Every active oil and gas formation and play in Colorado — Muddy J Sand, D Sand, Niobrara East, Piceance Basin, Pierre -Niobrara, Denver Basin, and more — ranked by well count, with the top operators and primary counties for each.
Refreshed monthly from ECMC well records. Data current as of 2026-08-23.
Quick answer: The most-targeted oil and gas formations in Colorado are the Muddy J Sand, D Sand, Niobrara East, Piceance Basin and Pierre -Niobrara, led by the Muddy J Sand with 52,469 wells on record. Ranked by well count across 24 tracked formations from Colorado Energy & Carbon Management Commission (ECMC) well-header records (as of 2026-08-23) and refreshed monthly.
As of 2026-08-23, the most-developed Colorado formation is the Muddy J Sand with 52,469 wells on record, across 24 tracked formations, per Colorado Energy & Carbon Management Commission (ECMC) well records.
Top Operators:
Noble Energy (9,898), Kerrmcgee (9,073), Pdc Energy (7,689), Crestone Peak Resources Operating (2,191), Extraction Oil & Gas (1,531), K P Kauffman Company (1,419), Bonanza Creek Energy Operating Company (1,103), Bison Iv Operating LLC (998), Highpoint Operating (951), Prairie Operating CO LLC (615)
Primary counties: Weld, Adams, Morgan, Arapahoe, Larimer
Top Operators:
Padco (446), British American Oil Production Company (315), Allison Drilling Company (261), Tiger Oil Company (236), Exeter Drilling Company (205), Plains Exploration & Production Company (205), Impetro Resources (196), Kimbark Oil & Gas Company (193), Pcr Operating (182), Petroleum (172)
Primary counties: Washington, Logan, Morgan, Adams, Arapahoe
Top Operators:
Own Resources Operating (3,440), Omimex Petroleum (477), J W Operating Company (270), Rosewood Resources (235), Wme Yates LLC (212), Pdc Energy (141), Noble Energy (128), Berry Petroleum Company (128), Samedan Oil (113), Rosetta Resources Operating (79)
Primary counties: Yuma, Phillips, Kit Carson, Sedgwick
Top Operators:
Scout Energy Management (1,162), Tep Rocky Mountain (212), Qb Energy Operating LLC (191), Laramie Energy (160), Twin Arrow (158), Vision Energy Group (119), Sg Interests I (116), Fram Operating (90), Chevron (73), Diamond Back Drilling & Supply (72)
Primary counties: Rio Blanco, Mesa, Garfield, Gunnison, Delta
Top Operators:
Evergreen Natural Resources LLC (2,504), Ogris Operating LLC (536), Pioneer Natural Resources (233), High River Resources Operating LLC (149), Evergreen Operating (107), Petroglyph Operating Company (80), Tep Rocky Mountain (65), Xto Energy (56), Red River Ranch Holdings (51), Cedar Ridge (44)
Primary counties: Las Animas, Huerfano
Top Operators:
Kerrmcgee (699), Pdc Energy (518), Noble Energy (315), Crestone Peak Resources Operating (224), Bison Iv Operating LLC (208), Verdad Resources (170), Extraction Oil & Gas (105), Prairie Operating CO LLC (82), Bonanza Creek Energy Operating Company (65), Javernick Oil (58)
Primary counties: Weld, Fremont, Lincoln, Adams, Arapahoe
Top Operators:
Mull Drilling Company (487), Anadarko Petroleum (435), Citation Oil & Gas (220), Murfin Drilling (121), Txo Production (104), Strachan Exploration (69), Wiepkingfullerton Energy (64), Poandg Operating (58), Texas Oil & Gas (57), Champlin Petroleum Company (55)
Primary counties: Cheyenne, Kiowa, Kit Carson, Bent, Otero
Top Operators:
Simcoe LLC (917), Red Willow Production Company (358), Hilcorp Energy Company (266), Enduring Resources (113), Logos Operating (83), Bpx Operating Company (71), Pineland Operating Company LLC (61), Arco Oil & Gas Company (45), Maralex Resources (39), Abundance Energy Services LLC (39)
Primary counties: La Plata
Top Operators:
Utah Gas Op LTD Dba Utah Gas (693), Locin Oil (373), Conocophillips Company (83), Coseka Resources (82), Chandler & Associates (81), Encana Oil & Gas (78), Kgh Operating Company (47), Mitchell Energy (37), Fuel Resources Development Company (32), Robert L Bayless Producer (27)
Primary counties: Rio Blanco, Garfield, Mesa
Top Operators:
Simcoe LLC (332), Red Willow Production Company (208), Catamount Energy Partners (163), Red Mesa Holdings/O&G (76), Hughes William E (76), Hilcorp Energy Company (68), Williford Resources (58), Enduring Resources (55), Petrox Resources (45), Morning Star Oil Company (32)
Primary counties: La Plata, Archuleta, Montezuma
Top Operators:
Simcoe LLC (452), Red Willow Production Company (442), Hilcorp Energy Company (197), Abundance Energy Services LLC (123), Logos Operating (115), Bpx Operating Company (74), Morning Star Oil Company (43), High River Resources Operating LLC (33), Amoco Production Company (28), Pan American Petroleum (25)
Primary counties: La Plata, Archuleta
Top Operators:
Kinder Morgan Co2 CO LLC (241), American Helium LLC (161), Highpoint Operating (67), Mesa Verde Drilling (60), Bush Drlg Company (47), Seeley Oil Company (34), Shell Oil Company (31), Wright Robertllc (30), Patara Oil & Gas (29), Cabot Oil & Gas (27)
Primary counties: Montezuma, San Miguel, Dolores, Montrose, La Plata
Top Operators:
Colorado Interstate Gas Company (80), Horizon Oil & Gas Company (65), Dover Atwood (58), Murfin Drilling (57), Berry Walter V Dba Berry Energy (51), Txo Production (42), Samson Resources Company (38), Energy Alliance Company (35), Sovereign Operating Company (32), The Marlin Oil (32)
Primary counties: Baca, Prowers, Cheyenne, Kiowa
Top Operators:
Wexpro Company (291), Hilcorp Energy Company (90), Southwestern Energy Production Company (54), Eog Resources (40), Argali Exploration Company (40), Questar Exploration & Production Company (38), Antler Energy (37), Western Gas Resources (37), North Shore Exploration & Production (32), Wolverine Resources LLC (28)
Primary counties: Moffat
Top Operators:
Grmr Oil & Gas (72), Southwestern Energy Production Company (60), Entek Grb (40), Robert L Bayless Producer (29), Pioneer Natural Resources (27), Beeman Oil & Gas (23), Phillips Petroleum Company (20), Texas Company (20), Texaco Exploration And Production (17), Petroleum Resources (17)
Primary counties: Moffat, Routt
Top Operators:
K P Kauffman Company (121), Fulcrum Energy Operating LLC (114), Conocophillips Company (57), Bonanza Creek Energy Operating Company (42), Nielson & Associates (39), North Park Energy (30), Continental Oil Company (25), Cm Production (21), Sandridge Exploration & Production (21), Noffsinger Manufacturing Company (20)
Primary counties: Jackson
Top Operators:
Texaco Exploration And Production (36), Conocophillips Company (36), Cabot Oil & Gas (27), Anschutz Exploration (23), Wesco Operating (19), Beeman Oil & Gas (13), Andrikopoulos Resources A G (12), Poci (11), Eastern American Energy (10), Grmr Oil & Gas (10)
Primary counties: Moffat, Routt, Rio Blanco
Top Operators:
Public Service Company Of Colorado (39), Prospect Energy (11), Wissota Petroleum (9), Petrocanada Resources (7), Western Gas Supply Company (5), Union Oil Company Of California (4), Western Petroleum Company (4), Hs Resources (4), Energy & Carbon Management Commission (4), Martin Exploration Company (3)
Primary counties: Boulder, Larimer, Jefferson
Top Operators:
Oxy (39), Bnl Enterprise INC (19), Arco Oil & Gas Company (15), Desert Eagle Operating LLC (15), Atlantic Richfield Company (11), Helium Company (8), Energy & Carbon Management Commission (7), Addington & Associates H W (6), Skelly Oil Company (6), Nsc Helium Colorado LLC (5)
Primary counties: Las Animas, Huerfano, Custer, Otero
Top Operators:
Fulcrum Energy Operating LLC (30), Burton/Hawks (14), Kamphausen Dan (6), Voyager Petroleums (6), Dakota Exploration (5), Mack Petroleum (3), Colorado Pacific Petr (2), Burlington Northern (2), Sandridge Exploration & Production (2), Clayton Oil Company (2)
Primary counties: Jackson, Grand
Top Operators:
Lexam Explorations (7), Waggonerbaldridge Oper (4), Carrwilliam F (2), Champlin Petroleum Company (2), Faith Energy Exploration (2), Wolverine Exploration Company11/Ofb (2), Hunt N B (2), San Luis Valley Oil & Gas (2), Coda Energy (2), Tuckerorrin (2)
Primary counties: Saguache, Rio Grande, Alamosa, Costilla, Conejos
Top Operators:
Red Willow Production Company (14), Hilcorp Energy Company (7), Conocophillips Company (3), Chevron (2), Sg Interests I (2), Epic Energy (1), Palo Petroleum (1), Arco Oil & Gas Company (1), Murchison Trusts (1), Burlington Resources Oil & Gas Company (1)
Primary counties: La Plata
Top Operators:
Shell Oil Company (6), Ep Energy E And P Company (5), South Park Oil & Gas (4), Wapiti Operating (2), Geary William J (2), Mcdannald Oil Company (2), Kramerhuff Drilling (2), Amoco Production Company (2), Jonah Energy (1), Burton/Hawks (1)
Primary counties: Park
Top Operators:
Hackathorn Drilling Company (5), Elgin Carl Oil Company (5), Odessa Natural (3), Arc Drilling & Exploration (1), Bensonmontingreer Drilling (1), Harvey Francisllc (1), Stanford Petroleum (1), Energy & Carbon Management Commission (1), Davis Oil Company (1), Stanfield Jeffie (1)
Primary counties: Ouray, Archuleta
Source: Colorado Energy & Carbon Management Commission (ECMC) well-header records, aggregated by primary play / interpreted formation / basin.
Threshold: Only formations with at least 50 wells are listed (excludes one-off wildcat plays).
Why it matters: Knowing which formation underlies your tract — and which operators are actively drilling that formation — is the foundation of mineral-rights valuation. Stacked-pay plays carry materially different upside than mature single-bench plays.
Refresh cadence: Monthly. Data current as of 2026-08-23.
Cite this dataset
Permanently archived and citable via a DOI on Zenodo (CERN), under a CC BY 4.0 license. DOI: 10.5281/zenodo.21442884 · View on Zenodo
License & attribution: This data is licensed CC BY 4.0. You are free to share and adapt it, including commercially, provided you credit “Buckhead Energy” and link back to this page or the DOI above.
The most-developed formations and plays in Colorado are the Muddy J Sand, D Sand, Niobrara East, Piceance Basin and Pierre -Niobrara, among others. This directory tracks 24 active formations ranked by well count, per Colorado Energy & Carbon Management Commission (ECMC) records.
The Muddy J Sand has the most wells on record in Colorado — 52,469 wells, worked by 1,352 active operators, per ECMC well-header data. This is a well-count ranking, not a reserves or value ranking.
The most active operators in the Muddy J Sand are Noble Energy, Kerr-McGee, PDC Energy, Crestone Peak Resources Operating, Extraction Oil & Gas. Each formation card below lists its top operators by well count.
About 1,487 drilling permits were filed across the tracked Colorado formations in the last 24 months, per ECMC records — a rough measure of where new activity is concentrated.
Your deed and county records determine which formations your mineral rights cover; a tract can own multiple stacked formations. Buckhead Energy can check the geology under your tract against current well and permit data and put a free, no-obligation written offer in writing — this directory is informational only, not a valuation.
The geology under your tract drives your valuation. Get a free written offer based on your specific formation and county.
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State: Colorado
Active formations: 24
Total wells: 104,411
Recent permits: 1,487
Last refresh: 2026-08-23
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