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Historic Fields

Field Guides

America’s Historic Oil Fields

The giant fields that built the American oil industry — and, thanks to waterfloods, CO2 injection, and modern redevelopment, are still paying royalties today. Each guide covers the field’s history, its enhanced-recovery story, live state production data, and what it all means if you own minerals there.

Texas

Yates FieldDisc. 1926A 1926 Permian giant on the Central Basin Platform that is still producing millions of barrels a year a century later.Pecos County — Gravity drainage + CO2 injection
SACROC Unit (Kelly-Snyder Field)Disc. 1948The Scurry County Canyon Reef giant where large-scale CO2 flooding in America began in 1972 — and never stopped.Scurry County · Kent County — CO2 flood (longest-running in the US)
East Texas Oil FieldDisc. 1930Dad Joiner’s 1930 Woodbine discovery — the largest conventional oil field in the contiguous United States.Gregg County · Rusk County · Upshur County · Smith County · Cherokee County — Natural water drive + salt-water reinjection
North Robertson UnitDisc. 1949A Gaines County Clear Fork carbonate flood that shows how CO2 revives "tired" shallow-shelf reservoirs.Gaines County — CO2 flood (WAG)
Wasson FieldDisc. 1936A 1930s San Andres giant on the Northwest Shelf, home to one of the largest CO2 floods on earth.Yoakum County · Gaines County — CO2 flood (Denver Unit and others)
Slaughter FieldDisc. 1936A hundred-thousand-acre San Andres sprawl across the South Plains, flooded patiently for seventy years.Hockley County · Cochran County · Terry County — Waterfloods + CO2 projects across many units
Seminole San Andres UnitDisc. 1936Gaines County’s flagship CO2 flood — nearly seven million barrels a year from a 1936 discovery.Gaines County — CO2 flood (WAG)
Cogdell Area UnitDisc. 1949SACROC’s northern neighbor on the Horseshoe Atoll — a Canyon Reef flood with its own long CO2 story.Scurry County · Kent County — CO2 flood
Salt Creek FieldDisc. 1950A Kent County Canyon Reef flood on the Horseshoe Atoll — smaller than SACROC, engineered just as hard.Kent County · Scurry County — CO2 flood
Goldsmith FieldDisc. 1935An Ector County stalwart producing from stacked carbonate pays since 1935, with CO2 revival projects still being drilled.Ector County · Andrews County — Waterfloods + San Andres CO2 units
Hawkins FieldDisc. 1940Wood County’s Woodbine giant, managed for eighty years with one of the most studied gravity-drainage programs in the industry.Wood County — Gravity drainage + inert-gas crestal injection
Spraberry TrendDisc. 1949Once mocked as "the largest uneconomic oil field in the world" — now the beating heart of the Midland Basin.Midland County · Martin County · Upton County · Reagan County · Glasscock County — Horizontal redevelopment of a legacy trend
McElroy FieldDisc. 1926A century-old Grayburg giant on the Central Basin Platform, kept alive by one of the Permian’s largest waterfloods.Crane County · Upton County — Waterflood
North Ward Estes FieldDisc. 1929A shallow-sand giant near Monahans, discovered in 1929 and given a second life by one of the Permian’s major CO2 floods.Ward County · Winkler County — CO2 flood
Means FieldDisc. 1934An Andrews County San Andres giant, discovered in 1934 and home to one of the industry’s benchmark CO2 WAG floods.Andrews County — CO2 flood (WAG)
Levelland FieldDisc. 1945Slaughter’s twin on the Northwest Shelf — a 1945 San Andres discovery that grew into one of West Texas’s great flood complexes.Hockley County · Cochran County — Waterflood + CO2
Keystone FieldDisc. 1935Winkler County’s stacked-pay giant — shallow Colby sand to deep Ellenburger — producing since the mid-1930s.Winkler County — Waterflood + gas injection
Fullerton FieldDisc. 1942A 1942 Clearfork discovery in northwestern Andrews County, sustained for decades by a giant unitized waterflood.Andrews County — Waterflood
North Cowden FieldDisc. 1930A 1930 Grayburg–San Andres giant northwest of Odessa, kept flowing by some of the Central Basin Platform’s biggest floods.Ector County — Waterflood + CO2
South Cowden FieldDisc. 1933The southern anchor of the Cowden–Foster–Johnson trend, producing since 1933 and home to a pioneering horizontal-well CO2 flood.Ector County — Waterflood + CO2
Dune FieldDisc. 1938A 1938 Grayburg discovery on University Lands, developed with some 900 wells in the heart of the Central Basin Platform flood fairway.Crane County — Waterflood
Sand Hills FieldDisc. 1930A multi-reservoir Crane County giant producing since 1930 from Tubb and McKnight carbonates and deeper Ordovician pays.Crane County — Waterflood
Waddell FieldDisc. 1927One of Crane County’s original 1920s giants, producing Grayburg–San Andres oil from the storied Waddell Ranch for nearly a century.Crane County — Waterflood
Block 31 FieldDisc. 1945The 1945 Devonian discovery where Atlantic launched the world’s first high-pressure miscible gas flood in 1949.Crane County — High-pressure miscible gas flood
Dollarhide FieldDisc. 1945A 1945 stacked-pay discovery on the western Central Basin Platform, kept climbing by a decades-long Devonian CO2 flood.Andrews County — CO2 flood (WAG)
Fuhrman-Mascho FieldDisc. 1930The field that opened Andrews County in 1930 — shallow San Andres pay reborn through modern horizontal redevelopment.Andrews County — Waterflood + horizontal redevelopment
Conroe FieldDisc. 1931The 1931 George Strake discovery over a deep-seated salt dome that briefly ranked as one of the largest oil fields in the United States.Montgomery County — Pressure maintenance and waterflood; later CO2 flood interest
Hastings FieldDisc. 1934A 1934 Frio giant south of Houston that became one of the anchor CO2 flood projects on the Texas Gulf Coast.Brazoria County · Galveston County — Waterflood followed by CO2 flood
Thompson FieldDisc. 1921A deep-seated salt dome giant southwest of Houston, opened in 1921 and enormously enlarged by the Frio discovery of the early 1930s.Fort Bend County — Waterflood and pressure maintenance
Tom O’Connor FieldDisc. 1934Discovered in 1934 beneath a South Texas ranch, Tom O’Connor became the largest sand-reservoir oil field on the Texas Gulf Coast.Refugio County — Waterflood with gas reinjection
Webster FieldDisc. 1937A 1937 Frio giant beneath the Clear Lake suburbs, unitized and waterflooded in the 1970s and still producing beneath developed land.Harris County — Unitized waterflood
West Ranch FieldDisc. 1938A 1938 Frio field in Jackson County that became the injection site for one of the largest power-plant carbon capture projects ever built.Jackson County — Waterflood and CO2 flood
Van FieldDisc. 1929The 1929 Woodbine discovery that became the first completely unitized oil field in Texas and a model for conservation-minded development.Van Zandt County — Waterflood and pressure maintenance under unit operation
Talco FieldDisc. 1936A 1936 Paluxy heavy oil field strung along the Mexia-Talco fault zone at the north end of the East Texas Basin.Franklin County · Titus County — Waterflood with large produced water volumes
Fairway FieldDisc. 1960A 1960 James Limestone reef discovery in East Texas that was unitized with unusual speed and became a model for reef development.Anderson County · Henderson County — Unitized waterflood with pressure maintenance
Anahuac FieldDisc. 1935A 1935 Frio discovery on a deep-seated Chambers County dome that produced hundreds of millions of barrels near Galveston Bay.Chambers County — Waterflood and pressure maintenance
Goose Creek FieldDisc. 1916The Baytown field whose 1916 gusher opened Galveston Bay to drilling and produced the first American court fight over oilfield subsidence.Harris County — Primary production with limited later injection
Sour Lake FieldDisc. 1901The Hardin County salt dome field where the Texas Company struck its fortune in 1903 and where wells have produced ever since.Hardin County — Primary production with later flank development
Hull FieldDisc. 1918A Liberty County salt dome field opened in 1918 that has produced from stacked flank sands for more than a century.Liberty County — Primary production with infill drilling and workovers
West Columbia FieldDisc. 1918The Brazoria County salt dome field that boomed in 1920 on Governor Hogg’s old plantation acreage and still produces a century later.Brazoria County — Primary production with later flank development
Panhandle FieldDisc. 1921A 1921 discovery on the Amarillo Uplift that grew into one of the world’s great oil and gas districts across eight Panhandle counties.Gray County · Carson County · Hutchinson County · Wheeler County — Primary + waterflood
Howard-Glasscock FieldDisc. 1925A 1925 Permian discovery on the Eastern Shelf that has passed 400 million barrels and is still being redeveloped on tight infill spacing.Howard County · Glasscock County — Waterflood + infill redevelopment
Prentice FieldDisc. 1950A Northwest Shelf Clear Fork and Glorieta complex broken into several waterflood units, with more than 200 million barrels produced.Terry County · Yoakum County — Waterflood
Midland Farms FieldDisc. 1945An Andrews County San Andres and Grayburg field on the Fasken land grant, with stacked Ellenburger pay found beneath it in 1952.Andrews County — Waterflood
Mabee FieldDisc. 1943A 1943 San Andres field beneath the Mabee Ranch in Andrews and Martin counties, under miscible CO2 flood since January 1992.Andrews County · Martin County — Waterflood + miscible CO2
Westbrook FieldDisc. 1920The Mitchell County discovery that started the Permian Basin in 1920, and where two thirds of the oil produced came from waterflooding.Mitchell County — Waterflood
Hendrick FieldDisc. 1926The 1926 Winkler County discovery that built the town of Wink, peaked at 5.3 million barrels in a single month, and made 261 million in all.Winkler County — Primary + gas injection
Iatan-East Howard FieldDisc. 1926A 1926 discovery straddling the Howard-Mitchell county line that has produced continuously for a century from thin, fractured shallow pay.Howard County · Mitchell County — Waterflood
Sharon Ridge FieldDisc. 1923A shallow Scurry and Mitchell county field with depth-named Clearfork reservoirs and a Canyon Reef unit tied into the Permian CO2 system.Scurry County · Mitchell County — Waterflood + CO2 injection
Diamond M FieldDisc. 1948A Horseshoe Atoll Canyon Reef unit next door to SACROC, waterflooded since 1951 and now being evaluated for tertiary recovery.Scurry County — Waterflood; tertiary recovery under evaluation
Penwell FieldDisc. 1929A shallow Central Basin Platform San Andres field southwest of Odessa, with a deep stack of separately designated reservoirs beneath it.Ector County — Waterflood
Welch FieldDisc. 1941A Dawson County San Andres field that pioneered pilot waterflooding in 1955 and moved to miscible CO2 in the South Welch Unit.Dawson County — Waterflood + miscible CO2
TXL FieldDisc. 1944An Ector County multi-pay field on Texas Pacific Land acreage, with seven separately designated reservoirs and about 270 million barrels.Ector County — Waterflood + horizontal Clearfork and Tubb redevelopment
Anton-Irish FieldDisc. 1944A Clear Fork field on the Matador Arch northwest of Lubbock, gas-injected since 1951, waterflooded from 1969 and CO2 flooded since 1997.Hale County · Lamb County — Waterflood + miscible CO2
Eagleville Field (Eagle Ford)Disc. 2009The Railroad Commission designation covering the heart of the Eagle Ford oil window — once the number one US oil field by proved reserves.Karnes County · DeWitt County · Gonzales County · La Salle County — Horizontal shale (multi-stage frac)
Phantom (Wolfcamp) FieldDisc. 2011The consolidated Railroad Commission designation behind much of the Delaware Basin horizontal boom in Ward, Reeves and Loving counties.Ward County · Reeves County · Loving County — Horizontal shale (multi-stage frac)
Sugarkane FieldDisc. 2009A condensate-rich core Eagle Ford field spanning DeWitt, Karnes and Live Oak counties, developed almost entirely with horizontal wells.DeWitt County · Karnes County · Live Oak County — Horizontal shale (multi-stage frac)
Briscoe Ranch FieldDisc. 2009A western Eagle Ford field across Dimmit, La Salle and Frio counties that ranked among the top US oil fields by proved reserves.Dimmit County · La Salle County · Frio County — Horizontal shale (multi-stage frac)
Hawkville FieldDisc. 2008The La Salle County field where Petrohawk proved the Eagle Ford in 2008 — condensate-heavy rock that launched a national shale play.La Salle County · McMullen County · Webb County — Horizontal shale (multi-stage frac)
Giddings FieldDisc. 1960The Central Texas Austin Chalk field where horizontal drilling first proved itself economically — and which modern completions revived.Burleson County · Washington County · Fayette County · Lee County — Horizontal redevelopment
Burkburnett FieldDisc. 1912The Wichita County boomtown field of 1918 that inspired a Hollywood film and still supports shallow stripper production today.Wichita County — Primary and waterflood
Electra FieldDisc. 1911North Texas’s first great oil field, opened by the 1911 Clayco No. 1 near the Waggoner ranch and still dotted with working pump jacks.Wichita County · Wilbarger County — Primary and waterflood
KMA FieldDisc. 1931A 1930s North Texas waterflood field on the Wichita-Archer county line, still producing from the shallow KMA sand.Wichita County · Archer County — Waterflood
Big Lake FieldDisc. 1923Reagan County field opened by Santa Rita No. 1 in 1923 — the discovery that proved the Permian Basin and endowed the University of Texas.Reagan County — Primary and waterflood
Luling-Branyon FieldDisc. 1922Edgar B. Davis’s 1922 Central Texas discovery along the Luling fault zone — century-old Edwards lime strippers still pumping today.Caldwell County · Guadalupe County — Waterflood
Pearsall FieldDisc. 1936A 1930s South Texas chalk discovery that became a proving ground for horizontal drilling when Oryx Energy arrived in 1989.Frio County · Zavala County · Dimmit County — Horizontal redevelopment
Seeligson FieldDisc. 1937A 1937 South Texas giant on King Ranch country — a condensate-rich Frio and Vicksburg complex with a long, gentle production tail.Jim Wells County · Kleberg County — Primary and gas cycling
Tomball FieldDisc. 1933The 1933 Harris County discovery that made Tomball “Oil Town U.S.A.” and won the town ninety years of free gas and water.Harris County — Primary
Humble FieldDisc. 1905The Harris County salt dome field that gushed in January 1905, dominated early Texas production and gave Humble Oil its name.Harris County — Primary
Saratoga FieldDisc. 1901A Big Thicket salt dome field first drilled commercially in 1901, now a deep-decline stripper property in Hardin County.Hardin County — Primary
Barbers Hill FieldDisc. 1916A Chambers County salt dome that has produced oil since 1918 and later became a major hydrocarbon storage center at Mont Belvieu.Chambers County — Primary depletion
Big Wells FieldDisc. 1969A late-1960s San Miguel sand discovery in the Maverick Basin that briefly made Big Wells one of the busiest towns in the Winter Garden.Dimmit County · Zavala County — Waterflood
Darst Creek FieldDisc. 1929The Guadalupe County half of the Luling trend — shallow Edwards limestone wells that have pumped along the fault zone for a century.Guadalupe County — Waterflood
Dora Roberts FieldDisc. 1954A 1950s Devonian discovery on the Midland-Ector county line, developed as a waterflood and worked quietly ever since.Midland County · Ector County — Waterflood
Emma FieldDisc. 1937One of five Andrews County fields opened in the 1930s — a San Andres carbonate waterflooded on the Central Basin Platform.Andrews County — Waterflood
Greta FieldDisc. 1928The Refugio County field that gave its name to the Greta sand — the Frio barrier-bar reservoir behind much of the Texas Gulf Coast’s oil.Refugio County — Waterflood
Headlee FieldDisc. 1953A deep Devonian field on the Ector-Midland line, developed in the 1950s and produced with gas injection rather than water.Ector County · Midland County — Gas injection
Jordan FieldDisc. 1937A San Andres field on the Central Basin Platform between Odessa and Crane, developed in the 1930s and waterflooded for most of its life.Ector County · Crane County — Waterflood
Kermit FieldDisc. 1928Shallow Permian production in Winkler County, opened in the wake of the 1926 Hendrick discovery that created Wink and Kermit.Winkler County — Primary and waterflood
McCamey FieldDisc. 1925George B. McCamey’s 1925 wildcat put a tent city of ten thousand people on the Upton County plains within six months.Upton County — Waterflood
Monahans FieldDisc. 1929Shallow Permian production in the sand hills of Ward and Winkler counties, opened during the boom the Hendrick field set off in 1926.Ward County · Winkler County — Waterflood
Neches FieldDisc. 1953A Woodbine sand field on the western side of the East Texas Basin, found in the 1950s and waterflooded through a long, quiet maturity.Anderson County — Waterflood
Old Ocean FieldDisc. 1934Jim Abercrombie’s 1934 discovery on the Brazoria-Matagorda line — a deep, condensate-rich Frio field that got its own wartime refinery.Brazoria County · Matagorda County — Gas cycling and pressure maintenance
Pegasus FieldDisc. 1949A deep multi-pay anticline on the Midland-Upton line, stacking Spraberry, Devonian and Ellenburger production in one structure.Midland County · Upton County — Gas injection and waterflood
Raccoon Bend FieldDisc. 1927The 1927 field northeast of Bellville that turned Austin County into an oil county and produced steadily for more than half a century.Austin County — Waterflood
Russell FieldDisc. 1946A multi-pay Gaines County field stacking Clearfork and Devonian production, developed after the war and waterflooded ever since.Gaines County — Waterflood
Salt Flat FieldDisc. 1928A Caldwell County field that followed Edgar B. Davis’s Luling discovery — shallow Edwards limestone, still pumping a century later.Caldwell County — Waterflood
Shafter Lake FieldDisc. 1946A postwar San Andres discovery in northwestern Andrews County, developed during the decade that added ninety fields to the county map.Andrews County — Waterflood
Toborg FieldDisc. 1959A shallow heavy-oil field on the southern rim of the Permian Basin in Pecos County, worked at low rates with water injection.Pecos County — Waterflood
Walnut Bend FieldDisc. 1938A North Texas field in the Red River bend country of Cooke County, producing from Pennsylvanian sands since the late 1930s.Cooke County — Waterflood
Wellman FieldDisc. 1950A Wolfcamp reef reservoir in Terry County — a compact, thick carbonate buildup on the northwestern shelf of the Permian Basin.Terry County — Waterflood

California

Midway-SunsetDisc. 1894California’s largest oil field — a steam-driven giant near Taft producing since 1894Kern County — Steam flood
Kern RiverDisc. 1899The world’s reference steam flood — over two billion barrels from shallow sands near BakersfieldKern County — Steam flood
South BelridgeDisc. 1911A top-five American field by cumulative output — Tulare steam floods above a vast diatomite resourceKern County — Steam flood and diatomite waterflood
Elk HillsDisc. 1911Naval Petroleum Reserve No. 1 turned CRC flagship — oil, gas, and a century of American historyKern County — Waterflood and gas injection
WilmingtonDisc. 1932America’s third-largest oil field, hidden beneath Long Beach harbor and four island drill sitesLos Angeles County — Waterflood (subsidence control)
CoalingaDisc. 1887One of California’s original oil giants — producing at Coalinga since the 1880s, steamed since the 1960sFresno County — Steam flood
CymricDisc. 1909A 1909 discovery that peaked ninety years later — Chevron steam turned Cymric into a modern top producerKern County — Steam flood
Lost HillsDisc. 1910A century-old Kern County field where diatomite drilling, steam, and waterflood keep the checks comingKern County — Steam flood and waterflood
San ArdoDisc. 1947The Salinas Valley’s heavy-oil giant — steam-flooded Lombardi and Aurignac sands beside the Salinas RiverMonterey County — Steam flood
Buena VistaDisc. 1909Naval Petroleum Reserve No. 2 — a century-old Kern County anticline still producing oil and gasKern County — Primary and waterflood
Ventura (Ventura Avenue)Disc. 1919Over a billion barrels from California’s greatest anticline, in the hills above the city of VenturaVentura County — Waterflood
Huntington BeachDisc. 1920Over a billion barrels beneath Surf City — from the 1920 boom to slant wells tapping sands under the seaOrange County — Waterflood
Long Beach (Signal Hill)Disc. 1921Alamitos No. 1 blew in on Signal Hill in 1921 and created, per acre, the richest oil field the world had seenLos Angeles County — Waterflood
Brea-OlindaDisc. 1880Producing since 1880 in the Puente Hills — the first of California’s fifty largest oil fields to be foundOrange County · Los Angeles County — Primary and waterflood
North BelridgeDisc. 1912The smaller northern twin of South Belridge — shallow steam sands over a deep diatomite sectionKern County — Steam flood, waterflood, and gas injection
Cat CanyonDisc. 1908A 1908 Solomon Hills heavy-oil giant where the Monterey shale is both source rock and reservoirSanta Barbara County — Cyclic steam and steam flood
EdisonDisc. 1928A 1928 Kern County field where oil is trapped in Miocene sands and in fractured basement schistKern County — Waterflood and cyclic steam
FruitvaleDisc. 1928A city field — Bakersfield grew over the top of it, and the wells are still thereKern County — Waterflood, cyclic steam, and fireflood
GreeleyDisc. 1936A deep Stevens turbidite pool on the valley floor northwest of BakersfieldKern County — Waterflood
InglewoodDisc. 1924The largest urban oil field in the country — a working field inside Los Angeles’ Baldwin HillsLos Angeles County — Waterflood and cyclic steam
Kern FrontDisc. 1912Kern River’s quieter neighbor — 14-gravity crude from Etchegoin and Chanac sands since 1912Kern County — Cyclic steam and steam flood
McKittrickDisc. 1896Where San Joaquin oil started — tar seeps, the 1896 Shamrock gusher, and a century of steamKern County — Steam flood, fire flood, and waterflood
Mount PosoDisc. 1926A Sierra-foothill heavy-oil field that Shell turned into one of California’s big steam floodsKern County — Steam flood
Mountain ViewDisc. 1933A fragmented stripper field beneath Arvin, run by dozens of small independentsKern County — Primary with pumped lift
OrcuttDisc. 1901Union Oil’s first great California discovery — Old Maud, the Solomon Hills, and heavy Monterey crudeSanta Barbara County — Waterflood, gas injection, and thermal methods
Poso CreekDisc. 1926A compact, hard-worked steam flood in the Kern County foothills north of BakersfieldKern County — Steam flood and cyclic steam
RichfieldDisc. 1919A northeast Orange County field that shares its name with the old Richfield Oil CompanyOrange County — Waterflood
Rincon (Onshore)Disc. 1927A Pico Formation coastal field between Ventura and Carpinteria, waterflooded since 1961Ventura County — Waterflood
Rio BravoDisc. 1937A deep light-oil pool that broke the rule that Kern County oil has to be heavyKern County — Waterflood
Round MountainDisc. 1927A Sierra-foothill field of heavy and medium crude, worked entirely by independentsKern County — Waterflood and cyclic steam
Santa Fe SpringsDisc. 1919One of the three great 1920s Los Angeles gusher fields, alongside Signal Hill and Huntington BeachLos Angeles County — Waterflood
Santa Maria ValleyDisc. 1934A 1934 Union Oil discovery lying directly beneath the city of Santa MariaSanta Barbara County — Cyclic steam
Seal BeachDisc. 1924A 1920s coastal field spanning the Orange and Los Angeles county line near the mouth of the San Gabriel RiverOrange County · Los Angeles County — Waterflood
South MountainDisc. 1916A Sespe Formation waterflood on the flank of South Mountain, producing since 1916Ventura County — Waterflood

Oklahoma

Sho-Vel-Tum FieldDisc. 1914Oklahoma’s largest oil field complex — over a billion barrels from stacked Pennsylvanian sands in Stephens and Carter counties since 1914.Stephens County · Carter County — Waterflood + polymer/ASP pilots
Burbank FieldDisc. 1920The 1920 Osage County giant that funded the Osage Nation’s headrights — more than half a billion barrels and still under active flooding.Osage County · Kay County — Waterflood + CO2 injection
Cushing FieldDisc. 1912The 1912 boom field that once supplied a fifth of America’s oil — and gave its name to the delivery point where WTI is priced today.Creek County — Waterflood
Glenn Pool FieldDisc. 1905The 1905 discovery that made Tulsa the "Oil Capital of the World" — more than 340 million barrels from the Bartlesville sand.Tulsa County · Creek County — Waterflood
Healdton FieldDisc. 1913The shallow 1913 giant they called the "poor man’s field" — cheap to drill, rich in oil, and the proving ground for Halliburton cementing.Carter County — Waterflood
Hewitt FieldDisc. 1919Healdton’s 1919 companion giant — home of the 12,800-barrel-a-day Noble No. 33 and second-largest field in southern Oklahoma.Carter County — Waterflood
Golden Trend FieldDisc. 1945A mid-1940s conventional giant in Garvin County whose stacked pays now sit beneath the horizontal wells of the SCOOP play.Garvin County · Grady County · McClain County — Waterflood + SCOOP horizontals
Sooner Trend FieldDisc. 1945The conventional giant of Oklahoma’s northwest shelf that lent its name — the "S" — to the STACK horizontal play.Kingfisher County · Garfield County · Major County · Logan County — Waterflood + STACK horizontals
Oklahoma City FieldDisc. 1928The 1928 giant that grew up inside a capital city — 750 million barrels, the Wild Mary Sudik gusher, and a well under the Capitol’s flowerbed.Oklahoma County — Primary (strong water drive)
Postle FieldDisc. 1958The Oklahoma Panhandle’s Morrow-sand workhorse — waterflooded since 1967 and swept by one of the state’s few active CO2 floods.Texas County — CO2 flood (WAG)
Allen FieldDisc. 1927One of the six giant fields of the Greater Seminole area — Booch and Calvin sand pay, now a dense waterflooded stripper district.Pontotoc County · Hughes County — Waterflood
Bowlegs FieldDisc. 1927A Seminole County Wilcox giant from the 1927 rush, named for the Seminole leader Billy Bowlegs and long since down to stripper rates.Seminole County — Waterflood
Cement FieldDisc. 1917The Anadarko Basin field whose leaking hydrocarbons bleached the red beds above it — a classic of surface geochemical exploration.Caddo County · Grady County — Waterflood
Earlsboro FieldDisc. 1926A 1926 Wilcox giant on the Seminole-Pottawatomie line, part of the district that briefly out-produced the rest of the country.Seminole County · Pottawatomie County — Waterflood
West Edmond FieldDisc. 1943The wartime Hunton lime discovery north of Oklahoma City, later unitized as one of Oklahoma’s best-known lime units.Oklahoma County · Logan County · Canadian County — Primary with pressure maintenance
Eola-Robberson FieldDisc. 1946A structurally complex Garvin County field producing from Bromide and Oil Creek sands along the faulted margin of the Ardmore Basin.Garvin County — Waterflood
Fitts FieldDisc. 1933A Depression-era Pontotoc County giant with stacked Cromwell, Hunton and Viola pay — long since a waterflooded stripper district.Pontotoc County — Waterflood
Garber FieldDisc. 1916The 1916 Garfield County discovery that opened the Nemaha Ridge trend and gave its name to the Garber sands.Garfield County — Waterflood
Little River FieldDisc. 1927A Seminole County Wilcox pool from the 1927 rush — one of six giant fields the state counts inside the Greater Seminole area.Seminole County — Primary with later water injection
St. Louis FieldDisc. 1926The largest of the Greater Seminole Wilcox pools, straddling the Pottawatomie-Seminole county line east of Shawnee.Pottawatomie County · Seminole County — Waterflood
Seminole City FieldDisc. 1926Where the Greater Seminole boom began — the Fixico No. 1 reached the Wilcox sand at 4,073 feet on July 16, 1926.Seminole County — Primary with later water injection
Tonkawa FieldDisc. 1921The early-1920s Kay and Noble county boom field known as Three Sands, and the namesake of the Tonkawa sand.Kay County · Noble County — Waterflood

Wyoming

Salt Creek Field (Wyoming)Disc. 1889Wyoming’s most storied oil field — producing since 1889, once the world’s largest light-oil field, and under CO2 flood since 2004.Natrona County — CO2 flood
Lost Soldier FieldDisc. 1916The 1916 Bairoil giant producing from Cambrian to Cretaceous — one of the Rockies’ deepest pay stacks, swept by CO2 since the 1980s.Sweetwater County — CO2 flood
Beaver Creek FieldDisc. 1938A 1938 Wind River Basin field whose deep Madison limestone was put under CO2 flood in 2008, lifting rates far above its primary decline.Fremont County — CO2 flood (Madison) + primary sands
Byron FieldDisc. 1918One of the Bighorn Basin’s oldest producers, and the site of the basin’s first full-field commercial polymer flood in the Tensleep-Embar.Big Horn County — Waterflood + polymer flood
Circle Ridge FieldDisc. 1923A 1923 Wind River Basin field on the Wind River Reservation, returned to full tribal ownership when the operator’s lease expired.Fremont County — Primary and waterflood
Cottonwood Creek FieldDisc. 1953A 1953 Phosphoria dolomite field northeast of Worland — one of the first Wyoming discoveries drilled deliberately as a stratigraphic trap.Washakie County — Waterflood, with CO2 recovery studied
Frannie FieldDisc. 1928A northern Bighorn Basin Tensleep field on the Montana line, waterflooded for decades and studied for residual-oil-zone CO2 recovery.Park County · Big Horn County — Waterflood, with ROZ CO2 studied
Garland FieldDisc. 1906The 1906 Frontier discovery that opened the Bighorn Basin, later redefined by deeper Tensleep and Madison pays under injection.Big Horn County · Park County — Waterflood
Grass Creek FieldDisc. 1914One of Wyoming’s five transformational oil fields — a Hot Springs County dome that peaked in 1918 and has produced ever since.Hot Springs County — Waterflood and gas-water injection
Hamilton Dome FieldDisc. 1918A seven-mile anticline near Thermopolis, waterflooded for generations and past 250 million barrels since its 1918 discovery.Hot Springs County — Waterflood (unitized)
Hartzog Draw FieldDisc. 1975A 22-mile Shannon sand-ridge trap found in 1975, unitized in 1980 and waterflooded ever since at 9,000 feet.Campbell County · Johnson County — Waterflood, CO2 miscible considered
Hilight FieldDisc. 1969A 1969 Muddy sandstone field in Campbell County, waterflooded for decades and surrounded by the Powder River horizontal revival.Campbell County — Waterflood
Oregon Basin FieldDisc. 1912A 15-mile eroded anticline southeast of Cody with two domes, nine pay horizons and more than half a billion barrels produced.Park County — Waterflood with horizontal infill
Steamboat Butte FieldDisc. 1943A March 1943 Wind River Basin discovery that ranked among Wyoming’s largest fields by proved reserves within a few years.Fremont County — Waterflood
Wertz FieldDisc. 1936The Bairoil twin of Lost Soldier — a 1936 Sinclair discovery whose Tensleep took CO2 injection in October 1986.Sweetwater County · Carbon County — CO2 miscible flood
Winkleman Dome FieldDisc. 1918A shallow Nugget zone of viscous crude on the Wind River Reservation, produced by forward steam drive since the mid-1960s.Fremont County — Forward steam drive

Colorado

Rangely FieldDisc. 1933Colorado’s largest oil field — a Weber sandstone giant found in 1933, waterflooded in 1958, and under CO2 flood since 1986.Rio Blanco County — CO2 flood (WAG)
Wattenberg FieldDisc. 1970A 1970 J Sandstone discovery in the DJ Basin, reborn after 2009 as one of the largest horizontal oil and gas fields in the United States.Weld County · Adams County · Broomfield County · Boulder County · Larimer County — Horizontal redevelopment

Wyoming & Montana

Elk Basin FieldDisc. 1915The 1915 anticline giant straddling the Wyoming–Montana line — reborn twice as deeper Tensleep and Madison pays came in during the 1940s.Park County · Carbon County — Waterflood

Kansas

Chase-Silica FieldDisc. 1931Kansas’ largest field by cumulative production — a Central Kansas Uplift waterflood on Arbuckle and Lansing-Kansas City pay since 1931.Rice County · Barton County · Stafford County — Waterflood
Trapp FieldDisc. 1936A 300-million-barrel Central Kansas Uplift giant in Russell and Barton counties, now dense stripper-well and small-royalty country.Russell County · Barton County — Waterflood
El Dorado FieldDisc. 1915The 1915 Butler County discovery that supplied much of America’s World War I oil — and still pays royalties from shallow wells.Butler County — Waterflood
Bemis-Shutts FieldDisc. 1928An Ellis County giant on the Central Kansas Uplift — roughly 249 million barrels from about 2,150 wells, and a vast small-interest base.Ellis County — Waterflood
Hall-Gurney FieldDisc. 1931A Russell County landmark: more than 150 million barrels from Lansing-Kansas City limestone, and the first CO2 flood pilot in Kansas.Russell County · Barton County — Waterflood with CO2 pilot
Augusta FieldDisc. 1914The 1914 Butler County discovery that preceded El Dorado and helped establish geological mapping as the way to find oil.Butler County — Waterflood
Kraft-Prusa FieldDisc. 1937A Central Kansas Uplift Arbuckle field whose oil is trapped against buried Precambrian hills — a classic of Kansas subsurface geology.Barton County · Ellsworth County · Russell County — Waterflood

Illinois

Louden FieldDisc. 1937An Illinois Basin giant — roughly 392 million barrels from Cypress and Weiler sandstone, and a proving ground for waterflood technique.Fayette County · Effingham County — Waterflood
Salem Consolidated FieldDisc. 1938Marion County’s 1938 discovery peaked near 261,000 barrels a day in 1940, second largest in the United States, and still pays royalties.Marion County — Waterflood
Clay City Consolidated FieldDisc. 1937A sprawling Illinois Basin giant on the Clay City anticline, credited with more than 350 million barrels across four counties.Clay County · Wayne County · Richland County · Jasper County — Waterflood
Lawrence FieldDisc. 1906Illinois’ oldest giant — producing since 1906 from Bridgeport and Robinson sands, with more than 400 million barrels recovered.Lawrence County · Crawford County — Waterflood with ASP and polymer pilots
New Harmony Consolidated FieldDisc. 1939A Wabash River giant discovered in 1939 — and the backbone of White County, which still leads Illinois in oil production by a wide margin.White County — Waterflood
Dale Consolidated FieldDisc. 1940A deep-basin Illinois field consolidated from several pools, producing from Aux Vases sandstone and O’Hara limestone under waterflood.Hamilton County · Franklin County · Saline County — Waterflood

Mississippi

Tinsley FieldDisc. 1939Mississippi’s first oil field — discovered in 1939 in the Woodruff sand and later the site of the state’s original CO2 flood.Yazoo County — CO2 flood
Heidelberg FieldDisc. 1944A Jasper County landmark since 1944 — Eutaw and Christmas sand production, now sustained by carbon dioxide injection from the Jackson Dome.Jasper County — CO2 flood
Baxterville FieldDisc. 1944Mississippi’s largest field by cumulative oil — more than 250 million barrels from Tuscaloosa and Cretaceous pay in two counties.Lamar County · Marion County — Waterflood
Brookhaven FieldDisc. 1943A southwest Mississippi Tuscaloosa field of the wartime era, long produced under waterflood and now a mature, low-rate asset.Lincoln County — Waterflood
Eucutta FieldDisc. 1944A southeast Mississippi Eutaw field brought back by carbon dioxide from the Jackson Dome — tertiary recovery on a wartime discovery.Wayne County — CO2 flood

Louisiana

Delhi FieldDisc. 1944A north Louisiana field producing since 1944, converted in 2009 to CO2 flooding across roughly 14,000 unitized acres.Franklin County · Richland County · Madison County — CO2 flood
Caddo-Pine Island FieldDisc. 1905One of Louisiana’s oldest fields — a 1905 Caddo Parish discovery that put derricks on the water of Caddo Lake and still produces today.Caddo County — Primary depletion (stripper wells)
Haynesville Oil Field (Claiborne Parish)Disc. 1921A shallow 1921 oil discovery in Claiborne Parish that gave the modern Haynesville Shale its name — and is a different reservoir.Claiborne County — Primary and waterflood
Jennings FieldDisc. 1901The field that started Louisiana’s oil industry — a 7,000-barrel-a-day gusher in an Acadia Parish rice field in September 1901.Acadia County — Primary depletion
Lake Washington FieldDisc. 1931A salt-dome field in the Plaquemines Parish marsh, producing since the 1930s, where access and coastal land loss shape the economics.Plaquemines County — Primary depletion + redevelopment drilling

North Dakota

Parshall FieldDisc. 2006The Mountrail County discovery that turned the Bakken from a geologic curiosity into the biggest onshore oil play in America.Mountrail County — Horizontal drilling + hydraulic fracturing
Sanish FieldDisc. 2007A Mountrail County Bakken field that grew from the 2007 leasing rush into one of the highest cumulative producers in North Dakota.Mountrail County — Horizontal drilling + hydraulic fracturing
Banks FieldDisc. 2008A core McKenzie County Bakken field north of Watford City, developed almost entirely with horizontal wells since 2008.McKenzie County — Horizontal drilling + hydraulic fracturing
Reunion Bay FieldDisc. 2007A Bakken core field straddling the Missouri River arm of Lake Sakakawea across Mountrail and McKenzie counties.Mountrail County · McKenzie County — Horizontal drilling + hydraulic fracturing
Beaver Lodge FieldDisc. 1951Where North Dakota oil began — the 1951 Clarence Iverson discovery south of Tioga on the Nesson Anticline.Williams County — Waterflood + horizontal overlay
Blue Buttes FieldDisc. 1954A 1950s Nesson Anticline field on the southern flank that was drilled a second time for the Bakken half a century later.McKenzie County — Waterflood + horizontal overlay
Grail FieldDisc. 2008A core McKenzie County Bakken field where the reservoir is thick, deep, and heavily overpressured.McKenzie County — Horizontal drilling + hydraulic fracturing
Tioga FieldDisc. 1952The Madison field around the town that North Dakota oil built — and the site of the state’s first major gas processing plant.Williams County · Mountrail County — Waterflood + horizontal overlay
Van Hook FieldDisc. 2008A Bakken core field along the Lake Sakakawea shoreline near New Town, named for a town the Garrison Dam put underwater.Mountrail County — Horizontal drilling + hydraulic fracturing
Antelope FieldDisc. 1953The 1953 McKenzie County field where the Three Forks first produced, long before anyone called it a shale play.McKenzie County — Primary depletion + horizontal overlay
Charlson FieldDisc. 1952A 1952 Nesson Anticline field in northeast McKenzie County that has produced from nearly every formation in the Williston section.McKenzie County — Waterflood + horizontal overlay
Clarks Creek FieldDisc. 2010One of the highest-performing corners of the McKenzie County Bakken, developed entirely with long horizontal laterals.McKenzie County — Horizontal drilling + hydraulic fracturing
Heart Butte FieldDisc. 2008A Dunn County Bakken field inside the Fort Berthold Reservation, where fee, allotted, and tribal minerals sit side by side.Dunn County — Horizontal drilling + hydraulic fracturing
Little Knife FieldDisc. 1976The Mission Canyon discovery that drove North Dakota’s 1970s oil boom across Billings and Dunn counties.Dunn County · Billings County — Primary depletion + horizontal overlay
Siverston FieldDisc. 2008A McKenzie County Bakken field in the deep basin core, drilled exclusively with horizontal wells since 2008.McKenzie County — Horizontal drilling + hydraulic fracturing
Truax FieldDisc. 2008A Williams County Bakken field east of Williston, built entirely on horizontal Middle Bakken and Three Forks wells.Williams County — Horizontal drilling + hydraulic fracturing
Alkali Creek FieldDisc. 2008An NDIC administrative Bakken field on the Mountrail and Williams county line, drilled entirely with horizontal wells.Mountrail County · Williams County — Horizontal drilling + hydraulic fracturing
Camp FieldDisc. 2009A McKenzie County administrative Bakken field where value sits in undrilled inventory rather than in the wells already producing.McKenzie County — Horizontal drilling + hydraulic fracturing
Corral Creek FieldDisc. 2008A Dunn County Bakken field laid out in 1,280-acre spacing units carrying up to seven horizontal wells apiece.Dunn County — Horizontal drilling + hydraulic fracturing

North Dakota & Montana

Cedar Hills FieldDisc. 1995The 1995 horizontal Red River B discovery that made a ten-foot dolomite into one of the largest onshore oil fields in the lower 48.Bowman County · Slope County · Fallon County — Horizontal drilling + high-pressure air injection

Montana

Elm Coulee FieldDisc. 2000The Richland County field that proved horizontal Bakken development worked — years before North Dakota caught on.Richland County — Horizontal drilling + hydraulic fracturing
Bell Creek FieldDisc. 1967A 1967 Muddy sandstone field in southeast Montana given a second life by carbon dioxide flooding.Powder River County — Waterflood → CO2 flood
Cabin Creek FieldDisc. 1953A 1953 Fallon County field on the Cedar Creek Anticline, waterflooded since the 1950s and studied for CO2 recovery since.Fallon County — Waterflood, with CO2 recovery under study
Cut Bank FieldDisc. 1926A 31-mile Sweetgrass Arch field that became Montana’s leading producer in 1936 and still runs on shallow Cut Bank sand.Glacier County — Waterflood
Pennel FieldDisc. 1955A Fallon County Red River field on the Cedar Creek Anticline, past 41 million barrels from stacked Paleozoic carbonates.Fallon County — Waterflood, with CO2 studied
Pine Field (Pine Unit)Disc. 1952The Pine Unit No. 1 came in during January 1952 on a seismic closure — a Red River field spanning four Montana counties.Fallon County · Wibaux County · Dawson County · Prairie County — Waterflood

New Mexico

Vacuum FieldDisc. 1929A 1929 Northwest Shelf giant west of Hobbs — Grayburg and San Andres dolomite worked over by waterflood and then CO2 injection.Lea County — Waterflood + CO2 flood
Eunice-Monument FieldDisc. 1929Discovered in March 1929, a Lea County shelf giant developed through large Grayburg and San Andres waterflood units near Eunice.Lea County — Waterflood
Hobbs FieldDisc. 1928The Midwest State No. 1 found oil on June 13, 1928 at 4,065 feet and turned a Lea County crossroads into New Mexico’s oil capital.Lea County — Waterflood
Empire Abo FieldDisc. 1957A 1957 Abo reef discovery in Eddy County — a textbook gravity-drainage reservoir, produced with crestal gas reinjection since the 1970s.Eddy County — Crestal gas injection / gravity drainage
Maljamar FieldDisc. 1926Named for a founder’s three children, this 1926 Northwest Shelf field became one of New Mexico’s best-documented CO2 flood projects.Lea County · Eddy County — CO2 flood
Langlie-Mattix FieldDisc. 1935A shallow Queen and Grayburg oil pool in southeast Lea County — roughly 1,200 wells across some 60,000 acres, long since waterflooded.Lea County — Waterflood
Denton FieldDisc. 1949A deep Devonian pool in Lea County — smaller than the shelf giants but high in reservoir quality, and long developed as a waterflood.Lea County — Waterflood
Grayburg-Jackson FieldDisc. 1928A shallow Northwest Shelf field in Eddy County producing from Seven Rivers, Queen, Grayburg and San Andres at 1,500 to 4,000 feet.Eddy County — Waterflood
Artesia FieldDisc. 1923New Mexico’s first commercial oil field — the 1923 discovery near Artesia in Eddy County that opened the Permian Basin’s Northwest Shelf.Eddy County — Waterflood

Utah

Greater Aneth FieldDisc. 1956Utah’s largest oil field: a 1956 Paradox Formation discovery in San Juan County, waterflooded from the 1960s and later under CO2 injection.San Juan County — Waterflood + CO2 flood
Altamont-Bluebell FieldDisc. 1970A deep, naturally fractured, highly overpressured giant spanning 500 square miles of Duchesne and Uintah counties, producing since 1970.Duchesne County · Uintah County — Primary + horizontal redevelopment
Monument Butte FieldDisc. 1964Discovered in 1964 and waterflooded since 1987 — the Uinta Basin’s benchmark project for recovering high-paraffin Green River crude.Duchesne County · Uintah County — Pattern waterflood
Red Wash FieldDisc. 1951An eastern Uinta Basin stratigraphic trap producing from more than eighty zones in the lower Green River formation of Uintah County.Uintah County — Waterflood

Florida

Jay FieldDisc. 1970Florida’s largest oil field — a June 1970 Jurassic discovery near Jay, producing from deep Smackover and Norphlet under nitrogen injection.Santa Rosa County · Escambia County — Nitrogen miscible WAG

Michigan

Albion-Scipio FieldDisc. 1957Michigan’s largest oil trend — a narrow belt of hydrothermal dolomite following a basement fracture zone across three southern counties.Calhoun County · Hillsdale County · Jackson County — Primary depletion

New York

Allegany FieldDisc. 1879New York’s oil country — the 1880s Richburg and Bolivar boom district, waterflooded for more than a century and now barely producing.Allegany County · Cattaraugus County — Waterflood

Pennsylvania and New York

Bradford Oil FieldDisc. 1871The oldest large American oil field still on production — Penn Grade crude from the Bradford Third sand, at a few barrels a day per well.McKean County · Cattaraugus County — Waterflood (pattern flooding)

Kentucky

Big Sinking FieldDisc. 1918Kentucky’s largest oil field — thousands of shallow "Corniferous" wells along the Irvine-Paint Creek fault, at stripper rates.Lee County · Estill County — Primary with CO2 and cyclic pilots

Ohio

East Canton FieldDisc. 1947Ohio’s largest oil field — a tight Clinton sandstone district drilled with thousands of shallow, very low-rate wells.Stark County · Carroll County · Tuscarawas County — Primary depletion (CO2 studied)

Louisiana & Texas

Rodessa FieldDisc. 1930The tri-state boom field of the mid-1930s, straddling the Louisiana line into Cass and Marion counties, Texas.Caddo County · Cass County · Marion County — Primary depletion

Arkansas

Smackover FieldDisc. 1922The 1922 Arkansas boom giant whose deep Jurassic brine now underpins the American bromine industry and a new lithium rush.Union County · Ouachita County — Primary and waterflood; brine production
Magnolia FieldDisc. 1938A 1938 Columbia County discovery that became one of the largest producing fields of the early war years in the Smackover lime.Columbia County — Pressure maintenance and waterflood

Alabama

Citronelle FieldDisc. 1955Alabama’s only field to pass 100 million barrels — a 1955 Rodessa discovery in Mobile County now producing at stripper rates.Mobile County — Waterflood; CO2 storage test on site

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