Acoustic wave velocity behavior for some Jurassic carbonate samples, north Sinai, Egypt

• P-wave and S-wave at dry and fully saturated increased with increasing bulk density.
• The relationships between permeability and velocities could not be identified.
• The statistical analysis indicates that the P-wave is higher in the fully saturated.
• The S-wave of fully saturated is a fair correlated with the S-wave of dry samples.
• Porosity and S-wave for dry and fully saturated are a cloud of points.

Seismic data of reservoir rocks use for understand of risk reduction. Acoustic laboratory measurements have been carried out for 75 carbonate rock samples for both dry and fully saturated collected from Jurassic deposits exposed in the north Sinai at Gebel El-Maghara. This study has been carried out to know more about the behavior of compression wave velocity and shear wave velocity in carbonate rock samples for both dry and fully saturated conditions and to investigate the effect of porosity, permeability and density on both dry and fully saturated acoustic velocities. The compressional wave velocities at dry and fully saturated carbonate rock samples increased with increasing the bulk density and decreasing the porosity, while the porosity decreasing with increasing bulk density, the relationships between the porosity as well as shear wave velocity in dry and fully saturated are in cloud points, with no clear relationships. The relationships between the permeability and both the compressional wave and the shear wave velocities at dry and fully saturated cases could not be identified. The statistical analyses indicate that the compressional wave in the fully saturated is higher than the compressional wave in dry case. The compressional wave velocity of the fully saturated carbonate rock samples were strongly correlated with the compressional wave velocity of the dry rock samples and the derived equation can be used for prediction of the compressional wave velocity of fully saturated rock from the compressional wave velocity of dry rock. The shear wave of the fully saturated carbonate rock samples is a fair correlated with the shear wave of the dry rock samples.