The well encountered an hydrocarbon column of about 85 m in the Lunde formation, 40 m of which were of moderate to good reservoir quality, according to a news release.
Kosmos’ gas discovery comes as many of its peers cut back on exploration, especially in frontier areas, as the downturn marked by lower commodity prices and profits lingers.
Based on preliminary analysis of drilling and wireline logging results, Marsouin-1 encountered at least 70 m (230 ft) of net gas pay in Upper and Lower Cenomanian intervals comprised of excellent quality reservoir sands.
The well, drilled in a water depth of 38 m (125 ft), encountered a major gas and condensates buildup in the presalt clastic geological sequence of lower Cretaceous age, crossing a hydrocarbon column of 240 m (787 ft), the release said.
Together, the Houston company estimates likely net recoverable reserves could increase to more than 70 MMboe from 50 MMboe.
Egypt entered the LNG market with a burst of imports earlier this year, making it one of the world's top growth markets.
The Alma/Galia field was first developed by a different operator under the name Argyll in the early 1990s
The company does not yet have sufficient evidence to determine whether this or any part of the resource can be technically or economically produced.
Range announced that hydrocarbon sands and oil shows were encountered at the Upper Cruse channel sand complex during drilling of the well, with electric log interpretation confirming the presence of recoverable hydrocarbons with an estimated net pay of 48 ft.
Preliminary estimates suggest the find contains between 9 and 19 million barrels of recoverable oil equivalents.
The resource estimate for the find was originally seen to contain between 125 and 400 million barrels of oil equivalent.
The well, combined with two follow-on development wells at Horn Mountain Deep, may be capable of producing an aggregate of 30,000 barrels of oil equivalents per day (boe/d).