The void volume within a porous medium. Porosity is its fraction of bulk volume; saturation specifies which fluids occupy that void volume.
A liquid or gas occupying connected or isolated pore space. Its pressure and compressibility affect the mechanical and seismic response of porous rock.
The pressure of fluid in pore space. On fluid-accessible contacts, it reduces effective compression and can promote frictional sliding or tensile opening at fixed total stress.
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