Redo reformat to remove header and avoid DOS chars 
  awk -f reformat.awk petrel_grid.dat > points.dat

Check the data file
  awk -f check.awk petrel_grid.dat 

  Results:
   Total:  117450 
   Min Value =  9.000000
   Max Value =  9.000000


Read points.dat into avs and gmv format files
View points and check outx3dgen for reasonable values.
  lagrit < points.lgi
  cp outx3dgen points.out

  Results:


   ATTRIBUTE    MIN               MAX         DIFFERENCE        LENGTH  
   xic     4.201000000E+05  4.299000000E+05   9.800000000E+03   117450  
   yic     4.307100000E+06  4.316900000E+06   9.800000000E+03   117450  
   zic    -2.208199951E+03  1.081999969E+02   2.316399948E+03   117450  

   xval    1.000000000E+00  9.000000000E+00   8.000000000E+00   117450
   nlayer  1                47                46                117450


Subset the points to area of interest.
View to makes sure flat top and bottom are reasonable
Check that imat and xval (material) values are reasonable 
Flat top and flat bottom are max mat +1 and +2
  lagrit < subset.lgi
  cp outx3dgen subset.lgi

lagrit < connect.lgi
  cp outx3dgen connect.out
  cp logx3dgen connect.log

lagrit < write_fehm.lgi
  cp outx3dgen write_fehm.out
  cp logx3dgen write_fehm.log