saturation

Saturation Calculations

Saturation Calculations

pypetrophysics.saturation.formation_factor(arch_a, phi, arch_m)

Computes Archie Formation Factor (F)

Parameters:
  • arch_a (float) – Archie Tortuosity Factor - a
  • phi ([type]) – Porosity (decimal)
  • arch_m (float) – Archie Cementation Exponent - m
Returns:

Returns Archie Formation Factor
Return type:

float
pypetrophysics.saturation.resistivity_index(rt, ro)

Archie Resistivity Index (I)

Parameters:
  • rt (float) – True formation resistivity (ohm.m)
  • ro (float) – Resistivity of water saturated formation (ohm.m)
Returns:

Returns Archie resistivity index (I)
Return type:

float
pypetrophysics.saturation.ro(formation_factor, rw)

Archie Ro - Resistivity of water saturation formation (ohm.m)

Parameters:
  • formation_factor (float) – Archie Formation Factor
  • rw (float) – Resistivity of formation water (ohm.m)
Returns:

Returns resistivity of water saturation formation (ohm.m)
Return type:

float
pypetrophysics.saturation.sw_archie(phi, rw, rt, arch_a, arch_m, arch_n, limit_result=False, low_limit=0, high_limit=1)

Archie Water Saturation

Parameters:
  • phi (float) – Porosity (decimal)
  • rw (float) – Water resistivity
  • rt (float) – True formation resistivity
  • arch_a (float) – Archie Tortuosity Factor (a)
  • arch_m (float) – Archie Cementation Exponent (m)
  • arch_n (float) – Archie Saturation Exponent (n)
  • limit_result (bool, optional) – Apply limits to the result value. By default False
  • low_limit (int, optional) – Low limit. If value falls below this limit it will be set to this value. By default 0
  • high_limit (float, optional) – High limit. If value falls above this limit it will be set to this value. By default: 1
Returns:

Returns water saturation computed using the Archie equation in decimal units.
Return type:

float