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Northeastern Section–41st Annual Meeting (20–22 March 2006)

Paper No. 16
Presentation Time: 8:00 AM-12:00 PM

CHARACTERISTICS OF THE BRADLEY BROOK FIELD; THE EASTERN-MOST ECONOMICALLY PRODUCTIVE GAS FIELD IN THE APPALACHIAN BASIN IN NEW YORK STATE


AHMED, Khurrum1, LOEWENSTEIN, Stuart2 and JACOBI, Robert1, (1)Geology Department, University at Buffalo, UB Rock Fracture Group, 876 NSC, Buffalo, NY 14260-3050, (2)Quest Energy, 1404 Sweet Home Rd, Suite 3, Amherst, NY 14228, khurruma@buffalo.edu

Bradley Brook Field is located in Madison County, New York State, and produces gas from the Upper Ordovician Oneida and Lower Silurian Oswego sandstones. This study integrates 47 well logs, proprietary seismic data, 27 sidewall cores, and numerous cross-plots to determine the structural, sedimentological and stratigraphic characteristics of the field.

Both seismic data and well log cross-sections demonstrate that the contact between the Oswego and Oneida sandstones is an angular unconformity; furthermore, both data sets show that the unconformity surface dips gently to the west. Bradley Brook Field occurs on a gentle anticline, as revealed by both seismic data and log cross-sections. Individual stratigraphic units are correlated across well logs on all six cross-sections we constructed. Anomalous thickness variations in the Silurian sedimentary section observed in well logs suggest either syndepositional faulting in Silurian times or, less likely, a repeated section from local thrusting.

Neutron-density cross-plots indicate the presence of gas in both Oneida and Oswego sandstones. Inspection of the cross-plots reveals that Oswego has higher porosity whereas densities for Oneida and Oswego sandstones are very similar. Water saturations in the Oswego sandstones were found to be higher than in the Oneida sandstone. The mean sidewall core porosities for Oneida and Oswego sandstones are lower than mean porosities calculated from well logs, but the range of values is similar. Thin sections from the sidewall cores show that both Oneida and Oswego sandstones are fine-grained with Oswego being more clay-rich. Illite and chlorite make up the clays in both sandstones.

Characterization of Bradley Brook Field will help in identifying possible directions to be taken in order to extend this play. This study will also help to identify and serve as a model for traps of similar nature on the eastern flanks of the Appalachian Basin.

Session No. 24--Booth# 16

Sedimentology, Stratigraphy, and Paleontology (Posters)
Tuesday, 21 March 2006: 8:00 AM-12:00 PM
Geological Society of America Abstracts with Programs. Vol. 38, No. 2, p.66
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