Natural Gas and Petroleum Systems in the GHG Inventory: Additional Information on the 1990-2020 GHG Inventory (published April 2022)

As part of the annual process to develop the U.S. Inventory of Greenhouse Gas Emissions and Sinks (GHG Inventory), EPA assessed new data for updates to its estimates for natural gas systems, petroleum systems, and abandoned oil and gas wells.

Please see the memos below for information on these updates. The natural gas systems, petroleum systems, and abandoned oil and gas wells methodology annexes for the 1990-2020 GHG Inventory are available below as well.

For previously posted information from the stakeholder process, view the archives of memos and presentation slides regarding updates considered for the 1990-2020 GHG Inventory.

View information about revisions to estimates for natural gas and petroleum systems in the GHG Inventory for earlier Inventory release years.

Methodology Annexes

• Annex 3.5: Methodology for Estimating CH4, CO2, and N2O Emissions from Petroleum Systems (xlsx) (258.85 KB)
• Annex 3.6: Methodology for Estimating CH4, CO2, and N2O Emissions from Natural Gas Systems (xlsx) (453.11 KB)
• Methodology for Estimating CH4 and CO2 Emissions from Abandoned Oil and Gas Wells (xlsx) (56.85 KB)

Memos on updates to estimates for natural gas and petroleum systems

• Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990-2020: Updates for Gas STAR and Methane Challenge Reductions (pdf) (461.63 KB)
• Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990-2020: Updates for Post-Meter Emissions (pdf) (376.02 KB)
• Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990-2020: Updates for Abandoned Oil and Gas Wells Emissions (pdf) (265.29 KB)
• Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990-2020: Update for Anomalous Leak Events (pdf) (203.58 KB)