A general reconstruction scheme for dominant azimuth 3D seismic data

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A general reconstruction scheme for dominant azimuth 3D seismic data Powered By Docstoc
					CFP technology

DELPHI consortium
                            CFP method
              OWT                     TWT                          OWT
    x                           x                            x

z                           z                          z




        Focusing Operator       x     Data                   x   CFP gather
    x

t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 2
                            CFP method
              OWT                     TWT                    x     OWT
    x                           x

z                           z                          z




    x   Focusing Operator       x     Data                   x   CFP gather


t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 3
                            CFP method
              OWT                     TWT                    x     OWT
    x                           x

z                           z                          z




    x   Focusing Operator       x     Data                   x   CFP gather


t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 4
                            CFP method
              OWT                     TWT                    x     OWT
    x                           x

z                           z                          z




    x   Focusing Operator       x     Data                   x   CFP gather


t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 5
                            CFP method
              OWT                     TWT                    x     OWT
    x                           x

z                           z                          z




    x   Focusing Operator       x       Data                 x   CFP gather


t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 6
                            CFP method
              OWT                     TWT                    x     OWT
    x                           x

z                           z                          z




    x   Focusing Operator       x     Data                   x   CFP gather


t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 7
                            CFP method
              OWT                     TWT                    x     OWT
    x                           x

z                           z                          z




    x   Focusing Operator       x     Data                   x   CFP gather


t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 8
          Principle of equal traveltime
              OWT                                          x     OWT
    x

z                           Operator:                  z
                            response of one point in
                            the subsurface

                            CFP gather:
        Focusing Operator   response of the same               CFP gather
    x                                                      x
                            point in the subsurface
t                                                      t
                            Operator and CFP gather
                            have the same travel
                            times for the same focal
                            point


                                     CFP technology                         slide 9
                        CFP method
                    (erroneous operator)
              OWT                     TWT                          OWT
    x                           x                            x

z                           z                          z




    x   Focusing Operator             Data                       CFP gather
                                x                            x

t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                        slide 10
                        CFP method
                    (erroneous operator)
              OWT                     TWT                          OWT
    x                           x                            x

z                           z                          z




        Focusing Operator       x     Data
    x                                                        x   CFP gather


t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 11
                        CFP method
                    (erroneous operator)
              OWT                     TWT                          OWT
    x                           x                            x

z                           z                          z




    x   Focusing Operator             Data                       CFP gather
                                x                            x

t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 12
                        CFP method
                    (erroneous operator)
              OWT                     TWT                          OWT
    x                           x                            x

z                           z                          z




    x   Focusing Operator             Data                       CFP gather
                                x                            x

t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 13
                        CFP method
                    (erroneous operator)
              OWT                     TWT                          OWT
    x                           x                            x

z                           z                          z




    x   Focusing Operator               Data                     CFP gather
                                x                            x

t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 14
                        CFP method
                    (erroneous operator)
              OWT                     TWT                          OWT
    x                           x                            x

z                           z                          z




    x   Focusing Operator             Data                       CFP gather
                                x                            x

t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 15
                        CFP method
                    (erroneous operator)
              OWT                     TWT                          OWT
    x                           x                            x

z                           z                          z




    x   Focusing Operator             Data                       CFP gather
                                x                            x

t                           t                          t



                            *                         =
                                                     Stack



                                    CFP technology                            slide 16
                  Erroneous Focusing
                       Operators
Depth %
Depth -10 - 10%    Depth + 10%     No error       Vel - 10%   Vel + 10%




 Correct focusing operator is in between:
 erroneous Operator and its related erroneous CFP gather
                                 CFP technology                slide 17
          Differential Time Shift panel
              OWT                                             x     OWT
    x

z                                                         z




    x   Focusing Operator                                     x   CFP gather


t
                                          *               t
                                 x   DTS panel


                            dt
                                                      0



                                     CFP technology                            slide 18
         Focusing Operator updating
     x        DTS panel


dt                                                          Half of tracked
                                       0                    time in DTS panel
                                                  +         Previous input
     x
     CFP gather & Focusing Operators
                                                            focusing operator
t
                                                  =
                                                            Updated
                                                            focusing operator

                                           CFP technology               slide 19
Iterative Focusing Operator
          updating




                               No subsurface model is
                            involved in this process, only
                                    seismic data!
           CFP technology                           slide 20

				
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