San Andres Formation

Operator-reported tops from 88,616 wells across 37 counties, median tops running 815–4,626 ft by county.

Depth by County

County	Wells	Median Top	Typical Range	CSV
Andrews	10,418	4,481 ft	4,241–4,845	↓
Midland	8,268	4,549 ft	4,112–5,213	↓
Martin	6,979	4,210 ft	3,636–4,775	↓
Ector	6,480	4,122 ft	3,480–4,781	↓
Howard	6,329	3,071 ft	2,019–3,568	↓
Yoakum	6,228	4,564 ft	4,378–5,153	↓
Yoakum	5,359	4,549 ft	4,325–5,038	↓
Hockley	4,725	4,626 ft	3,818–4,975	↓
Upton	4,486	4,496 ft	3,786–4,950	↓
Reagan	3,290	3,213 ft	2,292–3,814	↓
Howard	3,162	3,497 ft	2,190–3,990	↓
Crane	2,695	2,965 ft	2,595–3,495	↓
Scurry	2,329	1,670 ft	1,450–1,965	↓
Pecos	2,224	1,520 ft	1,200–2,285	↓
Yoakum	1,867	4,574 ft	4,002–4,995	↓
Garza	1,830	2,408 ft	1,748–3,200	↓
Mitchell	1,585	1,620 ft	1,420–1,778	↓
Dawson	1,539	4,421 ft	3,620–4,876	↓
Crockett	1,451	1,858 ft	1,265–2,495	↓
Irion	1,424	1,804 ft	1,076–2,143	↓
Terry	1,044	4,544 ft	4,300–5,230	↓
Winkler	962	3,851 ft	3,532–4,211	↓
Borden	881	3,162 ft	2,311–3,586	↓
Ward	776	3,534 ft	2,915–3,870	↓
Crosby	662	2,747 ft	2,450–2,960	↓
Sterling	531	1,976 ft	1,590–2,330	↓
Tom Green	248	830 ft	522–1,055	↓
Kent	194	1,321 ft	1,100–1,870	↓
Lubbock	171	3,386 ft	2,996–4,300	↓
Lynn	136	3,818 ft	3,163–4,422	↓
Lamb	98	3,228 ft	3,007–4,079	↓
Fisher	87	815 ft	338–1,145	↓
Hale	77	3,132 ft	2,962–3,900	↓
Throckmorton	50	900 ft	404–1,250	↓
Terrell	14	1,755 ft	1,307–2,316	↓
Schleicher	12	1,094 ft	767–1,578	↓
Motley	5	889 ft	799–1,749	↓

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.

Most Active Operators

PIONEER NATURAL RES. USA, INC. 4,852 wells · 1157 recent

DIAMONDBACK E&P LLC 2,204 wells · 673 recent

ENDEAVOR ENERGY RESOURCES L.P. 2,021 wells · 361 recent

BLACKBEARD OPERATING, LLC 1,010 wells · 269 recent

PERMIAN RESOURCES OPERATING, LLC 935 wells · 212 recent

MARATHON OIL COMPANY 1,436 wells · 209 recent

DE IV OPERATING, LLC 324 wells · 209 recent

OVINTIV USA INC. 517 wells · 203 recent

XTO ENERGY INC. 2,737 wells · 202 recent

COG OPERATING LLC 1,212 wells · 189 recent

OXYROCK OPERATING, LLC 1,688 wells · 171 recent

APACHE CORPORATION 1,905 wells · 159 recent

Ranked by wells permitted in the last 3 years with this formation on file.