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Raw Data The full dataset is as big as 45Gb, avaible on DLT tapes.
Common-azimuth Data To be done.
Velocity Model /data_3d/elf_north_sea/L7d-vel.H
Velocity model created by Elf & IFP (Project ``Helios'') using the so-called ``SMART'' method (Sequential Migration Aided Reflection Tomography). The structure of the salt dome is highly 3-D, with serious illumination problems under its edges (figure ).
Stack /data_3d/elf_north_sea/L7d-near-nmo-stack-fine.H
Near-offset (0-1000m) NMO-stack
Zero-offset Migration /data_3d/elf_north_sea/comaz_zo_salt_fine.h
Prestack 2-D line
Usage none (yet).
Geometry Acquisition: 2 sources, x streamers (most likely 3).
In3d:
---------------------------------
********** L7d_all.H ************
4 -esize Synched data_format-xdr_float
---------------------------------
n1=1500 o1=0.000000 d1=0.004000 label1=time
n2=7411523 o2=1.000000 d2=1.000000 label2=trace number
Data: in=/scrsa3/louis/Elf/Data/L7d_all.H@
7411523 elements, 44469138000 bytes in data file
---------------------------------
Attr3dhead:
key |
min |
max |
mean |
nzero |
rms |
norm |
cdp |
2900.0000 |
3900.0000 |
3389.9319 |
7411523 |
3400.5400 |
9257668.44 |
offset |
186.0000 |
3571.0000 |
1764.1710 |
7411523 |
1989.4291 |
5416044.20 |
ncdp_s |
2773.4941 |
3926.8994 |
3438.5354 |
7411523 |
3449.2773 |
9390351.31 |
nligne_s |
1346.6554 |
1520.4437 |
1428.9248 |
7411523 |
1429.5942 |
3891943.38 |
ncdp_g |
2772.9077 |
4026.9609 |
3341.0813 |
7411523 |
3352.4868 |
9126847.67 |
nligne_g |
1347.1848 |
1528.9202 |
1429.6726 |
7411523 |
1430.3911 |
3894112.88 |
s_x |
-1686.7405 |
13691.9580 |
7180.4541 |
7411523 |
8044.3945 |
21900150.11 |
s_y |
1416.3849 |
5761.0933 |
3473.1201 |
7411523 |
3641.2247 |
9912910.97 |
g_x |
-1694.5596 |
15026.1074 |
5881.0698 |
7411522 |
6939.6676 |
18892629.00 |
g_y |
1429.6204 |
5973.0039 |
3491.8162 |
7411523 |
3671.1157 |
9994286.74 |
nline |
1354.4266 |
1515.5315 |
1429.2987 |
7411523 |
1429.9876 |
3893014.44 |
aoffset |
185.6369 |
3571.9861 |
1764.5095 |
7411523 |
1989.8103 |
5417081.89 |
azimuth |
-1.2745 |
1.5323 |
-0.0261 |
7411431 |
0.1345 |
366.08 |
cmp_x |
-8.3235 |
13338.0527 |
6530.7617 |
7411522 |
7446.8040 |
20273262.93 |
cmp_y |
1610.6659 |
5638.2871 |
3482.4683 |
7411523 |
3654.9572 |
9950296.70 |
offset_x |
-3463.4939 |
3383.3154 |
-1299.3843 |
7411523 |
1980.6512 |
5392147.21 |
offset_y |
-990.2041 |
786.0776 |
18.6959 |
7411431 |
190.6978 |
519157.71 |
Problem Multipathing - Illumination problems / Shadow zones - Common-angle gathers
History of Data Dataset given to SEP in 1998, originaly for testing AMO and common-azimuth migration. The contact at Elf Exploration Production is Henri Calandra.
Preprocessing A correction of amplitude has been applied: geometrical spreading
Also, the multiples due to sea bottom have already been removed.
Proprietary Considerations The L7d data are free to be used by SEP only, including publications in articles or SEP reports with the usual acknowledgements to Elf Aquitaine.
vel-model
Figure 1 Elf ``SMART'' velocity model
nmo-stack
Figure 2 NMO-stack of the near offsets (0-1000m)
zo-mig
Figure 3 Zero-offset migration of the near offsets (0-1000m)
2D-line-nmo-stack
Figure 4 NMO-stack of the near offsets (0-1000m), section corresponding to the 2-D synthetic data
2D-line-zo-mig
Figure 5 Zero-offset migration of the near offsets (0-1000m), section corresponding to the 2-D synthetic data
Next: Mora: REFERENCESUnocal salt dome
Up: Vaillant: STANFORD EXPLORATION PROJECTElf
Previous: Vaillant: STANFORD EXPLORATION PROJECTElf
Stanford Exploration Project
1/15/2002