Preprints
https://doi.org/10.5194/egusphere-2025-4666
https://doi.org/10.5194/egusphere-2025-4666
06 Oct 2025
 | 06 Oct 2025
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Surveying Methane Point-Source Super-Emissions across Oil and Gas Basins with MethaneSAT

Luis Guanter, Javier Roger, Jack Warren, Maryann Sargent, Zhan Zhang, Sébastien Roche, Christopher Chan Miller, Michael Steiner, Harvey Hadfield, Mark Omara, James P. Williams, Katlyn MacKay, Jonathan E. Franklin, Steven C. Wofsy, Steven P. Hamburg, and Ritesh Gautam

Abstract. Methane emissions from the oil and gas (O&G) industry play a major role in the global methane budget. The MethaneSAT mission, which operated between March 2024 and June 2025, was designed to provide high-quality data on O&G methane emissions, including both regional fluxes and high-emitting point sources. This is enabled by MethaneSAT's high spectral resolution (0.25 nm), medium spatial sampling (110x400 m2 at nadir), and wide-area coverage (about 200 km at nadir). In this work, we showcase the potential of MethaneSAT to survey high-emitting point sources across O&G basins. We first assess MethaneSAT's performance for the detection, quantification and attribution of methane plumes through the analysis of key observation-related parameters, including wind speed, surface albedo and spatial sampling. We estimate a detection limit of about 500 kg/h for favourable observation conditions, which are mostly facilitated by low winds. We then analyse selected MethaneSAT datasets from the main O&G methane hotspots in the world. We observe particularly strong and persistent sources in the Turkmenistan's South Caspian basin and the U.S. Permian Basin (especially across the Midland sub-basin), and reveal major super-emissions in the Maturin (Venezuela), Zagros Foldbelt and Widyan (Iran) O&G basins, and the Appalachian basin including O&G and coal production. We also highlight other examples of strong methane sources at high latitudes (West Siberia), in offshore platforms in the Gulf of Mexico, and from the waste sector.

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Luis Guanter, Javier Roger, Jack Warren, Maryann Sargent, Zhan Zhang, Sébastien Roche, Christopher Chan Miller, Michael Steiner, Harvey Hadfield, Mark Omara, James P. Williams, Katlyn MacKay, Jonathan E. Franklin, Steven C. Wofsy, Steven P. Hamburg, and Ritesh Gautam

Status: open (until 17 Nov 2025)

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Luis Guanter, Javier Roger, Jack Warren, Maryann Sargent, Zhan Zhang, Sébastien Roche, Christopher Chan Miller, Michael Steiner, Harvey Hadfield, Mark Omara, James P. Williams, Katlyn MacKay, Jonathan E. Franklin, Steven C. Wofsy, Steven P. Hamburg, and Ritesh Gautam
Luis Guanter, Javier Roger, Jack Warren, Maryann Sargent, Zhan Zhang, Sébastien Roche, Christopher Chan Miller, Michael Steiner, Harvey Hadfield, Mark Omara, James P. Williams, Katlyn MacKay, Jonathan E. Franklin, Steven C. Wofsy, Steven P. Hamburg, and Ritesh Gautam
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Latest update: 06 Oct 2025
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Short summary
MethaneSAT was a satellite mission which generated data on methane emissions. In this work, we evaluate the potential of MethaneSAT to detect and quantify methane plumes, and use the existing data archive to evaluate the methane super-emissions from the most important oil and gas basins in the world.
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