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# ''MR'' (mu-rho)= this property is sensitive towards the change in lithology. Sandstones generally have higher MR compared to shales and claystones due to its higher rigidity (μ). MR is mathematically defined as follow:  

# ''MR'' (mu-rho)= this property is sensitive towards the change in lithology. Sandstones generally have higher MR compared to shales and claystones due to its higher rigidity (μ). MR is mathematically defined as follow:  

::<math>MR = (V_s * Rho)^2 = SI^2</math>

::<math>MR = (V_s * Rho)^2 = SI^2</math>

 

::as MR is strongly controlled by the shear impedance (SI) and shear modulus (μ), the magnitude of this property does not really affected by pore fluids, but rather by the lithology.  

as MR is strongly controlled by the shear impedance (SI) and shear modulus (μ), the magnitude of this property does not really affected by pore fluids, but rather by the lithology.  

[[File:GeoWikiWriteOff2021-Muamamr-Figure1.png|thumbnail|Figure 1. Well log section showing the difference of rock physics properties between clean sandstone (Sand A), clayey sandstone (Sand B), and claystone. ]]

[[File:GeoWikiWriteOff2021-Muamamr-Figure1.png|thumbnail|Figure 1. Well log section showing the difference of rock physics properties between clean sandstone (Sand A), clayey sandstone (Sand B), and claystone. ]]