Definition - What does Utica Shale mean?
The Utica Shale is the stratigraphical unit of the Middle Ordovician age in the Appalachian Basin. It is black, organic rich, calcareous shale of the Middle Ordovician age. It underlies significant areas of Pennsylvania, New York, Ohio, West Virginia, Quebec and some other parts of eastern North America. It is located thousands of feet under the Marcellus Shale. It is estimated that it has natural gas deposits that range from at least 2 trillion cubic feet to 60 to 70 trillion cubic feet.
Petropedia explains Utica Shale
Utica Shale is receiving a lot of attention because of its large amount of natural gas, crude oil and natural-gas-liquid yielding to the wells drilled in Pennsylvania and Ohio. It is estimated that Utica Shale consists of 208 million barrels of natural gas liquids, 38 trillion cubic feet of natural gas and 940 million barrels of oil.
Utica Shale is considered to be the source rock of natural gas or oil by geologists. The oil and natural gas have migrated upwards, i.e., they are produced from the reservoirs in the overlying rock units.