The Marcellus was the Opening Act
A rock layer below the
Marcellus Shale could prove to be another incredible source of natural gas.
The Marcellus Shale captured public attention when leasing and drilling activities began pumping billions of dollars into local economies and citizens began debating the environmental, social and economic impacts. All of this began suddenly in 2004 when Range Resources Corporation drilled the first Marcellus well using modern drilling technology.
Now, just a few years later, the Marcellus Shale is being developed into one of the world's largest natural gas fields. However, what we are seeing today from the Marcellus is only the first step in a sequence of natural gas plays. The second step is starting in the Utica Shale.
What is the Utica Shale?
The
Utica Shale is a rock unit located a few thousand feet below the
Marcellus Shale. It also has the potential to become an enormous natural gas resource. The Utica Shale is thicker than the Marcellus, it is more geographically extensive and it has already proven its ability to support commercial production.
It is impossible to say at this time how large the Utica Shale resource might be because it has not been thoroughly evaluated and little public information is available about its organic content, the thickness of organic-rich intervals and how it will respond to
horizontal drilling and
hydraulic fracturing. However, the results of early testing indicate that the Utica Shale will be a very significant resource.
Where is the Utica Shale?
The potential source rock portion of the Utica Shale is extensive. In the United States it underlies portions of Kentucky, Maryland, New York, Ohio, Pennsylvania, Tennessee, West Virginia and Virginia. It is also present beneath parts of Lake Ontario, Lake Erie and part of Ontario, Canada. This geographic extent of potential Utica Shale source rock is shown on the map labeled as Figure 1 in the right column of this page. If the Utica is commercial throughout this extent it will be geographically larger than any natural gas field known today.
How Deep is the Utica Shale?
Learn About
Mineral Rights The Utica Shale is much deeper than the Marcellus. The Utica Shale elevation map shown as Figure 2 in the right column of this page has contour lines that show the elevation of the base of the Utica Shale in feet below sea level. In some parts of Pennsylvania the Utica Shale can be over two miles below sea level. However, the depth of the Utica Shale decreases to the west into Ohio and to the northwest under the Great Lakes and into Canada. In these areas the Utica Shale rises to less than 2000 feet below sea level. Beyond the potential source rock areas the Utica Shale rises to Earth's surface and can be seen in outcrop. An outcrop photo of the Utica Shale near the town of Donnaconna, Quebec, Canada is show in the right column of this page as Figure 3.
Most of the major rock units in the Appalachian Basin are thickest in the east and thin towards the west. The rock units that occur between the Marcellus Shale and the Utica Shale follow this trend. In central Pennsylvania, the Utica can be up to 7000 feet below the Marcellus Shale but that depth difference decreases to the west. In eastern Ohio the Utica can be less than 3000 feet below the Marcellus.
These depth relationships of the Utica Shale and the Marcellus Shale are shown in the generalized cross sections shown below as Figure 4a and Figure 4b.
Figure 4a: The cross-section above shows the subsurface position of the Marcellus Shale, Utica Shale and the continental basement rock. The line of cross section is shown as line A-B on the inset map. Note that the Utica Shale is about 2000 feet below the Marcellus under eastern Ohio but about 6000 feet below the Marcellus in southcentral Pennsylvania. Also note that the Marcellus Shale potential source rock does not extend as far into Ohio as the Utica.
This cross-section was compiled by Geology.com using data provided by the Energy Information Administration [1], the United States Geological Survey [2], the Pennsylvania Geological Survey [3], and the U.S. Department of Energy [4].
Figure 4b: The cross-section above shows the subsurface position of the Marcellus Shale, Utica Shale and the continental basement rock. The line of cross section is shown as line A-B on the inset map. Note that the Utica Shale is about 1800 feet below the Marcellus under western New York but about 5000 feet below the Marcellus in southcentral Pennsylvania. Also note that the Marcellus Shale potential source rock does not extend as far into New York as the Utica.
This cross-section was compiled by Geology.com using data provided by the Energy Information Administration [1], the United States Geological Survey [2], the Pennsylvania Geological Survey [3], and the U.S. Department of Energy [4].
Current Development of the Utica Shale Gas Play
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In early 2011, most of the
mineral rights leasing and drilling activity tied directly to the Utica Shale was in eastern Ohio and Ontario, Canada. In these areas the Utica Shale is less than 4000 feet below the surface and the Marcellus Shale is not present. (If the Marcellus is present it becomes the target because it is shallower, less expensive to drill and has a proven potential.)
The generalized cross-section for the Utica and Marcellus Shale shown above as Figure 4 illustrates why the Utica is being developed in some parts of the Ohio and Canada instead of the Marcellus.
Where Cross-Section 4a traverses the Pennsylvania-Ohio state boundary the Marcellus Shale is above the Utica and would be preferentially drilled because it is a shallower target. However, the productive portion of the Marcellus Shale does not extend into central Ohio - but the Utica Shale does. In those areas the Utica Shale is less than one mile below the surface and a few companies are leasing and drilling the Utica Shale for natural gas.
Utica Shale Petrology and Stratigraphy
Gas Royalty
Calculator The Utica Shale is an organic-rich calcareous black shale that was deposited about 440 to 460 million years ago during the
Late Ordovician. It overlies the Trenton Limestone and is a few thousand feet below the Marcellus Shale (see the generalized stratigraphic column shown as Figure 5 in the right column of this page).
The Utica Shale has a much higher carbonate content than the Marcellus Shale and a lower clay mineral content. This difference in mineralogy produces a very different response to hydraulic fracturing treatments. The methods used in the Marcellus do not produce as much fracturing in the Utica. However, future research might be able to significantly improve the fracturing rate. (In Texas, the
Eagle Ford Shale also has a high carbonate content. Drillers there have discovered ways to make the brittle carbonate zones fracture at a much higher rate than other gas shale rock units.)
The clastic rock units of the Appalachian Basin are generally thickest in the eastern part of their extent and thin towards the west. That generalization holds for the rock units between the Utica Shale and the Marcellus Shale. In Central Ohio the Utica Shale is less than 3000 feet below the Marcellus Shale and in central Pennsylvania the Utica Shale can be up to 7000 feet below the Marcellus (see the cross-section above labeled as Figure 4 for a visual of this concept).
Thickness of the Utica Shale
The thickness of the Utica Shale is variable. Throughout the potential source rock area it ranges in thickness from less than 100 feet to over 500 feet. Over the rock unit as a whole there is a general thinning from east to west. A thickness map of the Utica Shale is shown as Figure 5 in the right column of this page. Although thickness of a reservoir rock can be important, the organic content and presence of gas are what determines the true potential of a gas shale. Very little public information is available on the organic content of the Utica shale.
Future Development of the Utica Shale
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Two important challenges for developing the Utica Shale are its significant depth and a lack of information. In areas where the Marcellus Shale is present the Utica Shale is probably going to be a resource of the distant future. The Marcellus Shale is less expensive to develop and companies will focus on it before setting their sights on a deeper target with an uncertain payoff.
However, in areas where the Marcellus Shale has been developed the Utica will have an infrastructure advantage. Drilling pads, roadways, pipelines, gathering systems, surveying work, permit preparation data and landowner relationships might still be useful for developing the Utica Shale.
In areas beyond the Marcellus Shale the Utica has already become a primary target. Leasing and drilling are already occurring in eastern Ohio and Ontario, Canada with some wells capable of yielding commercial quantities of gas.
How Will the Utica Shale Be Drilled?
The Utica Shale is an unconventional reservoir like the Marcellus Shale. The rock unit can have significant porosity; however, the pore spaces are so small that natural gas has a difficult time flowing through them. Large amounts of gas is also adsorbed onto mineral material within the rock unit. The most likely methods to be used will be
horizontal drilling with
hydraulic fracturing.
The Utica Shale underlies parts of Lake Erie and Lake Ontario. Perhaps offshore drilling will occur there at some future date.
Video Interview: Potential of Other Gas Shale Formations in the Northeastern United States, Pennsylvania State University geologist Dr. Terry Engelder describes historical and recent drilling results for the Utica Shale.
Video by Questerre Energy that explains how
hydraulic fracturing and
horizontal drilling will be used to develop the Utica Shale in Quebec Canada.