Page 126 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists
P. 126

(a).
       109
                                                                                      represent
                                                                                       highlighted  in

       Processing
                                                                                      raypaths
                                                                                       three  CMP  traces
                                                                                      for  three  shot  records.  Highlighted
                                                                                       the
                                                                                       and  gather for
                                                                       Le—
                                 Ss,

                                                                                      and  shot  gathers
                                                                                       diagram
                                                                                       b)  Raypath
                                                                                      Raypath  diagram
                                                                                       traces.
                                                                                       midpoint  (CMP)
                                                                                      Gather.a)
                                                                                       three  common
                                                                                      5.9
                                                                                      FIGURE
                                                                              g
                                                                                  3
                                                                         ‘
                                                               Ee
                                                                                .
    =  RE  EN OR
          a)  Selected  raypath  and  Common   a  gather  for  a  primary  reflection.  Shot  Gathers   Re  ee   Be   Fe   Ry   Ry   Ss,  x—   =   and   Ry   Fe   A,   Ry   FR,   :   A,   1  Sh ot   Bay  sa  My   Fe   Fe   As   Ae    !  Shot2     f   s   ser  "Fe   Ay   Fe   Fy   Fy   Fei   Fy  Shot3   Compete   HN              Gather   CMP   Db   Common   Bin me  ee   ee  ;  Certain   is  profile   3     in   taken   trace   intercept  T-axis   =   ty   up   back  interface,  straig
                                                                  of
                                                                                       are
                                                                                Geldart,
                                                                be
                                                          be
                                                                            reflection
                                                                              can
                                                                must
                                                          may
      Analysis   surface  multiple  on  raypath  diagram   data   Earth.   the   product   interpretation   processing   and   gathers   highlighted   gather,   3-fold   a  follows
      Waveform   5.8  FIGURE   shotpoint   shotpoint  gather.   the   that   the   that   final   literal   seismic   of   Sheriff   shot   traces   CMP   one   interface
      And                                                 is  method   within   created,  so   The   to   process   to   treatment   of   9   different   three   same   the   comprises   receiver   to
      Processing,                                         reflection   depth  mimicking   image   the   section.   cross   pitfalls  many   taken   steps   detailed   Chap.   1980;   from  traces   The  gathers.   5.9b;   Fig.   illustrations,   horizontal   a   Tymo   interface,
      Acquisition,                                        seismic   enhancing   geological   there   are   6).   general   and  thorough   Treitel,   and   1976).   process,   (CMP)   in  gather   subsequent   from  reflection       +   ty   =   Ty        to  source,
      Reflection:   ty                                    the   of   downward,   axis   at  aimed   a   of   as  however,   (Chapter   Sequence   the   of   More   below.   (Robinson   al.,   et  of Telford   the  midpoint  gather   CMP   the   in   steps   profile.   A       from   time
      Seismic   Reflection             Multiple           appealing-aspect   time   the   thus   are   representation   wisely,   profiles  reflection   descriptions   and   presented   elsewhere   In  Gather   common   as   comprise   5.9a   processing   seismic   Analysis   to:   travel   =   T,
      Chapter5   Primary               Surface            One   with  plotted   processing  steps   abstract   interpreted   seismic   Processing   Objectives   are   found   1995;  pp.  370-395   1.   rearranged   Fig.   in   bold   the  through   stacked   the   2.  Velocity   bola,  according   where:
               :                                         .      an       General   data   be   on
      108
               Wostes:                 Vis                                                 3
   121   122   123   124   125   126   127   128   129   130   131