Carbonates are characterized by a complex pore structure which
controls compressional and shear wave velocity (Scotellaro and
Mavko, 2008). An additional influencing factor observed was the shear
weakening effect for saturated samples. This could have an impact on
the geo-mechanical behaviour in the reservoir (Sharma et al., 2011).
Therefore laboratory measurements are important for the exploration
and rock property modelling of carbonate reservoirs (Gomez et al.,
2007). Rogen et al. (2005) presented the results of laboratory measurements
of chalk samples and stated that porosity was the main
controlling factor for vp and vs. Sharma et al. (2006) agreed with this
statement and mentioned as additional influencing factors: pore type,
pore fluid compressibility and variations in shear modulus. The shear
modulus weakening effect in saturated samples was also presented by