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
| LaTeX Math Block | ||||
|---|---|---|---|---|
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GR = (1-\phi_e) \cdot GR_{m} + \phi_e \cdot (s_w \cdot GR_w + s_o \cdot GR_o) |
| LaTeX Math Block | ||||
|---|---|---|---|---|
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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
| Excerpt Include | ||||||
|---|---|---|---|---|---|---|
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See also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics / Reservoir Data Logs (RDL) @model / Lithology Log Interpretation @model