Now it seems a more realistic view is 80 million barrels, 45% lower. Upstream understands that Siri-3, the second of two back-to-back appraisal wells this summer, failed to prove an easterly extension of the Palaeocene sandstone reservoir. It did find a small separate accumulation. Kjell Ravndal, Statoil's production manager in Denmark, refused to comment on current reserves estimates but conceded drilling results were more complex than expected .