GEO ExPro

Australia: Santos Building Reserves

This article appeared in Vol. 11, No. 5 - 2016

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Although not tested, Santos has claimed its Lasseter 1 wildcat in WA-274-P in the Browse Basin off Western Australia as a significant gas/condensate discovery. The well, located in 404m of water, was targeting gas within multiple units as a follow-up to the 2012 Crown discovery, which lies around 35 km to the north-west. Lassiter 1 is around 480 km north-north-east of Broome, which puts it in the vicinity of two FLNG projects. Drilled to a total depth of 5,329m, the well intersected a gross hydrocarbon column of 405m and net pay of 78m over the Jurassic Lower Vulcan and Plover intervals, between 4,880 and 5,285m. This interpretation has been confirmed by pressure and sample data that confirm excellent mobility in the higher porosity sands in the Lower Vulcan. Initial analysis confirms a condensate to gas ratio in the range of 10-25 bo/Mcf. The structure lies primarily in WA-274-P, with possible down-dip extension into WA-281-P to the south-west and is also in close proximity to the June 2013 Bassett West discovery, in which Santos is partner.

The two FLNG projects in the Browse Basin are Shell’s Prelude project that is under construction and will be located 475km north-east of Broome and Woodside’s Browse project. A final investment decision on Browse, described by Woodside as the foundation of its next phase of growth, is expected in 2015 after the company dropped plans to build an onshore LNG plant. 

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