RE: BP28 May 2026 18:47
Discoveries associated with the Sea Lion field: as well as the Sea Lion discovery, which Premier Oil and its partners are currently preparing for development, several other discoveries have been made on the eastern flank of the basin, including: Casper, Casper South and Beverley. Other discoveries were: the Liz field (wet gas/condensate and dry gas at a deeper level). The Liz condensate has a Condensate to Gas Ratio of 95 Bbl/MMscf. Shell identified strong gas shows in well 14/5-1 during drilling in 1998, but plugged and abandoned the well. It is characterised by the Falkland Islands Governemnt as a well with gas shows. Rockhopper (who subsequently acquired that acreage) reclassified the well as a gas discovery, which they call Johnson.
Two petroleum systems have been identified in the North Falkland Basin: one for oil and one for wet and dry gas. The oil is derived from lacustrine source rocks, while the gas is from a deeper fluvio-lacustrine source rock. Further analysis is needed to understand the deeper, gas-prone source rock. A deep source has also generated oil slicks observed north of the wells
Rockhopper reclassified Shell’s 1998 well (14/5-1A) as a gas discovery and named it Johnson after completing a Competent Person's Report (CPR). They achieved this by using new 3D seismic data shot in 2007, which identified a previously unmapped structural trap penetrated by the original well, validating the 165 meters of net gas pay Shell had recorded. [1]
Rockhopper Exploration utilized the following specific details and data to make this determination:
* New 3D Seismic Data: Rockhopper shot extensive 3D seismic in the North Falkland Basin in 2007. This mapping revealed a "previously unmapped structural closure" (the trap that holds the gas) that had not been fully recognized when Shell drilled the prospect.
* Confirmation of Net Gas Pay: Rockhopper's independent assessor, RPS Energy, reviewed the original final well report from 14/5-1A and confirmed Shell had encountered a massive 165 meters of net gas pay.
* Identification of the Source: Analysis of the data indicated the gas was likely generated by high-quality Jurassic or early Cretaceous source rocks, confirming a working petroleum system in licence PL032.
* Contingent Resources: By combining Shell's well data with their new seismic maps, Rockhopper established that the gas accumulation was a viable and distinct structural entity, reclassifying it as a Contingent Gas Resource ranging from 1.6 trillion to nearly 8 trillion cubic feet
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