TotalEnergies and BluEnergies Ltd. are advancing works aimed at idenfifying drill sites in blocks LB-26, LB-30, and LB-31 in Harper basin, offshore the West African nation of Liberia.

Seismic reprocessing, a multi-beam eco sounder survey (MBES), seabed geochemical sampling, and heat flow measurements are being conducted to help identify drillable prospects and assist in the selection of optimal drilling locations, the company said.

BlueEnergies said it expects reprocessing of the 3D seismic data set to enhance the seismic character, definition, and AVO content (direct hydrocarbon indicator) of the original 3D seismic survey completed by TGS ASA in 2013. The reprocessing is halfway complete. 

GeoPartners Ltd. is conducting a multi-beam eco sounder survey (MBES) over 4,045 sq km in 500-3,500 m of water. The MBES is designed to map underwater terrain, aiding in identifying sea bottom anomalies, supporting the safe selection of future drilling locations. More specifically, MBES identifies seabed geomorphologies (pockmarks, mud volcanoes, faults, etc.) and the presence of anomalous features (carbonates, outcrops, bacterial mats, etc.). It also performs water column imaging for the detection of anomalies related to seepage of hydrocarbons through the sea bottom. Data acquisition started on June 19, 2026, with expected completion in third-quarter 2026.  

Seabed geochemical sampling is being conducted through piston coring to collect evidence of migrated mature hydrocarbons (detection of fluorescent/natural oil compounds, hydrocarbon chromatography, thermogenic origin, etc.), and heat flow measurements are being performed to collect information about the relative sediment temperature and the thermal history of the undrilled Harper basin. Completion is expected by this year's fourth quarter, allowing for the integration of the data into a refined 3D data re-interpretation of the leads (basin floor fans) within the blocks, the company said.

Blocks LB-26, LB-30, and LB-31 cover an area of about 8,924 sq km, which is about 40% of Harper basin. The basin contains a Cretaceous deepwater fan play that shares the same source rocks and depositional environment as Stabroek block in Guyana on the conjugate margin, the company said.

Early first-quarter 2026, BluEnergies entered into an industry standard joint study and application agreement (JSAA) with the Liberian upstream subsidiary of TotalEnergies SE to further explore the prospectivity of the deep water fan play.

BluEnergies Ltd. holds a 35% interest and TotalEnergies holds a 65% interest in Reconnaissance License No. LPRA-003 overing contiguous blocks LB-26, LB-30, and LB-31.