STRIKE Energy Limited has confirmed what it has described as a significant gas discovery in the Wagina sandstone as part of the West Erregulla-2 drilling campaign in the onshore Perth Basin in Western Australia.
The Strike-Warrego Joint Venture reported that the Wagina sandstone was found to be approximately 74 metres plus in thickness and made up of sections of clean sand with interpreted blocky porosity development that was observed on drilling to have hydrocarbons present throughout. This section was observed and interpreted from 4106m to 4180m.
Strike’s managing director, Stuart Nicholls said this is a significant discovery and comes from a secondary target which carried a low pre-drill probability of success.
“Importantly, it provides further confidence in Strike’s predictions of good porosity development within Permian reservoirs being possible at depths greater than that of Waitsia and to the south-east.
“With good porosity trends continuing with depth, Strike believes that it is on track to find a good quality reservoir within its primary target in the Kingia-High Cliff.
With the primary target remaining to be drilled and potentially even more Wagina to come, this is a very exciting time for the company.”
Notably the well section was finished without observing the end of the Wagina and Strike believes there is potential for further Wagina sands to be encountered in the next section. The wireline logs have been loaded into Strike’s geological model and formation tops have been correlated to nearby offset wells.
This correlation suggests that the Basal Wagina sandstone which is the formal secondary target of the well, is yet to be encountered.
Mr Nicholls said the sudden influx of over-pressured gas into the well whilst drilling through the Wagina exceeded expectations and required mud weight changes to re-establish appropriate well conditions.