US tops upstream oil & gas CO2 emitters list

Rystad Energy’s first report ranking the world’s oil and gas producers by how much CO₂ is emitted in connection with their upstream activities shows that the US was the largest emitter in absolute terms in 2018. Among the top 10 oil and gas producing countries, Canada had the highest CO₂ emission intensity per boe produced, while Norway had the lowest.

For 2018, the year with the latest reliable data, the US was the world’s top emitter from upstream oil and gas producing activities in absolute terms, releasing a total of 133mn tonnes of CO₂, according to Rystad’s analysis, followed by Russia (116mn tonnes) and Canada (114mn tonnes). The emission numbers referenced here do not include what are categorised as midstream elements (eg gas processing plants).

When it comes to CO₂ intensity per produced boe, Norway shows the lowest upstream CO₂ footprint among the top 10 producing countries, with approximately 7 kgCO₂/boe produced. Norway introduced a CO₂ pricing mechanism in the early 1990s, while also adhering to the EU carbon trading system, which has motivated operators in the country to put extra emphasis on emission-reducing measures and technologies, comments the market analyst.

Several major Norwegian offshore fields, such as the giant Johan Sverdrup project, are now partly or fully electrified by power from shore, thus reducing CO₂ extraction emissions substantially – even approaching zero in some instances. Furthermore, gas flaring has been banned in the country since the 1970s, with certain exceptions for safety purposes, which has resulted in a very low flaring intensity.

The United Arab Emirates (UAE), Qatar and Saudi Arabia are challenging Norway for the top position in terms of CO₂ intensity, reports Rystad, each with emissions at or below 10 kgCO₂/boe. Saudi Arabia and the UAE benefit from hosting large field developments with stable production levels and limited flaring, all of which contribute to low emission intensities. Moreover, production in these countries is dominated by light and medium grade crudes, which are less energy-intensive to extract compared to heavier oils.

At the other end of the scale, Canada and Iraq are both among the world’s highest upstream emitters, albeit for entirely different reasons. Canada, with an average intensity of 39 kgCO₂/boe, has a high share of its production from oil sands, typically emitting three to five times more CO₂ per barrel than the global average of 18 kgCO₂/boe. Heavy oil produced by mining or in-situ is more complicated to extract and the process is very energy-intensive. In recent years several major producers have divested their assets in these segments due to the expensive extraction process and the high carbon footprint.

Iraq, on the other hand, with an intensity of 31 kgCO₂/boe, has relatively low extraction emissions. However, the lack of gas infrastructure in the country means that significant volumes of associated gas are flared directly. The country must, in fact, import gas in order to meet its energy requirements. An expansion of Iraq’s domestic gas infrastructure would allow it to reduce flaring and imports, but such plans have yet to materialise, notes Rystad Energy.

‘The average upstream CO₂ emission intensity of oil and gas production worldwide was about 18 kgCO₂/boe in 2018, but the variation between producers is high – both in terms of countries and companies. Between individual fields, the variation is even higher,’ says Rystad Energy’s Jon Erik Remme, Senior Upstream Analyst and Product Manager of Emissions Solution.

The amount of flaring served as a key distinguisher leading to a difference of 23 kgCO₂/boe observed between the highest and the lowest intensities in Rystad’s analysis. In addition to flaring, the inherent differences in extraction emissions driven by the method of extraction, the field type, age of the field and other factors collectively yielded a difference of around 30 kgCO₂/boe between the highest and the lowest intensities.