The Operator of the BassGas Joint Venture in permit T/L1, Origin Energy, has provided a preliminary reassessment of reserves for the Yolla field based on new data obtained from the recently drilled Yolla-5 and Yolla-6 development wells, in Bass Basin, Tasmania.
According to AWE Limited, a partner in the project with 35% stake, interpretation of log and pressure data obtained from Yolla-5 and Yolla-6 has resulted in a reduction in the estimated original gas in place for the field, although further technical work is required to validate this estimate.
Whilst recognising the need for further analysis, AWE said it has chosen to adopt the preliminary reassessment of the Operator and reduce its share of reported remaining 2P Reserves for the Yolla field by 5.5 mmboe, down to 13 mmboe (as at 30 June 2015).
After the 19.3 mmboe increase in 2P Reserves in the company’s Sugarloaf project, the Yolla reduction represents 5% of the company’s total remaining 2P Reserves of approximately 100 mmboe, AWE said.
The company added that it expects to recognise a non-cash impairment of the carrying value for the BassGas asset of between $100 million to $110 million after tax in its full year accounts.
AWE’s Managing Director, Bruce Clement, said: “The updated reserves at Yolla will result in less gas production later in the field life, but overall it is not expected to have a material impact on production or cash flow during the next three to four years. We anticipate production from the field will increase to a rate close to the facilities’ capacity of 67 TJ/day, once the Yolla-5 and Yolla-6 development wells are brought on-stream.”
“AWE will now consider accelerating development feasibility studies for the Trefoil field in adjacent permit T/18P to determine if its 2C Contingent Resources of 17 mmboe (AWE share) can be developed earlier as an incremental project to Yolla production,” he said.
Clement also added: “AWE will continue to focus on progressing its major development projects, particularly the appraisal drilling and early development of the Waitsia gas project in Western Australia”.
AWE further said it will undertake further detailed assessment of the Yolla field reserves prior to the release of its Reserves and Resources report to be published in the company’s 2015 Annual Report.
The BassGas project consists of the Yolla offshore well head platform connected by pipeline to the gas processing facility at Lang Lang, Victoria. The Yolla platform is located in Bass Strait, approximately 140km offshore from Kilcunda, Victoria.
Other two BassGas JV partners in T/L1 are Toyota Tsusho with 11.25% and Prize Petroleum with 11.25% interest.