Vp to Vs

Gassman 1 (Anhydrite, Basalt, Chalk, Claystone, Coal, Halite, Marl, Mudstone, Siltstone)

Assuming a constant Poisson’s ratio,

Root 3 is a non-dimensional constant.

V_P in km/s

In terms of the travel times used in the software,

DTS in μs/ft

Root 3 is a non-dimensional constant.

Gassman 2  (Anhydrite, Basalt, Chalk, Claystone, Coal, Halite, Marl, Mudstone, Siltstone)

For cases where Poisson’s ratio (n) varies,

1 is a non-dimensional constant.

2 is a non-dimensional constant.

V_P in km/sec

Dolomite-Castagna (Dolomite, Shale)

0.578 is a non-dimensional constant.

V_P in km/sec

0.078 in km/sec

Limestone-Castagna (Limestone)

-0.055 in km/sec

1.017 is a non-dimensional constant.

1.03 in km/sec

SST (Sandstone)

SST-Castagna (Sandstone)

V_P in km/s

0.856 in km/s

SST-Vernik (Sandstone)

V_P in km/s

SST-Williams (Sandstone)

0.00422 in km/s

304.8 is a non-dimensional constant.

1.182 is a non-dimensional constant.