The operator completed a detailed assessment of the plays, prospects and leads in the permit in 2010 including the 3D seismic acquired in 2008. Over 10 gas leads and prospects were defined in the Triassic Mungaroo Formation.
The Tallaganda-1 prospect straddles both the WA-351-P and WA-335-P permits and was designed to test the gas potential of sandstones in the prolific Triassic age, Mungaroo Formation. This is the primary play type of the gas prolific North West Shelf.
On 1 March 2012 the Tallaganda-1 well commenced drilling in WA-351-P. The well was drilled to a final total depth of 4,365 metres MDRT and the rig released on 26 April 2012. Three cores were cut over the target from 3,879 to 4,009 metres with 100% recovery achieved for all cores. A comprehensive suite of wire line logs including formation image logs, a wire line pressure survey and formation fluid sampling program were acquired in the well.
Tap has since booked 49 PJ as a 2C contingent resource for the WA-351-P portion of the Tallaganda structure (ASX release 29 January 2013).
The discovery of hydrocarbons at Tallaganda-1 is considered significant for the future exploration potential of the permit as it confirms an active petroleum system within the acreage and proves the Mungaroo play on block, for which a number of undrilled prospects are identified. Current efforts are directed at geological and geophysical studies, integrating reprocessed 3D seismic data and the results of the recent Bunyip-1 well on the greater Tallaganda structure within adjacent block WA-335-P to the south, aimed at high grading Triassic Mungaroo prospects for future drilling.