5 vibroseis: a very special source
DESCRIPTION
Presentation of chapter 5 of Seismic Acquisition from yesterday to tomorrowDISC series SEGTRANSCRIPT
1D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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2D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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( i ) l b i l i f h l i d i b i f i d
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( i ) a t le a s t a su b s t a n t i a l p o r t i o n o f t he t o t a l t r a n s m i t te dv i b r a t i o n e ne r gy o f s a i ds i g n a l w h ic h i s re c e iv e d a t s a i d se c o n d p o i n t, by•
( i i ) s a i d c o u n te r p a r t s i g n a l ,–
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3D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
Fr o m Cr a w f or d a n d D o ty, 1 9 6 0 4D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
5D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
Fr o m Cr a w f or d a n d D o ty, 1 9 6 0 6D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
C o u r t e sy o f I n d u s tr i a l V e h ic l e s 7D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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I n tr o du c t i o n
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8D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
9D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
1 0D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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1 1D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w Fr o m L er w i l l, 1 9 8 1
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1 2D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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1 3D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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I n tr o du c t i o n
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V i b r a t o r p r i n c i p le
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1 4D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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I n tr o du c t i o n
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V i b r a t o r p r i n c i p le
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1 5D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
1 6D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
1 7D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
1 8D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
1 9D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
2 0D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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I n tr o du c t i o n
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V i b r a t o r p r i n c i p le
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2 1D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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Fg Mrγγγγr MbγγγγbM
γγγγr
γγγγFg Mrγγγγr Mbγγγγb
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Sa l l a s 1 9 8 4
2 2D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o wMr
Mb
γγγγb
Fg
2 3D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
2 4D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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I n tr o du c t i o n
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V i b r a t o r p r i n c i p le
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2 5D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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Fr o m S a l l a s, 2 0 1 02 6D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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I n tr o du c t i o n
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V i b r a t o r p r i n c i p le
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2 7D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
2 8D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w C o u r t e sy o f T O T A L
2 9D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w C o u r t e sy o f S t or e n gy
1 1- 1 3 / 1 2 / 2 0 0 4 C o u r t e sy o f S t or e n gy
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V i b r a t o r p r i n c i p le
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3 1D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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500 Fr o m Sc h i s s e l é e t a l., 2 0 0 93 3D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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3 4D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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I n tr o du c t i o n
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V i b r a t o r p r i n c i p le
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V i b r a t o r s i g n a l
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3 5D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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3 6D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o wPf D
Nv Sr df/dt
Sl
fSr
NvDPffSignal ≈≈≈≈
fSrfNoise ≈≈≈≈
fmax - fmin
Nv SlDPf
( a ft e r c o r r e l a t i o n by a s w e e p o fu n i t a m p l i t u d e s p e c t ru m )( a ft e r c o r r e l a t i o n by a s w e e p o fu n i t a m p l i t u d e s p e c t ru m )3 7D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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fSr
RaNrdsNvDPffSSE
3 8D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
Pf D
Nv Sr df/dt
ds Nr
Ra
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fmax - fmin
Ra Ns SlNrdsNvDPffSSE
3 9D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
Pf D
Nv Sr df/dt
ds Nr
Ra Ns
Sl
Ns Sl Ns Sl
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0.2
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0.4
0.5m e (s )
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0.9
1
Tim0 10
0.8
0.9
1
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0.55
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Ga i n : 8 0 dB) -40
-30
-20
Am
plitude S
pectrum
(dB)
1 s
2 s
4 s
8 s
16 s
32 s
0.65
0.7
0.75 1 2 4 8 1 6 3 2S we e p Le n gt h (s )Tim e (s )
4 1
0 10 20 30 40 50 60 70 80 90 100-80
-70
-60
-50
Frequency (Hz)
Am
plitude S
pectrum
(dB)
S w e e p : 3- 7 3 Hz – V i br a t or : S er c e l N o m a d 9 0
0
0.05
0.1
0.15
0.2
Ga i n : 5 0 dB)
-20
-10
0
10
20
Am
plitude S
pectrum
(dB)
1 s
2 s
4 s
8 s
16 s
32 s
4 2
0 5
0.25
0.3
0.35
0.4
0.45
0.5
Tim e (s )
0 10 20 30 40 50 60 70 80 90 100-60
-50
-40
-30
-20
Frequency (Hz)
Am
plitude S
pectrum
(dB)
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I n tr o du c t i o n
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V i b r a t o r p r i n c i p le
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V i b r a t o r s ig n a l
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V i b r a t o r s ig n a l- t o- n o i se r a t i o
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4 3D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
C o u r t e sy o f C G G V er i t a s4 4D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
Fr o m S a l l a s, 2 0 1 04 5D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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4 6D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
Sweep
D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w 4 7- 2- 101
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V i b r a t o r p r i n c i p le
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V i b r a t o r s i g n a l
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V i b r a t o r s ig n a l- t o- n o i s e r a t i o
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V i b r a t o r l i m i t s
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4 8D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
4 9D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
5 0D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
5 1D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
5 2D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
5 3D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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5 4D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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I n tr o du c t i o n
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V i br a t or pr i n c i p le
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V i br a t or s ig n a l
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V i br a t or s ig n a l- t o- n o i se r a t i o
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V i br a t or l i m i t s
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D i s t or t i o n
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5 5D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
5 6D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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5 7D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
1 1 1 1
i 1 -1 –i
0° 0° 0° 0°
90° 0° 180° –90°
i -1 1 –i
1 -1 -1 1
90° 180° 0° -90°
0° 180° 180° 0°
5 8D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
5 9 D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
6 0D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
Fr o m M e u n i er a n d B i a nc h i, 2 0 0 26 1D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
Fr o m B o u s k a, 2 0 1 06 2D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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6 3D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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6 4D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w
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6 5D I S C 2 0 1 1 Se is m ic Ac q u is it io n fr o m Ye s t e r da y t o To mo r r o w