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New Zealand's petroleum reserves data shows decline in gas reserves

Christian Fernsby |
The Ministry of Business, Innovation and Employment (MBIE) released annual data detailing the amount of oil and gas expected to be available in existing petroleum fields.

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This year’s data, supplied to MBIE by both onshore and offshore permit holders, shows a 17% decrease in Proven plus Probable (2P) reserves. 1635 Petajoules (PJ) of 2P Gas reserves have been reported as at 1 January 2023, down from 1967 PJ a year earlier.

The most significant decreases in 2P reserves came from the Mangahewa and Maui fields which saw a decrease in 48% and 34% respectively.

Estimated gas reserves have now dropped below ten years of remaining use for the first time, based on an average gas use of 200PJs over the last 10 years. However current gas use and supply are below this level.

In 2022, Aotearoa New Zealand used 145PJs of gas, compared to 155PJs for 2021 and 183PJs for 2020. This decline was driven by a reduction in industrial use due to the mothballing of Methanex’s Waitara Valley facility, closure of the Marsden Point oil refinery, and a decline in gas use for electricity generation. 2022 was the wettest and warmest winter on record, which led to more electricity being supplied from renewable hydro generation.

In previous years gas use has been balanced by increases in 2P reserves. However, in 2022 there was an overall net decrease of 332PJ in gas reserves from a combination of both gas use and revisions of remaining 2P gas reserves.

The reserves release includes updated estimates of future gas production. This shows production is expected to drop below 2022 gas use of 145PJs in 2027 without continued conversion of 2C contingent reserves into 2P reserves.

There was also a 41% decrease in 2C Contingent reserves in 2022. 2C Contingent reserves represent potential resources that may be able to be converted into 2P reserves in the future. This decrease was primarily due to technical revisions by operators due to performance data.


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