Case Study: Permian Basin super-emitters

The Permian Basin spans West Texas and southeastern New Mexico and is the largest oil-producing region in the United States. Between May 2018 and March 2019, Sentinel-5P TROPOMI observations resolved a persistent methane column anomaly across the basin — corresponding to a leak rate of ~2.7 Tg CH₄ per year, or roughly 3.7% of gross gas production. This is the reference point for basin-scale super-emitter monitoring.

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The event

Region: Permian Basin (Delaware sub-basin dominant)
Bounding box: approx. 31.0–33.5° N, 101.5–104.5° W
Observation window: May 2018 – March 2019 (Sentinel-5P TROPOMI)
Estimated leak rate: 2.7 ± 0.5 Tg CH₄ / yr (Zhang et al. 2020)
Leak-loss rate: ~3.7% of gross production — roughly 2× the national US average at the time
Public references: Zhang et al., Science Advances 2020 · IEA Methane Tracker

Why this case matters

Buzachi Neft is a single wellhead. Permian is the opposite regime — a diffuse portfolio of thousands of wellpads, gathering pipelines, compressor stations and flares, all leaking a little, some leaking a lot. It is the canonical portfolio-scale monitoring problem and the reason a single-source or single-facility platform cannot serve a mid-stream or upstream operator here.

In our production pipeline, Permian coverage requires: TROPOMI ingest at 24 h cadence for basin-wide screening; targeted GHGSat / EMIT retrieval on the top decile of persistent emitters; per-wellpad attribution using our 25 km / ±6 h scorer; and reconciliation against each operator's declared inventory. The Zhang et al. basin total is the top-line number every portfolio estimate must foot to.

What we validate against

Sum of attributed detections across all Permian facilities in the observation window matches the Zhang et al. basin total within stated uncertainty.
Top-decile persistent emitters overlap with those independently identified by Cusworth et al. (2021, PNAS) using EnMAP / AVIRIS-NG.
Operator-level reconciliation matches Environmental Defense Fund's PermianMAP where operators overlap.

Illustrative

Sentinel-5P TROPOMI mean XCH₄ column anomaly over the Permian Basin, May 2018 – March 2019, showing an elevated methane hotspot over the Delaware sub-basin. — Illustrative reconstruction of the Sentinel-5P TROPOMI mean XCH₄ anomaly over the Permian Basin (May 2018 – March 2019) from public Sentinel-5P L2 data via the Copernicus Data Space Ecosystem — the same feed we ingest. Not a reproduction of Zhang et al. (2020) Fig. 1.

The Zhang et al. TROPOMI XCH₄ map (their Fig. 1) is the reference plate and sits behind the Science Advances paywall.