Tixier Rocky Mountain Method
INPUTS
Depth =
Total depth =
Avg surface temp =
Bottomhole temp =
Mud resistivity, Rm =
Rm measuring temp =
Percentage of
formation water
left in invaded zone,
z% =
Common values:
z%=0 Porosity < 10%
z%=5 Porosity 10% - 18%
z%=7.5 Porosity 18% - 25%
z%=10 Porosity > 25%
Ri, shallow resistivity =
Rt, deep resistivity =
Rw, formation water resistivity =
Define optional
porosity model:
a =
m =
INPUT RMF?
Resistivity of mud filtrate, Rmf =
Rmf measuring temperature =
RESULTS Temperature gradient =
per 100 depth units
Formation temperature =
Corrected Rm =
Corrected Rmf =
Mixed water resistivity, Rz =
Water saturation, Sw% =
Porosity% from Archie model
(limestone: a=1, m=2) =
Porosity% from Humble model
(sandstone: a=.62, m=2.15) =
Porosity% from optional model =

Recording:



When you finish your calculations,
select the recorded data, copy it,
and then paste it into a spreadsheet
as comma-delimited values to save it.