Grayburg Formation

Operator-reported tops from 48,389 wells across 28 counties, median tops running 441–4,449 ft by county.

Top depth: 1,867 ft 4,666 ft

19,169 wells shown (sampled from 48,389)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Andrews	7,837	4,270 ft	4,027–4,675	↓
Midland	7,271	4,239 ft	3,861–4,599	↓
Martin	6,148	3,934 ft	3,340–4,480	↓
Ector	5,591	3,973 ft	3,654–4,407	↓
Upton	3,526	3,979 ft	2,618–4,593	↓
Reagan	3,209	2,790 ft	2,082–3,490	↓
Crane	2,451	2,761 ft	2,454–3,260	↓
Glasscock	2,399	3,346 ft	2,350–3,797	↓
Pecos	1,946	1,394 ft	1,162–2,050	↓
Yoakum	1,551	4,266 ft	4,096–4,480	↓
Gaines	1,442	4,210 ft	4,050–4,582	↓
Irion	1,168	1,506 ft	1,074–1,823	↓
Howard	1,022	2,020 ft	1,659–3,006	↓
Crockett	721	1,782 ft	1,216–2,220	↓
Hockley	627	3,818 ft	3,589–3,958	↓
Mitchell	262	1,500 ft	1,254–1,510	↓
Winkler	260	3,384 ft	3,214–3,657	↓
Sterling	180	1,842 ft	1,491–2,080	↓
Cochran	178	3,956 ft	3,756–4,018	↓
Scurry	137	1,422 ft	1,298–1,522	↓
Dawson	121	4,123 ft	3,350–4,316	↓
Ward	84	3,260 ft	2,723–3,445	↓
Terry	83	4,244 ft	3,986–4,429	↓
Borden	50	3,050 ft	2,035–3,140	↓
Garza	48	2,600 ft	2,211–2,670	↓
Crosby	37	2,619 ft	2,545–2,676	↓
Tom Green	35	441 ft	393–578	↓
Hale	5	4,449 ft	3,596–5,877	↓

Counties with fewer than 5 wells omitted. Depths are measured depth as filed; typical range is the 10th–90th percentile of reported tops — raw filings contain occasional typo depths, so extremes are not shown.