Spectrum geologists discuss the case for shallow water oil Offshore Gabon and how one of the biggest discoveries in the world – ENI’s Nyonie-Deep discovery has wrongly caused the area to become less attractive to explorers. First published in Geo ExPro, April 2017.
Since the 5,000 sq.km of open acreage in shallow water off North Gabon sits adjacent to the site of one of the biggest discoveries in the world, ENI’s 2014 Nyonie-Deep discovery, one might expect that such a discovery would have made the surrounding acreage incredibly highly sought-after. Actually this area now suffers from one major drawback – the Nyonie-Deep discovery.
The issue at first glance is that Nyonie-Deep discovered gas in pre-salt syn-rift Dentale formation sandstone (locally called Coniquet Sandstone) that has low permeability. Gas in itself is not the hydrocarbon of choice in Gabon, which is at an early stage in its development of a gas export system, and the meme has grown from this discovery that the pre-salt of North Gabon is tight and gas prone. Nyonie redeems itself commercially by being a very large accumulation, estimated at 500 MMboe – and ironically gas is the only fluid producible from such low permeability sands.
So does this really write-off the whole of the pre-salt of North Gabon as being gas prone and tight? We argue absolutely the reverse…
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The Angle of the North – Shallow water oil is hidden in plain sight in North Gabon