Estimation of the Relative Permeability Distribution in Fractured Granitic Rocks by Means of Vertical Flow Measurements in the Siblingen Borehole, Switzerland

摘要

The report describes a technique for estimating the in situ vertical distribution of fracture permeability that appears to have important applications in radioactive-waste-disposal research. The technique uses high-resolution, vertical-flow profiling during pumping or injection to characterize the vertical distribution of permeability along the borehole. In several previous studies the technique has provided information that qualitatively agree with results from other permeability measurements, including packer tests and cross-hole pumping. The Siblingen-borehole experiment provides an opportunity to evaluate the results of permeability profiling using a high-resolution flowmeter with the results of other permeability measurements. The vertical-flow profile given for the Siblingen borehole in the report is presented in a form suitable for comparison with the results of these other measurements after they have been made, or when the results of experiments already performed at the site of the Siblingen borehole have been interpreted and published.