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Bass Basin


The Bass Basin is located offshore between the southern tip of Victoria and the northern margin of Tasmania in the shallow waters of Bass Strait.

In the Bass Basin, Beach extracts natural gas from the Yolla field, transporting it to shore via a 147 kilometre subsea pipeline. There, it joins the 32km-long raw gas pipeline to the BassGas processing plant near Lang Lang in Victoria.

Once processed at BassGas, natural gas is supplied to the east coast domestic gas market.

Yolla Platform, Bass Basin, Victoria

Yolla Platform, Bass Basin, Victoria

BassGas plant, Lang Lang, Victoria

Construction of BassGas began in 2001.

The installation of an offshore platform (Yolla-A), drilling of Yolla-3 and Yolla-4 development wells, and the construction of an export pipeline and onshore processing facility were completed in 2004, with the first natural gas production commencing in 2006.

Two additional production wells, Yolla-5 and Yolla-6, were drilled in 2015 and commenced production in August of that year.

A wireline campaign conducted on Yolla in 2018 resulted in initial incremental gross production of 4 – 5 TJ/d.


  • Beach acquired its interests in the BassGas Project via the Lattice and Toyota Tsusho acquisitions.
  • Gas and liquids within the Yolla field are extracted from a sandstone reservoir over 3km in depth through four wells via the Yolla offshore platform which is located in 80 metres of water.
  • Beach Energy is the operating partner of the BassGas joint venture which also includes AWE Limited and Prize Petroleum International Pte Ltd.
  • The Yolla-A facility has been designed such that it can be fully operated from either the onshore gas plant Central Control Room at Lang Lang or the offshore control panel on the platform.
Image of the bright yellow Yolla Offshore platform sitting alone and surrounded by a vast blue ocean

Yolla platform

BassGas Plant, Victoria

BassGas Plant, Victoria

Environment Plan Revision

Beach Energy is revising the Environment Plan for its BassGas offshore operations in Victoria.

Download the information sheet, link below, which provides an overview of the offshore operations, the regulatory framework for safety and environment requirements, potential impacts and risks in continuing these operations, and measures to reduce and manage these in accordance with State and Commonwealth regulations.

Bass Gas Information Sheet


The Bass Basin is a Cretaceous to Cainozoic-aged intracratonic rift basin that formed as part of the Southern Rift System along Australia’s southern margin during regional breakup between Australia and Antarctica.

The Bass Basin covers an area of 42,000 km2 and is separated from the Otway Basin to the west by the King Island High, and from the Gippsland Basin to the northeast by the Flinders Island and the Bassian Rise.

The basin features a thick sedimentary succession of interbedded sandstones, shales and coals that were deposited in a range of fluvial, fluvio-deltaic and lacustrine environments. For most of its history the basin featured terrestrial environments without major marine influence.

Coals and coaly shales form the main petroleum source intervals in the basin. All known hydrocarbons have been discovered within Paleocene to Eocene-aged sandstone reservoirs of the Eastern View Group. Well data shows that the producing intervals tend to comprise multiple, stacked reservoir-seal pairs.


To learn more about Beach’s operations in the Victorian Otway Basin, contact our Community Relations Manager (Victoria):

Linda French
Community Relations Manager – Victoria

For more information on the petroleum industry regulatory processes in Victoria please visit: