ahmilb@houu64$bhpvelutil

 BHPVELUTIL - BHP Velocity Utility                            

 BHPVELUTIL converts velocities between various formats       

 bhpvelutil < infile > outfile [optional parameters]          

 Required Parameters: none                                     

 Optional Parameters:                                          

 verbose=0      Use verbose=1 for long printout               

 infmt=segy     Format of input data (segy means SU-segy)     

 outfmt=par     Format of output data                          

 Valid values for infmt/outfmt:                               

 segy           SU SEGY format                                

 par            SU ASCII Format                                

 par3d          SU ASCII Format Modified for 3D               

                NB: par3d does not use stdout, specify parfile

 pro            ProMAX ASCII Format                           

 velf, velf1    Western ASCII Format 1                        

 velf2          Western ASCII Format 2                        

 velf3          Western ASCII Format 3                        

 veff           Vastar/Phillips/Charisma ASCII Format         

 vel3d          Shell ASCII Format                            

 lm             Landmark XYTV ASCII Format                    

 v2             Veritas V2 ASCII Format                       

 views          ADS VIEWS ASCII vtp Format                    

 fdmodel        ADS VIEWS Binary 2D FDModel Format            

                NOTE: fdmodel input/output does not use       

                stdin/stdout. Use model_in/model_out parameters

 tgs            TGS-NOPEC ASCII Format                        

 sbase2         SeisBase 2D ASCII                             

 sbase3         SeisBase 3D ASCII                             

 ntout=         Number of samples per trace in output         

                If infmt=segy default is input samples per trace

                If infmt=fdmodel, default is model samples per trace

                If infmt=[any ASCII], samples per trace is    

                whatever is in each input ASCII trace         

                For ASCII to SEGY, defaults to 1000.          

 dt=            Use for ASCII to SEGY, defaults to 0.004.     

 line=          Line name for ASCII output. If not specified, 

                and input is ASCII, get line name from input, 

                if available. Line is required when writing   

                formats velf, veff, par3d, sbase2             

 model_in=      Binary input file required if infmt=fdmodel   

 model_out=     Complete path/filename of output              

  If outfmt=par3d, parfiles are used instead of stdout.       

  Each parfile is named line_'lnum'.par3d, where 'lnum' is the

  3D line number, e.g., line_1000.par3d, line_1002.par3d, etc.

  The parfiles are written to a directory specified by pardir

  pardir=3dvels Directory name to which to write parfiles.    

  If outfmt=fdmodel, parameters nx through cdpnum             

  are required by the ADS VIEWS program                       

 nx=100         Number of velocity traces                     

 dx=50          Distance between velocity traces               

 cdpmin=1       Minimum CDP number of model                   

 cdpmax=100     Maximum CDP number of model                   

 cdpinc=1       CDP increment                                 

 cdpdist=50     Distance between CDPs                          

 firstcdpvel=1  First CDP                                     

 lastcdpvel=1   Last CDP                                      

 cdpnum=1       Number of CDPs between velocity traces        

  If outfmt=fdmodel, parameters nx through cdpnum             

  are required by the ADS VIEWS program                       

 modname=views  Model name for FDModel output                 

 cdphdr=cdp     For FDModel output, trace header containing CDP

 depthhdr=f2    For FDModel output, trace header containing depth

                If cdphdr and depthhdr are not used, no horizon

                data will be written to model_out             

 east=x         For Landmark ASCII format, assign X-coord to  

                Landmark Easting field, and Y-coord to Landmark

                Northing field; east=y reverses the assignment

 xy=yes         Use xy=no to omit XY coordinates.             

                If XYs are omitted the output file may not be 

                useable, if processed by a program which expects

                XYs. If xy=yes, and input format does not have

                XYs, then no XYs are in the output.           

 xhdr=gx        Trace header to use for X coordinate          

 yhdr=gy        Trace header to use for Y coordinate          

 lhdr=ep        Trace header to use for 3D iline number       

 xlhdr=cdp      Trace header to use for 3D xline number       

                Formats par3d, vel3d, views, and sbase3 require

                3D line number.                               

 NOTES:                                                       

  1)When converting from segy to ASCII, use suresamp prior to 

    bhpvelutil to set trace length and sample interval to     

    whatever is desired for the ASCII output.                 

 EXAMPLES:                                                     

  TGS to Landmark:                                            

    bhpvelutil infmt=tgs outfmt=lm < tgs.asc > tgs.lm         

  SEGY to VIEWS Binary:                                       

    bhpvelutil outfmt=fdmodel < v4sm.su model_out=views.bin \

    dx=164 cdpmin=18800 cdpmax=20400 cdpinc=4 cdpdist=164 \  

    firstcdpvel=18800 lastcdpvel=20400 cdpnum=4 nx=401        

  SEGY to SeisBase:                                           

    suresamp < 2637-BES.vrmst.su nt=200 |                     

    bhpvelutil > 2637-BES.sb2 outfmt=sbase2 line=1367-BS