Western Gas targets giant resource with Sasanof well offshore Australia

Offshore staff

SUBIACO, Australia – Western Gas expects to drill the Sasanof prospect offshore Western Australia early next year.

The deepwater semisubmersible Valaris MS-1 will drill the vertical Sasanof-1 well in 1,070 m (3,510 ft) of water in the WA-519-P permit, to a planned TD of 2,500 m (8,202 ft).

The Sasanof prospect is on trend with and updip of the Mentorc gas and condensate field and the nearby Scarborough and Io-Jansz gas fields in the Carnarvon basin. The prospect, covering 505 sq km (195 sq mi), contains potentially 24 tcf of gas and 1.1 Bbbl of condensate, with an estimated a geological chance of success of 35%.

This will be Western Gas’ first well from its exploration portfolio surrounding the offshore Equus gas project, a 2-tcf, 42-MMbbl discovered resource, which has delivered 15 discoveries from 17 wells.

Sasanof is interpreted as a large, seismic amplitude-supported, structural-stratigraphic trap in good-quality reservoir sands at the top of the Cretaceous Lower Barrow Group formation.

There has been no prior drilling on WA-519-P, which was awarded in September 2015. Western Gas licensed and reprocessed multiple 3D seismic surveys over the area to define the exploration potential, and commissioned rock physics and quantitative interpretation studies by DownUnder Geosolutions.

07/12/2021