Early Indicators of the Utica/Point Pleasant Potential, Appalachian and Michigan Basins
The Ordovician Utica/Point Pleasant argillaceous limestone has long been known as the source rock for conventional Trenton, Black River, Copper Ridge, Rose Run, Beekmantown and Clinton/Medina plays throughout the Appalachian and Michigan basins. It has all of the correct ingredients; sufficient TOC, burial depth, porosity, permeability, seal and over-pressuring. The vast majority of the hydrocarbons produced in the “Utica” Play are actually from the Point Pleasant Formation, which is Ohio’s terminology for the shelf edge deposits surrounding Trenton Limestone platforms in New York, Ohio, West Virginia, Kentucky, Michigan, surrounding states and Canada. The Utica/Point Pleasant Play dates back to 1859 when the Michigan Basin equivalent Collingwood Shale was mined and retorted into oil in Craigleith, Ontario. This endeavor was short lived due to the simultaneous discovery of oil in Pennsylvania. In the late 1880’s Trenton gas was discovered in New York State along the shore of Lake Ontario. This highly overpressured discovery was deemed to be from the Trenton Limestone, however the Trenton here contains argillaceous carbonate source rock, similar to the Point Pleasant. John Galey drilled the deepest cable tool well in the world in 1944 in Butler County, PA, which had significant shows in the Point Pleasant interval. In more modern times several near-shelf-edge conventional Trenton fields were discovered in West Virginia, New York and Ohio. In 2009 Range Resources drilled the first horizontal Utica Point Pleasant test in the United States, located in Beaver County, PA. The well was deemed to be sub-commercial and was not turned into line. The following year Chesapeake drilled their Buell discovery well in Harrison County, Ohio, which flowed at a rate of 9.5 mmcf and 1,425 barrels per day of liquids from perfs in the horizontal section through the Point Pleasant limestone. Data from old shows and thousands of Trenton penetrations from the Ohio Knox play contributed to Chesapeake’s successful campaign to initiate the “Utica Play” in Southeastern Ohio. Chesapeake paid attention to oilfield history and existing geological data to discover one of the premier unconventional plays in the world!
AAPG Datapages/Search and Discovery Article #90373 © 2019 AAPG Eastern Section Meeting, Energy from the Heartland, Columbus, Ohio, October 12-16, 2019