Dana is reporting its preliminary technical assessment of the data gathered. This included over 40 sidewall cores, 11 fluid samples, extensive electric log data, including pressure measurements, and a vertical seismic profile. This information has now been analyzed and is being integrated with the existing 3D seismic data across Block 7.
Analysis indicates the presence of two significant gas accumulations located below a depth of approximately 11,000 feet, with minimum gross thicknesses of 500 feet and 125 feet respectively. There is also a further but smaller gas accumulation towards the base of the well. These gas accumulations have been trapped in Cretaceous age sands, the first time significant volumes of hydrocarbons have been discovered in a pre-Tertiary formation offshore Mauritania. Reservoir quality within the developed sands is good with porosities up to 37%.
The recovered reservoir fluid has now been interpreted as being an oil-associated gas with no significant impurities and a hydrocarbon liquid to gas ratio of 23 barrels per million cubic feet. In addition, fluid composition, pressure and structural data point to the possibility of a significant oil leg below the lower of the two major gas accumulations. In particular, fluid inclusion work on the rock samples indicates a light oil with a gravity of around 40 degrees API.
Preliminary calculation of hydrocarbon volumes in the Pelican structure suggests approximately one trillion cubic feet of gas in place, with technically recoverable reserves estimated to be in the range of 600 to 800 billion cubic feet (bcf) and 10-13 million barrels of associated liquids. As the base of the hydrocarbon-bearing interval was not encountered in Pelican-1, there is scope for considerable further upside in these estimates.
Andy Bostock, Dana's Technical Director, commented:
'We are greatly encouraged by Pelican, which was our first well in a very large area operated by Dana. A significant volume of gas has been discovered to date offshore Mauritania and this is likely to become commercial as experienced LNG players become involved. Further drilling will be needed to prove the presence of commercial quantities of oil in Block 7 and we are expecting to come back to the Pelican area once our post-well technical work is complete. In the meantime, we are planning to drill Dana's next Mauritanian well in Block 1, in the latter part of 2004, where our exploration team is focusing on two prospects with combined reserves potential approaching 500 million barrels of oil.'
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