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Oxygen Activation Measurement
A schematic showing the oxygen-activation measurement is illustrated in Figure 1.
The neutron generator emits a burst of neutrons which causes oxygen (present in water molecules) in the borehole to become activated. If the water is moving up past the tool, a population of activated water is formed. This activated water has a half-life of about seven seconds, and as the oxygen atoms return to their normal state, gamma rays are emitted. These gamma rays are counted by the detectors and are shown as an increase in the background counts. Oxygen activation has particular application in production logging, where it is used to identify water flow in wellbores or behind casing strings. Tools such as Western Atlas’ Hydrolog or Schlumberger’s Water Flow Log (WFL) are used for this purpose.
