In 2011, AGL began injecting and storing gas underground at the depleted Silver Springs/ Renlim reservoir in the Bowen Surat Basin in central Queensland. AGL provides the storage to QGC Pty Limited, supporting their development of a liquefied natural gas facility in Gladstone.
The gas field produced gas from 1978 to 1999 for the Brisbane market. Gas production finished in 2000 and the reservoir is now fully depleted. The shale-capped reservoir prevents gas from escaping from what has been proved to be an ideal underground gas storage location.
The Silver Springs/Renlim underground gas reservoir is approximately 500m below the deepest known aquifer bearing sandstones in the Great Artesian Basin. The reservoir is overlain by a thick layer of impermeable cap rock, which has acted as a gas-tight seal for millions of years.
All gas wells drilled into these fields have been isolated from aquifers with cement and steel casing, This prevents any connectivity between the gas reservoir and the Great Artesian Basin.
AGL's new wells for the gas storage facility will use high grade cement and casing from the surface to a depth of 2000m. This will ensure sealing and isolating the aquifers above the gas storage reservoir from the wellbore. The gas injected into the reservoir will also be contained by an impermeable layer of cap rock located directly above the sandstone, thus preventing the injected gas from migrating into the Great Artesian Basin.
The water quality, reservoir pressures and gas-water contact movements in sandstone reservoir will be monitored as part of a comprehensive reservoir management plan.
Read the Environmental Assessment assessment below:
AGL Gas Storage Pty Ltd (AGL) acquired the existing Wallumbilla Liquefied Petroleum Gas (LPG) Facility (the Facility) from Santos QNT Pty Ltd (Santos) in April 2011.
The Project is located approximately 13 km south of Wallumbilla and 42 km east-southeast of Roma, in the Darling Downs region of Queensland.
As the Environmental Authority (EA) for the Facility formed part of Santos' broader project EA, the EA could not be transferred as part of the sale process and as a consequence the Facilty could not continue in operation.
The Facility was in operation from 1984 until the purchase by AGL in 2011, however it is currently "mothballed".
AGL proposes to recommission the Facility as an integral component to support the withdrawal phase of the Silver Springs Underground Gas Storage Project to process the gas removing the propane, butane and condensate in order to provide sales quality gas to QGC to support its Queensland Curtis LNG Project.
A new EA in accordance with Chapter 5A of the Environmental Protection Act is required to operate the Facility.
The following documents relate to the application for an Environmental Authority:
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