Santos announced the discovery of gas-condensate at the Lasseter-1 exploration well in WA-274-P, located in the Browse basin, offshore Western Australia.
The Lasseter-1 well is located approximately 35km east-southeast of Santos’ Crown discovery and 480km north-northeast of Broome with a water depth of 404m. The well reached a total depth of 5329m measured depth relative to rotary table (MDRT).
The well intersected a gross gas condensate-bearing interval of 405m. Wireline logging to date has confirmed 78m of net pay over the Jurassic-aged Lower Vulcan and Plover intervals, between 4880 and 5285m MDRT.
Santos says they will plug and abandon the well as planned.
Pressure and data samples confirm excellent mobility in the higher porosity sands in the Lower Vulcan. Multiple independent hydrocarbon columns are interpreted, including an estimated 250m column for the Lower Vulcan reservoirs.
Multiple hydrocarbon samples have been recovered and the initial analysis confirms a condensate to gas ratio in the range of 10-25bbls/MMscf and inerts consistent with proximal field gas compositions and pre-drill expectations.
“The Lasseter discovery is well positioned, in close proximity to existing and proposed LNG projects in the Browse Basin and other material Santos joint venture exploration prospects,” says Bill Ovenden, Santos head of exploration. “The Lower Vulcan reservoir system, which is optimally developed between the Ichthys and Poseidon structural trends, holds great promise.”
Santos is the operator and holds a 30% interest in WA-274-P with joint venture partners Chevron (50%) and INPEX (20%).
ConocoPhillips and Karoon Gas encountered hydrocarbon pay in the Browse basin in July 2014 in the Pharos-1 well. The well showed a 53m gross interval, with a 34m net pay interpreted in the gas charged Montara formation sandstone reservoir.
Also, the Ichthys LNG project is scheduled to begin production by the end of 2016, with gas sourced from the Ichthys gas and condensate field in the Browse basin.
Image of the Browse basin from Santos.
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