GLOBE Claritas™
Radon Demulitple using PRT_DEMULT
www.globeclaritas.com
Modelled Gather and Parameters120 Traces
Offsets 100 to 3075 metres
25m increment
Seafloor at 400ms TWT
Click on ruler with RMB
This selects Parabolic Ruler
Can measure “far offset moveout”
Primaries are flat
Multiples down dip
1200ms far-offset moveout
~40ms far-offset moveout
348ms far-offset moveout
328ms far-offset moveout300ms far-offset moveout
677ms far-offset moveout
Need to model data to include full positive range of “far offset moveout” values
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Modelled Gather in Radon Transform SpacePrimaries are flat : P=0
Multiples down dip: P= =ve
1200ms far-offset moveout
~40ms far-offset moveout
348ms far-offset moveout
328ms far-offset moveout300ms far-offset moveout
677ms far-offset moveout
P=0
Note that events form crosses in Radon Transform Space
PRTF performs the Radon transform
350 p-values used in this case
Moveout range from -400 to +1600ms
2000ms total for the transform
Each p-value corresponds to 2000/350 = 5.7ms
Nyquist for 5.7ms sample interval is 87.5Hz
P value is in COR trace header, plotted over data in this display
Gather Shallow events (~500ms) with few
traces not well resolved
Module : PRTF
www.globeclaritas.com
PRT Demultiple Applied to these dataPrimaries are flat : P=0
Multiples down dip: P= =ve
P=0
Moveout range from -400ms to +1600ms
Removing +30ms to +1596ms
Start Time is 630ms
Input
Module : PRT_DEMULT
Output
Not applied above 630ms TWT
Some linear artefacts –“tails” of crosses extend over P=0
Moveout close to Noise_MS cut-limit and so is not fully removed
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