Role of Intermittency on the Effectiveness of Methane Emissions Detection at Oil and Gas Facilities: Comparative Assessment of Optical Gas Imaging and Site-wide Surveys

15 February 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Intermittent emission events are a significant source of methane emissions from oil and gas operations. New technologies such as site-wide aerial surveys promise more effective detection of intermittent emission events compared to conventional optical gas imaging (OGI) surveys. In this work, we present case studies to assess role of intermittent emission events on the emissions reduction equivalence between conventional OGI-based surveys and site-wide screening surveys with new technologies. We find that the equivalence condition between OGI-based surveys and site-wide screening is robust against different assumptions about the duration of large emitters. As duration of large emitters decrease, monthly site-wide screening surveys are more effective at detecting large emitters compared to quarterly OGI monitoring. However, the contribution of large emitters to total emissions also decreases, which reduces the impact of the higher detection effectiveness of site-wide surveys. In addition, annual OGI survey as part of site-wide screening strategy is more critical when the detection threshold of the screening technology is greater than 10 kg/h or higher as the screening survey does not detect below detection threshold emissions.


EPA methane rule
Oil and Gas

Supplementary materials

Supplementary Information
Additional case studies, analyzes, and figures that supplement material presented in the main text.


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