Wyllie time-average equation vs Gardner's equation vs RHG Equation for porosity

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SUMMARY

The discussion centers on the comparison of three equations for estimating porosity from seismic velocity: the Wyllie time-average equation, Gardner's equation, and the RHG equation. The RHG equation is preferred due to its improved accuracy for unconsolidated sands and brine-saturated conditions, while Gardner's equation primarily correlates density with porosity without considering velocity. Participants seek clarification on the advantages of the RHG equation over the other two and inquire about alternative methods like imbibition, ideal gas laws, and mercury displacement for porosity calculations.

PREREQUISITES
  • Understanding of seismic velocity in porous rocks
  • Familiarity with the Wyllie time-average equation
  • Knowledge of Gardner's equation
  • Awareness of the RHG equation and its applications
NEXT STEPS
  • Research the derivation and applications of the RHG equation
  • Study the limitations of the Wyllie time-average equation in various geological contexts
  • Explore alternative porosity estimation methods, including imbibition and mercury displacement
  • Examine case studies comparing the effectiveness of these equations in different rock types
USEFUL FOR

Geophysicists, petroleum engineers, and researchers involved in subsurface exploration and porosity estimation in geological formations.

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TL;DR
Wyllie time-average equation vs Gardner's equation vs RHG Equation and what these equation are different from any other approach for calculating imbition method, ideal gas laws or mercury displacement method
If you were estimating porosity from velocity, which approach would you prefer to use among Wyllie time-average equation, Gardner's equation Or RHG Equation, when and why?

My answer is RHG equation as wylllie equation don't work for unconsolidate sand and give accurate results when it is saturated with brine solution. Garnder's equation mainly relates density with porosity not accounting with velocity and RHG equation is improved one. CAn you please help me with anything i'm missing here.

Are these three equation are different from any other approach like imbition method, ideal gas laws or mercury displacement method for calculating porosity?
 
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Welcome to PF.

Would I be right in guessing that this question is about seismic velocity, in porous rocks, that are water saturated ?
 
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Baluncore said:
Welcome to PF.

Would I be right in guessing that this question is about seismic velocity, in porous rocks, that are water saturated ?
yes it is about comparing results given by three equations. It is to discuss mainley what RPG equation have advantages over wyllie and Gardner's equation and what is appropriate method among three to measure porosity from velocity in different types of rocks.
 
I am interested in the subject, but it is more than 40 years since I shot my last seismic survey.
Can you please post links to the equations.
 

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