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Downhole logging sensor measuring the natural gamma emission from surroundings rocks borehole fluid temperature


Log Name = GRTEMP


Measured property = gamma quants per secondFluid Temperature


SIOil MetricOil Field
°C°C

°F = 9/5 T [°C] + 32R/s μR/hr  = 2.8 ·10-10 R/s GAPI = 4.2* ·10-10 R/s = 1.5* μR/hr

 * – for scintillation detectors

Image RemovedImage Added


Scope of Applicability

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 

    • Mathematical Model

    LaTeX Math Block
    alignmentleft
    GR = (1-\phi_e) \cdot GR_{m}  + \phi_e \cdot s_w \cdot GR_w

    where 

    LaTeX Math Inline
    bodyGR_w
     is natural gamma radioactivity of formation water and 
    LaTeX Math Inline
    bodyGR_m
      is natural gamma radioactivity of rocks:

    LaTeX Math Block
    alignmentleft
    GR_m = \sum_i GR_{mi}
    where 
    LaTeX Math Inline
    bodyGR_{mi}
     natural gamma radioactivity of i-th mineral.



    Mathematical Model


    Mathematical model of fluid temperature is very complex and described in following papers: