Preliminary Subsurface Correlations of the Theresa (Galway) Sandstone Formation in New York State: Implications for Exploration
David L. Copley, L. Robert Heim,
Ardent Resources, Inc.
Pittsburgh PA 15241
Given the recent natural gas discoveries in the Theresa (Bockhahn, Northwood’s, Cascade Brook, Gas Fields) and the pervasive shows in wells penetrating this horizon it is important to begin to understand the regional distribution of reservoir quality rocks within the subsurface Theresa (Galway) and the implications for future exploration.
Larry Rickard in his 1973 Publication, Stratigraphy and Structure of the Subsurface Cambrian and Ordovician Carbonates in New York gave some indication of the hydrocarbon potential of the Theresa (Galway). Under Economic Aspects he noted that the "pre-(Knox) unconformity sandstone at the top of the Galway-Gatesburg (is) reported to be poorly cemented in some wells" with the obvious implication that friable sand translates into good reservoir.
He also did a yeoman’s job of correlating electrical logs across the state and giving us a framework for understanding subsurface stratigraphy of the Cambro-Ordovician in New York; and he did so in 1973, at a time when far fewer wells penetrated the so called "deep section".
That was yesterday, today there are about 925 wells that have penetrated the Trenton or deeper formations in New York with a wealth of attendant log information from which to (literally) draw correlations and conclusions.
The paper emphasizes the Theresa (Galway), and particularly the upper sandy section for its natural gas potential but intervals below this maybe equally prospective.
AAPG Search and Discovery Article #90059©2006 AAPG Eastern Section Meeting, Buffalo, New York