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Open-File Report 2008–1123


Flow-Log Analysis for Hydraulic Characterization of Selected Test Wells at the Indian Point Energy Center, Buchanan, New York

By John H. Williams

The report is available Online Only.

Prepared in cooperation with the
United States Nuclear Regulatory Commission


Flow logs from 24 test wells were analyzed as part of the hydraulic characterization of the metamorphosed and fractured carbonate bedrock at the Indian Point Energy Center in Buchanan, New York. The flow logs were analyzed along with caliper, optical- and acoustic-televiewer, and fluid-resistivity and temperature logs to determine the character and distribution of fracture-flow zones and estimate their transmissivities and hydraulic heads. Many flow zones were associated with subhorizontal to shallow-dipping fractured zones, southeast-dipping bedding fractures, northwest-dipping orthogonal fractures, or combinations of bedding and orthogonal fractures. Flow-log analysis generally provided reasonable first-order estimates of flow-zone transmissivity and head differences compared with the results of conventional hydraulic-test analysis and measurements. Selected results of an aquifer test and a tracer test provided corroborating information in support of the flow-log analysis.

Suggested citation:

Williams, J.H., 2008, Flow-log analysis for hydraulic characterization of selected test wells at the Indian Point Energy Center, Buchanan, New York: U.S. Geological Survey Open-File Report 2008–1123, 30 p., online only.

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