Sonic Log Porosity
INPUTS Common travel times (micro-sec/ft)
Sandstone: 55.6
Limestone: 47.5
Dolomite: 43.5
Drilling mud: 189
(X3.28 for micro-sec/m)
Depth =
Zone travel time =
Matrix travel time =
Fluid travel time =
Shale travel time =
Gamma-ray in clean zone =
Gamma-ray in shale =
Gamma-ray in zone of interest =
RESULTS Gamma-ray index =
Volume% of shale =
%Sonic log porosity =


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.