Geoelectrical Measurements
Geoelectrical measurements obtain earth electrical condictivitY which gives information on subsurface structure. This method is suitable for horizontal-layering structure and is used as depth probe down to about 3000 meter. Interpretation of field data is done either directly or indirectly. The indirect method, based on curve matching, is used especially as a preliminary interpretation because it can be done relatively fast. A graphical plot between apparent resistivities and half current electrode distances is made from field data. Several field measurements have been made using the 4 - electrode configuration, either Schlumberger or Wenner. Amm H. Nazif