NAME

       cpchop - Upscale simple statistics

SYNOPSIS

       cpchop gridfilename=cornerpointgrid.grdecl [option=value]

DESCRIPTION

       Utility  for  doing  subsampling  and  property  analysis of Eclipse grid files, typically
       generated in SBED or ReservoirStudio, but can be used on all corner point grids  with  box
       shape and vertical pillars.

       Example usage:

       cpchop gridfilename=HugeReservoirStudioGrid.grdecl subsamples=100 ilen=5 jlen=5 zlen=5

OPTIONS

       subsamples Number of subsamples. Defaults to 1.
       filebase If supplied, grdecl-files for each subsample will be written to files named using
       this filebase, it may include directory names.
       resultfile Name of a textfile to output table of results per subsample to.
       ilen Length in i-direction of subsample, specified in number of  cells.  Defaults  to  all
       cells in i-direction.
       jlen  Length  in  j-direction  of subsample, specified in number of cells. Defaults to all
       cells in j-direction.
       zlen Length in z-direction of subsample, specified in the grids length unit (typically  cm
       or  m).  Defaults  to  full  height.  imin Can be used to limit the search area for random
       subsamples. Defaults to minimum i in inputgrid (full model).  imax Can be  used  to  limit
       the search area for random subsamples. Defaults to maximum i in inputgrid (full model).
       jmin Analog to imin, but in j-direction. Defaults to minimum j in inputgrid (full model).
       jmax Analog to imax, but in j-direction. Defaults to maximum j in inputgrid (full model).
       zmin  Analog  to imin, but in z-direction and specified in the grids length unit. Defaults
       to minimum in inputgrid.
       zmax Analog to imax, but in z-direction and specified in the grids length  unit.  Defaults
       to maximum in inputgrid.
       upscale  Boolean  for  whether to do upscaling on the subsamples, either true or false. If
       the objective is to obtain a grdecl-file for the subsample, set to  false  for  run  time.
       Defaults to true.
       bc Boundary condition type for upscaling, either fixed or periodic. Defaults to fixed.
       resettoorigin  If true, outputted grdecl-file will have its ZCORN-values and COORDS-values
       shifted so that the model is defined at the origin. If false,  the  outputted  grdecl-file
       will be located in its original position. Defaults to true.
       seed Provide a seed number. Defaults to 0.
       minperm Minimum permeability. Defaults to 1e-9.
       dips  Whether to do dip averaging. Outputs dip and azimuth for each subsample. Defaults to
       false.
       azimuthdisplacement Add or subtract value for dip, assumes dips is set to  true.  Defaults
       to zero.
       satnumvolumes Count volumes per satnum/rocktype. Defaults to false.
       mincellvolume Ignore cells with volume below threshold. Defaults to 1e-9.
       endpoints Upscale saturation end-points. Defaults to false.
       cappres Upscale capillary pressure. Defaults to false.
       rock_list Provide a rock list for end-point upscaling.
       anisotropirocks Directional saturation functions. Defaults to false.

REPORTING BUGS

       Report on github repository <https://github.com/OPM/opm-upscaling/issues>

SEE ALSO

       upscale_perm