Total density of the rock and saturating fluids:

\rho_b = \frac{m_t}{V_t}

where – total mass of rock element, – total volume occupied by the rock element .

The bulk density is measured in .

\rho_B = \phi_e \, \rho_f + V_{sh} \rho_{sh} + V_m \rho_m = \phi_e \, \rho_f + V_{sh} \rho_{sh} + (1 - \phi_e - V_{sh})  \rho_m

\rho_f = s_{xo} \rho_{mf} + (1-s_{xo}) ( s_w \rho_w + s_o \rho_o + s_g \rho_g )

\rho_m = \sum_i V_{mi} \rho_{mi}

See also