Characterization of Fractured Reservoirs Using a Combination of Downhole Pressure and Self-Potential Transient Data

Figure 5

Plan view of experimental setup of pressure and SP measurements at the Kamaishi Mine in April–June 2007. Ag-AgCl electrodes No. 1 to 12 and No. 13 to 24 were installed in wells KF-1 and KF-3, respectively. Ag-AgCl electrodes were also installed on the tunnel floor at eight points No. 25 to 32 and at the reference point. Locations of the borehole electrodes near permeable fractures which showed distinguishable behaviors from those of other electrodes are shown by solid asterisks. Locations of tunnel floor electrodes which showed SP changes corresponding to the flow from KF-1 or KF-3 are shown by open asterisks. Locations of other electrodes are shown by solid or open circles (open circles show the locations of electrodes which were sometimes unstable during the period from April to June 2007).