Texas rock formation associated with petroleum deposits
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Eagle Ford Group
Stratigraphic range: Cenomanian-Turonian ~96–90 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Type
Group
Sub-units
Britton Formation, Arcadia Park Shale Formation, Lake Waco Formation, South Bosque Formation, Boquillas Formation
Underlies
Austin Chalk
Overlies
Woodbine Formation or Buda Limestone
Lithology
Primary
Shale
Other
Marl, limestone, sandstone, volcanic ash beds
Location
Region
Texas
Country
United States
Type section
Named for
Eagle Ford, Texas[1]
Named by
Robert T. Hill[1]
Year defined
1887
Eagle Ford stratigraphic columnOutcrop of the Eagle Ford and Austin Chalk Contact off Kiest Blvd, 1/2 mile east of Patriot Pky in Dallas County
The Eagle Ford Group (also called the Eagle Ford Shale) is a sedimentary rock formation deposited during the Cenomanian and Turonian ages of the Late Cretaceous over much of the modern-day state of Texas. The Eagle Ford is predominantly composed of organic matter-rich fossiliferous marine shales and marls with interbedded thin limestones. It derives its name from outcrops on the banks of the West Fork of the Trinity River near the old community of Eagle Ford,[1] which is now a neighborhood within the city of Dallas. The Eagle Ford outcrop belt trends from the Oklahoma-Texas border southward to San Antonio, westward to the Rio Grande, Big Bend National Park, and the Quitman Mountains of West Texas.[2] It also occurs in the subsurface of East Texas and South Texas, where it is the source rock for oil found in the Woodbine, Austin Chalk, and the Buda Limestone,[3] and is produced unconventionally in South Texas and the "Eaglebine" play of East Texas.[4]
The Eagle Ford was one of the most actively drilled targets for unconventional oil and gas in the United States in 2010,[5] but its output had dropped sharply by 2015.[6] By the summer of 2016, Eagle Ford spending had dropped by two-thirds from $30 billion in 2014 to $10 billion, according to an analysis from the research firm Wood Mackenzie. This strike has been the hardest hit of any oil fields in the world. As of 2016, the spending was, however, expected to increase to $11.6 billion in 2017. A full recovery was not expected any time soon.[7]
Fossils are relatively common in Eagle Ford rocks. Vertebrate fossils that have been found in the Eagle Ford include plesiosaurs, mosasaurs, teleost fish, and teeth from sharks and other fish.[8] Invertebrate fossils found in the Eagle Ford include crustaceans, sea urchins, swimming crinoids, ammonites, oysters, inoceramid clams, and other gastropod shells.[9][10]
^ abcHill, R. T. (1887) The topography and geology of the Crosstimbers and surrounding regions in North Texas: American Journal of Science, v. 33, no. 196, pp. 291–303.
^Denne, R. A., Breyer, J. A., Callender, A. D., Hinote, R. E., Kariminia, M., Kosanke, T. H., Kita, Z., Lees, J. A., Rowe, H., Spaw, J. M., and Tur, N. (2016). Biostratigraphic and geochemical constraints on the stratigraphy and depositional environments of the Eagle Ford and Woodbine Groups of Texas: "in" Breyer, J. A. (ed.), The Eagle Ford Shale: A renaissance in U.S. oil production, AAPG Memoir 110, pp. 1–86.
^Surles, M. A. (1987) Stratigraphy of the Eagle Ford Group (Upper Cretaceous) and its source-rock potential in the East Texas Basin: Baylor Geological Studies Bulletin 45, Waco, Texas, 57 p.
^Hentz, T. F., Ambrose, W. A., and Smith, D. C. (2014). Eaglebine play of the southwestern East Texas basin: Stratigraphic and depositional framework of the Upper Cretaceous (Cenomanian-Turonian) Woodbine and Eagle Ford Groups: AAPG Bulletin, v. 98, p. 2551-2580.
^"Eagle Ford Shale - South Texas - Natural Gas & Oil Field" "OilShaleGas.com"
^Jennifer Hiller, "Hard Times Hit Eagle Ford," "San Antonio Express-News," January 3, 2016, pp. 1, A20
^Jennifer Hiller, "Spending in Eagle Ford has dropped by 67 percent", "San Antonio Express-News," July 22, 2016, pp. 1, A6
^Jacobs, L.L., Polcyn, M.J., Winkler, D.A., Myers, T.S., Kennedy, J.G., and Wagner, J.B. (2013) Late Cretaceous strata and vertebrate fossils of North Texas, "in" Hunt, B.B., and Catlos, E.J., eds., Late Cretaceous to Quaternary Strata and Fossils of Texas: Field Excursions Celebrating 125 Years of GSA and Texas Geology, GSA South-Central Section Meeting, Austin, Texas, April 2013: Geological Society of America Field Guide 30, p. 1–13, doi:10.1130/2013.0030(01)
^Moreman, W. L. (1942) Paleontology of the Eagle Ford Group of north and central Texas: Journal of Paleontology, v. 16, p. 192–220.
^Donovan, A. D., T. S. Staerker, A. Pramudito, W. Li, M. J. Corbett, C. M. Lowery, A. M. Romero, and R. D. Gardner (2012) The Eagle Ford outcrops of West Texas: Understanding heterogeneities within unconventional mudstone reservoirs: GCAGS Journal, v. 1, p. 162–185.
The EagleFordGroup (also called the EagleFord Shale) is a sedimentary rock formation deposited during the Cenomanian and Turonian ages of the Late Cretaceous...
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for $160 million. In March 2018, the company sold its assets in the EagleFordGroup to KKR and Venado Oil & Gas. In October 2021, the company acquired...
ConocoPhillips. The company announced major discoveries in 2010 in the EagleFordGroup. In May 2011, the company sold gas-producing properties in South Texas...
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production in the United States included production in Alaska, the EagleFordGroup, the Permian Basin, the Bakken Formation, the Gulf of Mexico and the...
of oil equivalent (2,340,000 GJ) per day, of which 26% was from the EagleFordGroup, 27% was from the Bakken formation, 17% was from Oklahoma, 7% was from...
In the United States, the company's reserves are primarily in the EagleFordGroup area of South Texas and in the deepwater Gulf of Mexico. The company's...
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Trinity Group overlain by the Edwards Group. Upper Cretaceous formations follow, starting with the Del Rio Clay, Buda Limestone, and then the EagleFord Group...
Texas and New Mexico, the Bakken Formation of North Dakota, and the EagleFordGroup of southeast Texas. Gas flaring increased in the United States as measured...
"Ferropectis" is a nodosaurid ankylosaur from the Late Cretaceous (Cenomanian) EagleFordGroup in Texas that was named in a 2018 dissertation by Matt Clemens. The...
formation overlies the Del Rio Formation and is in turn overlain by the EagleFordGroup. The total thickness is about 100 feet (30 m). In trans-Pecos Texas...
ornithocheirid pterosaur from the Upper Cretaceous (Cenomanian–Turonian) EagleFordGroup of Texas" (pdf). Journal of Vertebrate Paleontology. 30 (1): 280–287...
the Del Rio Clay, Buda Limestone, and then the EagleFordGroup. Formations within the Trinity Group include the Hammett Formation, Cow Creek Formation...
The Arcadia Park Shale is a geologic formation within the EagleFordGroup that outcrops in the northern portion of East Texas. It was deposited during...
Cretaceous in modern-day East Texas. It forms the lower half of the EagleFordGroup in the northern portion of East Texas. The formation was named by W...
The Lake Waco Formation is a geologic formation within the EagleFordGroup deposited during the Middle Cenomanian to the Early Turonian of the Late Cretaceous...
County, Wyoming. In June 2014, the company acquired assets in the EagleFordGroup from Freeport-McMoRan for $3.1 billion. In August 2015, the company...
the Del Rio Clay, Buda Limestone, and then the EagleFordGroup. Formations within the Trinity Group include the Hammett Formation, Cow Creek Formation...
Trinity Group overlain by the Edwards Group. Upper Cretaceous formations follow, starting with the Del Rio Clay, Buda Limestone, and then the EagleFord Group...
Trinity Group overlain by the Edwards Group. Upper Cretaceous formations follow, starting with the Del Rio Clay, Buda Limestone, and then the EagleFord Group...
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