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Concurrent 19. Oral Presentation for: Do we know enough to make future-proofed decisions about contaminants when decommissioning offshore oil and gas infrastructure?

Darren J. Koppel A *
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A Australian Institute of Marine Science, Tropical Ecotoxicology and Risk Asessment, Perth, WA, Australia.

* Correspondence to: d.koppel@aims.gov.au

The APPEA Journal 63 - https://doi.org/10.1071/AJ22367
Published: 2 June 2023

Abstract

Presented on Wednesday 17 May: Session 19

Offshore oil and gas infrastructure must be decommissioned at the end of its operational life. The base case approach for decommissioning under Australia’s regulatory framework is the complete removal of all infrastructure. However, alternative decommissioning approaches, such as leaving some infrastructure in situ, may deliver better environmental, economic, and health and safety outcomes. Derogation from complete removal requirements is possible if alternative approaches have acceptable environment impacts and deliver equal or better environmental outcomes. Potential environmental contaminants are present in all offshore infrastructure and if decommissioned in situ could pose unacceptable risks to marine ecosystems. Contaminants may accumulate in infrastructure as a result of oil and gas production, such as scales of mercury and naturally occurring radioactive materials, or arise from the degradation of infrastructure itself, such as plastics and steel corrosion products. The unique behaviour and interactions of contaminants with local ecosystems makes assessing their potential impacts challenging. This presentation reports on the contaminants likely to be present in offshore oil and gas infrastructure proposed to be decommissioned in situ. The expected behaviour of these contaminants in the marine environment is discussed to give context to measures of their potential hazards (i.e. guideline values). This paper is intended to start a conversation and serve as a useful guide for titleholders and regulators about some data needs to assess potential contaminant impacts from in-situ decommissioning.

To access the Oral Presentation click the link on the right. To read the full paper click here

Keywords: ecological risk assessment, environmental impact assessment, mercury, NORM, pollution, rigs to reef, sea dumping, waste.

Dr Darren Koppel leads ‘contaminants in decommissioning research’ as a Research Scientist at the Australian Institute of Marine Science in Perth. His PhD in Ecotoxicology and Chemistry investigated the environmental risk of metals from Antarctic legacy waste sites. Darren is a board member of SETAC’s Asia-Pacific Geographic Union and a member of SETAC’s advisory panel to the UNEP Open Ended Working Group on a Science-Policy Panel for the sound management of chemicals and waste, and to prevent pollution.