Applications
- Depth Matching between cased-hole and open-hole logs
- Pick up radioactive anomalies caused by saline water invasion
- Pick up radioactive anomalies caused by water invasion or radioactive tracers
Sample Logs
Tool Schematic
Mathematical Model
GR = (1-\phi_e) \cdot GR_{m} + \phi_e \cdot (s_w \cdot GR_w + s_o \cdot GR_o) |
GR_m = \sum_i GR_{mi} \cdot V_{mi}/V |
where
| effective porosity | |
| natural gamma radioactivity of formation water | |
| natural gamma radioactivity of formation oil | |
| natural gamma radioactivity of rocks | |
| natural gamma radioactivity of i-th mineral | |
| volume share occupied by i-th mineral | |
| water saturation | |
| oil saturation |
Typical values
See also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics / Reservoir Data Logs (RDL) @model / Lithology Log Interpretation @model