Well integrity a fracking concern, British study finds

Well integrity a fracking concern, British study finds

March 25 (UPI) -- A study published Tuesday in the British journal Marine and Petroleum Geology finds underground wells used for shale exploration may cause water contamination.
Daniel J. Graeber

Gulf of Mexico, U.S. shale rewarding for Anadarko

HOUSTON, Feb. 4 (UPI) -- Anadarko Petroleum, a company with headquarters in Houston, said its oil production from shale basins in the United States increased 25 percent year-on-year.

Baker Hughes: U.S. oil well count declines but efficiency improves

HOUSTON, Jan. 10 (UPI) -- Baker Hughes said Friday the number of oil wells counted inland in the United States in the fourth quarter declined but drilling efficiency improved.

Noble Energy to target Colorado basin in 2014

HOUSTON, Dec. 18 (UPI) -- Noble Energy Chief Executive Officer Charles Davidson said the bulk of his company's spending next year will target the Denver-Julesburg basin in Colorado.

Marcellus shale activity increasing, EIA says

WASHINGTON, Dec. 10 (UPI) -- The U.S. Energy Information Administration said the Marcellus shale gas area in the eastern U.S. states may account for 18 percent of total U.S. gas production.

Marcellus shale pollution concerns reviewed

HARRISBURG, Pa., Nov. 5 (UPI) -- A group of oil and gas associations working in the Marcellus shale area in Pennsylvania announced plans to study radioactivity associated with gas extraction.

U.S. oil, gas production increases tied to shale

WASHINGTON, Oct. 23 (UPI) -- Oil production from six key fields in the United States is expected to increase 1.6 percent from October to November, the Energy Department said.

U.S. natural gas demand steady for winter

WASHINGTON, Oct. 17 (UPI) -- A mild winter is expected to keep U.S. natural gas demand at a relatively stable level, the Federal Energy Regulatory Commission said in a report for winter.

N.Y. highest court to hear fracking case

ALBANY, N.Y., Aug. 30 (UPI) -- New York's top court agreed to hear arguments in two cases that challenge municipal bans on hydraulic fracturing for natural gas.

Pennsylvania shale source of economic gain

HARRISBURG, Pa., June 14 (UPI) -- The natural gas industry in Pennsylvania has generated more than $1.8 billion in tax revenue in the last seven years, the Marcellus Shale Coalition said.

Slow start to Utica shale boom

COLUMBUS, Ohio, May 17 (UPI) -- The Ohio Department of Natural Resources said natural gas production from the Utica shale play was slow but could pick up in the next few years.

W.H. Smith acquires LaBarge product lines

PARKERSBURG, W.Va., March 11 (UPI) -- W.H. Smith Co. reports it has completed acquisition of intellectual property rights and related assets made for the U.S. military by LaBarge Products Inc.

Pipe planned from Utica, Marcellus shale

HOUSTON, March 8 (UPI) -- U.S. energy company Williams and Boardwalk Pipeline Partners announced plans for a joint venture to move Midwest shale natural gas to the southern coast.

Gulfport Energy takes on more Utica shale

OKLAHOMA CITY, Feb. 12 (UPI) -- More than 21,000 barrels of oil equivalent per day are expected to come from the Utica shale play in Ohio given new acreage, said Gulfport Energy Corp.

New York debates natural gas rules

ALBANY, N.Y., Feb. 6 (UPI) -- Concerns about the extraction of shale natural gas in New York state suggests the government may miss a regulations deadline, a commissioner said.
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The Marcellus Formation (also classified as the Marcellus Subgroup of the Hamilton Group, Marcellus Member of the Romney Formation, or simply the Marcellus Shale) is a unit of marine sedimentary rock found in eastern North America. Named for a distinctive outcrop near the village of Marcellus, New York in the United States, it extends throughout much of the Appalachian Basin. The shale contains largely untapped natural gas reserves, and its proximity to the high-demand markets along the East Coast of the United States makes it an attractive target for energy development.

Stratigraphically, the Marcellus is the lowest unit of the Devonian age Hamilton Group, and is divided into several sub-units. Although black shale is the dominant lithology, it also contains lighter shales and interbedded limestone layers due to sea level variation during its deposition almost 400 million years ago. The black shale was deposited in relatively deep water devoid of oxygen, and is only sparsely fossiliferous. Most fossils are contained in the limestone members, and the fossil record in these layers provides important paleontologal insights on faunal turnovers. The black shales also contain iron ore that was used in the early economic development of the region, and uranium and pyrite which are environmental hazards. The fissile shales are also easily eroded, presenting additional civil and environmental engineering challenges.

The Marcellus Formation is a black shale that may contain limestone beds and concentrations of iron pyrite (FeS2) and siderite (FeCO3). Its sedimentary structure, or bedding, is moderately well developed. Like most shales, it tends to split easily along the bedding plane, a property known as fissility. Lighter colored shales in the upper portion of the formation tend to split into small thin-edged fragments after exposure. These fragments may have rust stains from exposure of pyrite to air, and tiny gypsum (CaSO4·2H2O) crystals from the reaction between pyrite and limestone particles. Fresh exposures of the pyriteiferous shale may develop the secondary mineralization of orange limonite (FeO(OH)·nH2O), and the pale yellow efflorescence or bloom of sulfur, associated with acid rock drainage.

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Marcellus Shale."
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