Kartenstapel

A) poorly sorted sedimentary deposit with high porosity

B) well sorted sedimentary deposit having low porosity

C) poorly sorted sedimentary deposit consisting of pebbles that are themselves porous

D) very well sorted sedimentary porosity with very low porosity

E) rock made porous by dissolution

F) fractured rock

Representative Elementary Volume: A portion of space occupied by a number of phases, a least one of which is a solid.

—> correlated to continuum approach

(from microscopic level to macroscopic level: for example velocity at one point to average velocity in REV)

Aquifer:

• contains full saturation

• permits water to move through it

Aquiclude:

• may contain water

• is incapable of transmitting

Aquifer: range 0-1000m depth

Reservoir: depth larger thn 1000m

—> for Darcys law Re must not exceed value between 1 and 10

with

• roh * g = specific weight

• my = viscosity

• k: (given in darcy 1 darcy = 9,87 x 10-9 cm^2)

with

• C = constant

• d = grain diameter

• one dimensional flow

• homogenous isotropic porous medium

• constant density fluid

• non-deformable solid matrix

• flow at low Reynolds numbers

• saturated flow

Darcy’s law is simplified form.

Averaged momentum balance equation can be generalized to:

• Three-dimensional flow

• Anisotropic porous media

• Inhomogeneous porous media

• Fluids of variable density

• Unsaturated flow

always possible to choose three muttual orthogonal direction that this is valid:

principle of mass conservation

with all our assumptions

volume of water released by a unit volume of porous media for a unit pressure change

• wetting phase —> water

• non-wetting phase —> air (gas)

molecules of the