The rock volume is split into three major components: effective pore volume , shale volume and rock martix :| LaTeX Math Block |
|---|
| anchor | Omega_R |
|---|
| alignment | left |
|---|
| \Omega_R = \Omega_e +\Omega_{sh} + \Omega_m |
The usual practice is to use relative volumes: | LaTeX Math Block |
|---|
| anchor | Omega_R |
|---|
| alignment | left |
|---|
| \phi_e = \frac{\Omega_e}{\Omega_R}, \quad V_{sh} = \frac{\Omega_{sh}}{\Omega_R}, \quad V_m = \frac{\Omega_m}{\Omega_R} |
which are measured in V/V units (or fracs) and honor the following constraint: | LaTeX Math Block |
|---|
| \phi_e +V_{sh} + V_m = 1 |
The relative effective pore volume contains free or connate fluids (water, oil , gas) and called effective porosity.It corresponds to the air porosity of the dried laboratory cores: | LaTeX Math Inline |
|---|
| body | \phi_e = V_{\rm air \, core} |
|---|
|
. | 