THE VIRTUAL PACKER METHOD - INTERVAL-SPECIFIC DATA FROM WIRELINE LOGS IN OPEN BOREHOLES

摘要

Many site characterization studies involve heterogeneous aquifers with multiple water producing intervals providing multiple pathways for the propagation of contaminants. Specific producing zones are often sampled by isolating individual intervals with straddle packers. Such sampling is both time consuming, requiring use of expensive equipment and drill-rig mobilization, and fraught with potential difficulties such as the inability to seat packers in rough or unstable boreholes. Efficient use of straddle packers also requires knowledge of the specific intervals to be tested, and usually occurs at times different from the initial application of borehole geophysics.