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As an alternative to downward continuation and interpolation of the source
and receiver at the same time, we can also finish the prestack slant stack migration
with
![\begin{picture}
(16,8)(.24,-2.)
\thicklines
\put(6,6){\makebox[3cm]
{$U(\ome...
...]
{$U_{S}(\omega,z+\Delta z,k)$}}
\put(7.8,-3.7){\vector(0,-1){.7}}\end{picture}](img14.gif)
![\begin{picture}
(16,8)(-.48,.5)
\thicklines
\put(6,6){\makebox[3cm]
}
\put(....
...[3cm]
{$U(\omega,z+\Delta z,k)$}}
\put(7.8,-3.7){\vector(0,-1){.5}}\end{picture}](img15.gif)
dum1
Figure 2 Computational flow chart of prestack slant stack
migration with two-pass PSPI.
fig1
Figure 3 The impulse response of prestack slant stack migration with PSPI;
p=.00021 s/m with v1(z)=1500+0.5z m/s, and v2(z)=2500+0.5z m/s.
fig2
Figure 4 The superposition of the impulse response of v=2000 m/s and v1(z)=1500
m/s at y=0 m and of v2(z)=2500 m/s with y=2560 m by PSPI.
PSPI by splitting into two pass. Its implementation is illustrated in the steps shown
in Figure 2.
The U1S and U2S are the wavefields extrapolated by v1 and v2
separately for the source. After the interpolation, we get US. Then wavefields are downward continued separately for the receiver by v1 and v2.
By interpolating the wavefield between U1(S+G) and U2(S+G), we
can complete
the whole wave extrapolation.
Next: DISCUSSION OF RESULTS
Up: IMPLEMENTATION FOR LATERAL VELOCITY
Previous: One-pass PSPI
Stanford Exploration Project
11/17/1997
