Utica Shale | |
---|---|
Stratigraphic range: | |
Type | Geological formation |
Underlies | Lorraine Shale, Martinsburg Formation, and Reedsville Formation |
Overlies | Point Pleasant Formation, Trenton Group Canajoharie shale |
Thickness | up to 1,000 feet (300 m) [1] |
Lithology | |
Primary | Shale |
Location | |
Coordinates | 43°03′50″N75°10′48″W / 43.064°N 75.18°W |
Region | Appalachian Basin |
Country | Canada United States |
Type section | |
Named for | Utica, New York |
Named by | Ebenezer Emmons, 1842 |
The Utica Shale is a stratigraphical unit of Upper Ordovician age in the Appalachian Basin. It underlies much of the northeastern United States and adjacent parts of Canada.
It takes the name from the city of Utica, New York, as it was first described as an outcrop along the Starch Factory Creek east of the city by Ebenezer Emmons in 1842. [2]
The Utica Shale is composed of calcareous, organic, and rich shale. [3]
The Utica shale is a major source of unconventional tight gas in Quebec, and is rapidly becoming so in Ohio.
Drilling and producing from the Utica Shale began in 2006 in Quebec, focusing on an area south of the St. Lawrence River between Montreal and Quebec City. Interest has grown in the region since Denver-based Forest Oil Corp. announced a significant discovery there after testing two vertical wells. Forest Oil said its Quebec assets may hold as much as four trillion cubic feet of gas reserves, [4] and that the Utica shale has similar rock properties to the Barnett Shale in Texas.
Forest Oil, which has several junior partners in the region, has drilled both vertical and horizontal wells. Calgary-based Talisman Energy has drilled five vertical Utica wells, and began drilling two horizontal Utica wells in late 2009 with its partner Questerre Energy, which holds under lease more than 1 million gross acres of land in the region[ citation needed ]. Other companies in the play are Quebec-based Gastem and Calgary-based Canbriam Energy.
The Utica Shale in Quebec potentially holds 4×10 12 cu ft (110×10 9 m3) at production rates of 1×10 6 cu ft (28,000 m3) per day. [5] [6] From 2006 through 2009 24 wells, both vertical and horizontal, were drilled to test the Utica. Positive gas flow test results were reported, although none of the wells were producing at the end of 2009. [7] Gastem, one of the Utica shale producers, took its Utica Shale expertise to drill across the border in New York state. [8]
The province of Quebec imposed a moratorium on hydraulic fracturing in March 2012. [9]
Utica Shale drilling and production began in Ohio in 2011. Ohio as of 2013 is becoming a major natural gas and oil producer from the Utica Shale in the eastern part of the state. [10] Map of Ohio Utica Shale drilling permits and activity by date. [11] [12] In 2011 drilling and permits for drilling in the Utica Shale in Ohio reached record highs. [13]
Companies like CNX Resources have had success expanding Utica Shale production in Pennsylvania, drilling its first Utica well in 2015 in Westmoreland County. [14] In 2022, CNX formed a partnership with the Pittsburgh International Airport in Allegheny County to develop Utica shale on airport property and convert it to LNG and CNG for use in fueling aviation and other machinery. [15]
In 2009, the Canadian company Gastem, which had been drilling gas wells into the Utica Shale in Quebec, drilled the first of its three state-permitted Utica Shale wells in New York. The first well drilled was in Otsego County. [16]
New York imposed a moratorium on large-volume hydraulic fracturing in 2008. [17] This was renewed by Governor Andrew Cuomo in 2014, and continues as of December 2017. [18]
The US Energy Information Administration estimated in 2012 that the Utica Shale in the US held 15.7 trillion cubic feet of unproved, technically recoverable gas. The average well was estimated to produce 1.13 billion cubic feet of gas. [19] The same year, the US Geological Survey estimated that the Utica Shale had 38.2 trillion cubic feet of undiscovered technically recoverable gas, 940 million barrels of oil, and 208 million barrels of natural gas liquids. [20]
In 2022, a team of researchers in a paper published in Energy Policy identified the Utica Shale as a "carbon bomb," a fossil fuel project that would result in more than one gigaton of carbon dioxide emissions if fully extracted and burnt. [21]
The Utica Shale lies under most of New York, Pennsylvania, Ohio, and West Virginia, and extends under adjacent parts of Ontario and Quebec in Canada and Kentucky, Maryland, Tennessee, and Virginia in the United States.
It occurs in outcrops in the state of New York [1] and in the subsurface in the provinces of Quebec and Ontario. [3]
Parts of the Utica shale underlie the Island of Montreal, and its weakness relative to the Trenton and Chazy limestones under much of the rest of the island complicated the construction of the Montreal metro. Some stations had to be built cut-and-cover or with a narrow split platform profile to reduce the load on the bedrock. In particular, De l'Église station suffered a cave-in during construction and had to be hastily replanned.
In some regions of Pennsylvania, the Utica Shale reaches to almost two miles below sea level. However, the depth of the Utica Shale rock decreases to the west into Ohio and to the northwest towards Canada. [22]
It reaches a thickness of up to 1,000 feet (300 m) [1] and can be as thin as 70 feet (20 m) towards the margins of the basin. 250 feet (80 m) are exposed in the type section.
The Utica Shale underlies the Lorraine Group and overlies the Trenton Group limestone and the Canajoharie shale in the Mohawk River valley.
The Utica Shale is divided into the Nowadaga Zone, Loyal Creek Zone and Holland Patent Zone. [1]
It lies a few thousand feet under the Marcellus Shale.
The Barnett Shale is a geological formation located in the Bend Arch-Fort Worth Basin. It consists of sedimentary rocks dating from the Mississippian period in Texas. The formation underlies the city of Fort Worth and underlies 5,000 mi2 (13,000 km2) and at least 17 counties.
Fracking in the United States began in 1949. According to the Department of Energy (DOE), by 2013 at least two million oil and gas wells in the US had been hydraulically fractured, and that of new wells being drilled, up to 95% are hydraulically fractured. The output from these wells makes up 43% of the oil production and 67% of the natural gas production in the United States. Environmental safety and health concerns about hydraulic fracturing emerged in the 1980s, and are still being debated at the state and federal levels.
Shale gas is an unconventional natural gas that is found trapped within shale formations. Since the 1990s a combination of horizontal drilling and hydraulic fracturing has made large volumes of shale gas more economical to produce, and some analysts expect that shale gas will greatly expand worldwide energy supply.
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The Haynesville Shale is an informal, popular name for a Jurassic Period rock formation that underlies large parts of southwestern Arkansas, northwest Louisiana, and East Texas. It lies at depths of 10,500 to 13,000 feet below the land’s surface. It is part of a large rock formation which is known by geologists as the Haynesville Formation. The Haynesville Shale underlies an area of about 9,000 square miles and averages about 200 to 300 feet thick. The Haynesville Shale is overlain by sandstone of the Cotton Valley Group and underlain by limestone of the Smackover Formation.
Shale gas in the United States is an available source of unconventional natural gas. Led by new applications of hydraulic fracturing technology and horizontal drilling, development of new sources of shale gas has offset declines in production from conventional gas reservoirs, and has led to major increases in reserves of U.S. natural gas. Largely due to shale gas discoveries, estimated reserves of natural gas in the United States in 2008 were 35% higher than in 2006.
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Fracking is a well stimulation technique involving the fracturing of formations in bedrock by a pressurized liquid. The process involves the high-pressure injection of "fracking fluid" into a wellbore to create cracks in the deep-rock formations through which natural gas, petroleum, and brine will flow more freely. When the hydraulic pressure is removed from the well, small grains of hydraulic fracturing proppants hold the fractures open.
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