geostreamer breakfast seminar · title: geostreamer breakfast seminar author: martin widmaier...
TRANSCRIPT
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Hvordan gjennomføre store seismiske innsamlinger
Gunhild Myhr, PGS
Fisk og Seismikk 5-6 April Tromsø 2017
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Agenda
• Hva er seismikk?
• Hvorfor samler vi inn store seismiske surveys?
• Økt effektivitet, ny teknologi – reduserer risiko
for miljøskader
• Planlegging og miljøhensyn
• Oppsummering
2 Fisk og seismikk Tromsø 2017
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Hva er seismikk?
3 Fisk og seismikk Tromsø 2017
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Hovedelementer i seismiske innsamlinger
• Seismiske kilder
– Genererer lyd som spres nedover som lydbølger
• Mottagere
– Lyttekabler med sensorer
• Mottaker system
– Digitaliserer og lagrer data
4 Fisk og seismikk Tromsø 2017
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Seismikk innsamling
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Seismikk
Fisk og seismikk Tromsø 2017
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Hvordan produserer vi lyd: Marine seismiske kilder
Svolværkonferansen 2016
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Marine seismiske kilder
7 Fisk og seismikk Tromsø 2017
• Luft under trykk slippes ut i vannet
• Luftboblen ekspanderer som fører til
at trykket i boblen minker
• Når lufttrykket i boblen blir lavere enn
hydrostatisk trykk, vil trykkreftene
virke i motsatt regning og bobla vil
etterhvert kontraktere
• Bobbla fortsetter å oscillere til den når
overflaten
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Inline (m)
Cro
sslin
e (
m)
SE
L [d
B r
e 1
µP
a²s
]
• Compute decay of Sound Exposure Level (SEL)
with distance
• Define circumference in which threshold SEL value
will likely not be exceeded
Sound Propagation Modelling: Planning of Exclusion Zones
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> 99 % < 1 %
Cetaceans
10
140 dB
100 dB
60 dB
100 Hz 1000 Hz 10 000 Hz 100 000 Hz
Human
Harbor Porpoise
Minke Whale
Ambient sea noise (sea state 4) 100 dB (1 μPa)
Whale breaching 200 dB (1 μPa)
Calving iceberg 220 dB (1 μPa)
Seismic Array (actual) at 1 m 235 dB (1 μPa)
Sperm whale click 236 dB (1 μPa)
Lightning strike 260 dB (1 μPa)
Undersea earthquakes 272 dB (1 μPa)
Permanent
Hearing Loss
Physical
Trauma
Temporary
Hearing Loss
Mortality Change in
behaviour Stress Disruption of
migration
Masking Stranding Displacement
Injury Disturbance
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Hvorfor trenger vi store surveys?
Fisk og seismikk Tromsø 2017
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Multi-Client Propritær
Regional 2D
seismikk
GravMag surveys
Utforsknings 3D
seismikk Lisens-
tildelinger
Tolkning &
borebestemmelse
Avgrensnings-
brønn
Funn
Baseng evaluering
Umodne områder
Utforskning
Utvikling
Produksjon
Seismikk – Det viktigste leteverktøyet
Tolkningsstudier
Regional
2D/3D
seismikk
PRM/4D
seismikk
Studier &
rundesøknader
Tolkning & survey
design
Boring PRM/4D seismikk PRM/4D
seismikk 3D
Umodne områder Modne områder
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Ny teknologi fører til økt effektivitet
16
Sail Line
Separation
Fisk og seismikk Tromsø 2017
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PGS Fleet Capability Highlights
Wider Spreads
• Ramform Titan acquired two surveys with a 16 x 100m spread. Industry first.
• 18 x 100m operations ongoing. Biggest spread ever.
• Ramform Sovereign is towing 12 x 150m.
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Svolværkonferansen 2016
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Flere streamere og økt effektivitet
6 Streamer Vessel
(2006)
16 Streamer Vessel (2016)
Configuration 6 streamers
with 100m separation
16 streamer
with 75m separation
Sail Line Separation 300m 600m
Number of Source
Points
10,000 5,000
Survey Duration 40 days 20 days
18 Fisk og seismikk Tromsø 2017
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Antall 3D seismiske streamer båter tilgjengelig har blitt redusert betraktelig
Num
be
r o
f ve
sse
ls *
0
10
20
30
40
50
60
70
2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
6 str 8 str 10 str 12 str 14 str 16 str
Antall Seismiske båter tilgjengelig
* Figures relate to year end status
19 Fisk og seismikk Tromsø 2017
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Reduksjon i antall seismikk båter på norsk sokkel
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Seismikk båter på norsk sokkel
2010 2011 2012 2013 2014 2015 2016 2017
3D 16 21 22 19 16 11 7 10
2D 6 7 4 4 5 0 1 0
Totalt 22 28 26 23 21 11 8 10
Fisk og seismikk Tromsø 2017
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Operatørkontrakter: Dramatisk fall i antall seismiske undersøkelser
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Planlegging og Miljøhensyn
Fisk og seismikk Tromsø 2017
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Sound Propagation Modelling
Marine Mammal Observers Passive Acoustic Monitoring
Soft-start
Fisheries Liaison Officer Community Liaison Officer
Sound Monitoring Thermal Imaging
Exclusion Zone
Project Risk Assessment Environmental Impact Assessment Environmental Permit
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• IAGC legger vekt på sine medlemmer om at Veiledningen skal etterleves og
holdningen til at fiskeri har fortrinn i konfliktsituasjoner blir etterlevd.
• Arbeidet for sameksistens mellom fiskerinæringen og seismikk selskapene har vært et
hovedfokus i IAGC og vil fortsatt være det fremover. Arbeidet har ført frem og vi ser i
dag ytterst få konflikter mellom fiskeri og seismikk innsamling.
Fisk og seismikk Tromsø 2017