FORMATIONS · RRC WELLBORE FILE
Dean
Reported as a top in 30,257 wells across 38 counties, at a median depth of 8,226 ft (6,118 to 9,270 ft in most wells). 1,155 of those wells were permitted in the last three years.
A well counts if any of its completion filings report this formation, whether it produces from it or drilled through it. Depths are measured depth as filed; typo depths exist, which is why ranges are percentiles, not extremes. About completion reports →
- 30.3K
- wells reporting a top
- 1,155
- permitted in last 3 years
- 38
- counties
- 8,226
- median top, ft
COMPUTED OCT 29, 2026 · REBUILT DAILY
Depth by county
Counties with at least five wells reporting the top. Bars are well counts.
| County | Wells | Median, ft | P10–P90 | Last 3 yrs |
|---|---|---|---|---|
| Martin | 7,204 | 8,830 | 8,125–9,458 | 569 |
| Reagan | 4,627 | 7,436 | 6,653–8,097 | 93 |
| Midland | 4,114 | 8,900 | 8,424–9,324 | 5 |
| Upton | 3,270 | 8,630 | 8,044–9,016 | 47 |
| Howard | 3,169 | 7,420 | 6,328–7,900 | 219 |
| Glasscock | 1,767 | 7,960 | 6,919–8,254 | 5 |
| Irion | 1,486 | 6,044 | 4,902–6,376 | 7 |
| Crockett | 1,238 | 5,066 | 4,419–6,089 | 0 |
| Andrews | 642 | 9,613 | 9,382–9,735 | 7 |
| Dawson | 603 | 8,500 | 8,144–9,304 | 109 |
| Ector | 518 | 9,056 | 8,909–9,346 | 3 |
| Borden | 454 | 6,462 | 5,794–7,762 | 70 |
| Sterling | 434 | 6,042 | 5,629–6,349 | 0 |
| Tom Green | 265 | 5,955 | 5,548–6,326 | 0 |
| Schleicher | 102 | 4,482 | 3,590–5,146 | 0 |
| Gaines | 99 | 9,550 | 8,722–9,772 | 2 |
| Terry | 73 | 8,967 | 8,519–9,664 | 0 |
| Garza | 46 | 6,258 | 5,730–6,726 | 1 |
| Reeves | 28 | 9,684 | 9,194–9,832 | 0 |
| Mitchell | 27 | 5,121 | 5,065–5,334 | 16 |
| Hockley | 11 | 7,650 | 7,189–8,410 | 1 |
| Lynn | 10 | 7,344 | 7,307–7,737 | 0 |
| Yoakum | 10 | 9,439 | 9,149–9,680 | 0 |
| Crane | 9 | 8,393 | 7,896–8,687 | 0 |
| Culberson | 9 | 8,454 | 7,848–8,678 | 0 |
| Scurry | 9 | 4,920 | 4,385–5,376 | 0 |
| Montgomery | 8 | 10,909 | 10,832–11,540 | 0 |
| Loving | 7 | 10,130 | 9,184–11,228 | 0 |
Operators
Current operator of record for wells reporting the top, ranked by wells permitted in the last three years.
| Operator | Last 3 yrs | All |
|---|---|---|
| Diamondback E&P LLC | 205 | 589 |
| Pioneer Natural Res. USA, Inc. | 200 | 4,858 |
| Highpeak Energy Holdings, LLC | 75 | 241 |
| Surge Operating, LLC | 70 | 385 |
| Ovintiv USA Inc. | 65 | 172 |
| Endeavor Energy Resources L.P. | 62 | 1,274 |
| SM Energy Company | 48 | 312 |
| OXY USA Inc. | 40 | 238 |
| Occidental Permian Ltd. | 37 | 160 |
| Hibernia Resources IV, LLC | 36 | 36 |
| Ike Operating, LLC | 34 | 34 |
| XTO Energy Inc. | 33 | 356 |
| Bayswater Operating Company LLC | 32 | 128 |
| Summit Petroleum LLC | 19 | 235 |
| Birch Operations, Inc. | 17 | 234 |
| RP Operating, L.L.C. | 16 | 52 |
| Oxyrock Operating, LLC | 16 | 16 |
| DE IV Operating, LLC | 14 | 45 |
| COG Operating LLC | 13 | 755 |
| Civitas Permian Operating, LLC | 12 | 12 |
| Callon Petroleum Operating Co | 9 | 252 |
| Vital Energy, Inc. | 8 | 16 |
| Firebird Energy II LLC | 7 | 7 |
| Apache Corporation | 6 | 505 |
| EOG Resources, Inc. | 6 | 219 |
Recently permitted wells reporting the Dean
BY LAST PERMIT ISSUED
About this data
Formation tops, elevations, perforations, and casing from the RRC dbf900 wellbore file, refreshed weekly, with reported names normalized to Petrora's formation registry. County and operator breakdowns are rebuilt nightly.
Developers: this page as JSON is GET /v1/data/formations/dean, documented in the API reference.