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porosity log

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Reband Hawlery
Reband Hawlery

Porosity can be measured using sonic and density logs. Sonic logs measure the interval transit time of a sound wave through rock, with denser rock having faster transit times and more porous rock having slower times. There are two methods to calculate porosity from sonic logs: using an equation involving transit time and mud/rock properties, or using a sonic porosity chart. Similarly for density logs, porosity can be calculated from an equation using bulk and grain densities of the formation and mud, or looked up on a density porosity chart. Together, sonic and density logs provide good indications of porosity when used in combination.

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Porosity logging Department of petroleum engineering Soran university Present by : Reband azad raza
Porosity Logs Sonic log Density Log None of this Logs can directly measures porosity Combination of these tools ,will give good indication for porosity
A log that measures interval transit time (t) of a compressional sound wave travelling through the formation Sonic log Dense rock faster travel time Porous rock slower travel time
How would you find a porosity from sonic curve diagram ?!
There is two method to measure porosity from sonic Log : 1- Equation 2-Sonic porosity chart 1- 2-
1-Porosity By equation method sonic tool First step indicate a wanted depth porosity
Apply this equation : From Curve c Fresh water mud in well =189/ salt water mud= 185/ Equation method
dolomite 43.5/ c salt water mud= 185/ 79 /≠＄ = So, = 7943.5 18543.5 = 0.3 Dolomite from chart
Chart sonic log - porosity
Density log The density logging tool is made up of: - a radioactive source of either Cs-137 or Co-60 The gamma rays enter the surrounding rocks where some are absorbed. It has 2 detectors Long range Short range
There is two method to measure porosity from density Log: 1- Equation 2-density porosity chart
Apply this equation : Equation method PeMaterial 2.648Sand 3.76Shale 2.71Limestone 2.876Dolomite 2.032Salt 2.977Anhydrite From curve Fresh water mud in well =1.0/3 salt water mud= 1.1/3
dolomite2.876 /3 salt water mud= 1.1/3 So, = 2.8762.6 2.8761.1 = 0.155
Chart density log - porosity
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porosity log

  • 1. Porosity logging Department of petroleum engineering Soran university Present by : Reband azad raza
  • 2. Porosity Logs Sonic log Density Log None of this Logs can directly measures porosity Combination of these tools ,will give good indication for porosity
  • 3. A log that measures interval transit time (t) of a compressional sound wave travelling through the formation Sonic log Dense rock faster travel time Porous rock slower travel time
  • 4. How would you find a porosity from sonic curve diagram ?!
  • 5. There is two method to measure porosity from sonic Log : 1- Equation 2-Sonic porosity chart 1- 2-
  • 6. 1-Porosity By equation method sonic tool First step indicate a wanted depth porosity
  • 7. Apply this equation : From Curve c Fresh water mud in well =189/ salt water mud= 185/ Equation method
  • 8. dolomite 43.5/ c salt water mud= 185/ 79 /≠＄ = So, = 7943.5 18543.5 = 0.3 Dolomite from chart
  • 9. Chart sonic log - porosity
  • 10. Density log The density logging tool is made up of: - a radioactive source of either Cs-137 or Co-60 The gamma rays enter the surrounding rocks where some are absorbed. It has 2 detectors Long range Short range
  • 11. There is two method to measure porosity from density Log: 1- Equation 2-density porosity chart
  • 12. Apply this equation : Equation method PeMaterial 2.648Sand 3.76Shale 2.71Limestone 2.876Dolomite 2.032Salt 2.977Anhydrite From curve Fresh water mud in well =1.0/3 salt water mud= 1.1/3
  • 13. dolomite2.876 /3 salt water mud= 1.1/3 So, = 2.8762.6 2.8761.1 = 0.155
  • 14. Chart density log - porosity