. The reprocessed products by TGS add to the exploration prospects in the region with its consistent, continuous data set of several vintages, providing uninterrupted seismic attributes of higher confidence at target levels across the entire margin.

TGS has now taken on to the second phase to reprocess an additional 12,675 line kms over the Liberia and Harper Basins, bringing the total to over 24,700 kms.

Additionally, the company plans to reprocess approximately 15,616 sq kms of legacy 3D seismic data in the Liberia Basin. 

A thorough geophysical scanning might have more to reveal from the historic wells drilled and operated on the Tobias field in KON-11. (Image source: Adobe Stock)

Exploration and production company Corcel PLC has noted the suspension of drilling and well testing activities in KON-11, with focus now shifting on collecting and studying geological and geophysical data from the area

This comes following multiple weeks of challenging well testing and engineering efforts that involved reactivation of the fractured carbonate reservoirchallenging well testing and engineering efforts that involved reactivation of the fractured carbonate reservoir, but with minimum yeild results. A thorough geophysical scanning of the region, however, might have more to reveal from the historic wells drilled and operated on the Tobias field in KON-11.

The block partners are hence considering subsurface conditions to understand the natural fracture system characteristics, trying to identify formation damage and residual issues with water inflow. 

Key commercial asset

Reaffirming Angola as a key commercial asset, Corcel executive chairman Antoine Karam said, "While initial results in Angola have not allowed immediate reactivation of the Tobias Field as originally hoped, the block partners are undertaking a detailed review of how to best utilise and exploit the two wells recently completed and further develop the full potential of the block. The company and its block partners believe KON-11 continues to offer significant developmental potential and that these early testing results are by no means a definitive outcome.

"Activities are accelerating at the company's operated block, KON-16, which we believe offers substantial upside and an attractive exploration risk/return profile.

"While the company continues to actively review new projects as part of the normal course of business, Corcel's interests in Angola remain key commercial assets for the company and we and our block partners believe that further development will add significant value to our respective businesses as our three blocks are advanced.

"Meanwhile, the company intends to host an investor event covering its current plans and strategy in the near term, with further details to be provided."

The company is positive about the identified potential of the Tobias reactivation effort, and KON-11 more broadly, remains significant, and that these early results will both usefully inform next steps and lead the block partners to ultimate commercial production in the block.

Activities at KON-16 during 2024 are expected to focus on G&G studies as well, including review of existing seismic data, a review of the historic Tuenza-1 well which had oil shows in the pre-salt level and associated petrophysical analysis. The immediate goal of these efforts is to prepare an updated prospect and lead table for consideration by the block partners.

The company believes that KON-16 offers sizeable upside in the form of 1,029 MMbo unrisked recoverable leads in the pre-salt, where the Tuenza-1 well (1960) was historically drilled on the block and oil and gas was found bleeding from the core in the Cuvo formation.

 

Encouraging imaging in the pre-Messinian section is already apparent in this pseudo relief image from the early-out KPSDM full stack volume through Merneith & Luxor MC3D. (Image source: PGS)

PGS has announced that early-out data is now available for the EGY23 Merneith & Luxor MultiClient programme 

It took a total 166 hours to complete the remote operation in the shallow waters of Nigeria. (Image source: Adobe Stock)

In a first, the Shell Petroleum Development Company of Nigeria Ltd (SPDC) has taken the optimisation route by deploying an uncrewed surface vessel (USV) for a pipeline survey at Bonny, Niger Delta 

The latest in a series of PGS surveys offshore Egypt will enable better understanding of shelfal and transform margin potential at the western extremity of Egypt’s offshore area 

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