Miljørisikoanalyse (MRA) for Oseberg Øst i Nordsjøen

(1)

Miljørisikoanalyse (MRA) for Oseberg Øst i Nordsjøen

Statoil ASA

Rapportnr.:5HY Dokumentnr.:(,*' Dato for utgivelse:

(2)

(3)

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(4)

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(5)

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DEFINISJONER OG FORKORTELSER

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Effektområde

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Eksempelområde

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treff 6DQQV\QOLJKHWIRUDWHQ[NPUXWHWUHIIHVDYROMHIUDHWSRWHQVLHOWXWVOLSS

Restitusjonstid

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1 INNLEDNING

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1.1 Aktivitetsbeskrivelse

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Figur 1-1 /RNDVMRQDY2VHEHUJVWIHOWHWL1RUGVM¡HQ

(9)

1.2 Hensikt/formål

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1.3 Statoils akseptkriterier for akutt forurensing

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Tabell 1-1 6WDWRLOVLQVWDOODVMRQVVSHVLILNNHRJIHOWVSHVLILNNHDNVHSWNULWHULHUIRUIRUXUHQVLQJ Miljøskade Varighet av skaden

(restitusjonstid)

Installasjonsspesifikke akseptkriterier

Feltspesifikke akseptkriterier

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1.4 Gjeldende regelverkskrav

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1.5 Rapportoppbygning

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Figur 1-2 'HOSURVHVVHQLHQPLOM¡ULVLNRDQDO\VHIUDLQQJDQJVGDWDWLONRQNOXVMRQ.DSLWWHOKHQYLVQLQJHQ DQJLUKYRULUDSSRUWHQXOLNHW\SHULQIRUPDVMRQHQSUHVHQWHUHVRJNRPPHQWHUHV

(12)

2 BESKRIVELSE AV UTBLÅSNINGSSCENARIOER

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2.1 Innledning

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Figur 2-1 2VHEHUJVWSODWWIRUPHQLQRUGOLJHGHOHQDY1RUGVM¡HQ6WDWRLO

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2.2 Aktivitetsoversikt og utblåsningssannsynligheter

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$NWLYLWHWVRYHUVLNWRJVDQQV\QOLJKHWHQIRUXWEOnVQLQJIRU2VHEHUJVWLHWnormalt aktivitetsårHUYLVWL 7DEHOORJPHGVDQQV\QOLJKHWHQIRUKHQKROGVYLVRYHUIODWHRJVM¡EXQQVXWEOnVQLQJL7DEHOO

Tabell 2-1$NWLYLWHWVRYHUVLNWRJVDQQV\QOLJKHWIRUXWEOnVQLQJSHUDNWLYLWHWIRU2VHEHUJVWLHW K¡\DNWLYLWHWVnU6WDWRLO

Aktivitet Totalt antall

operasjoner

Frekvens Frekvens per

operasjon Total frekvens

%RULQJROMHEU¡QQ [ [

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Totalt 1,23 x 10^-³

Tabell 2-26DQQV\QOLJKHWIRURYHUIODWHRJVM¡EXQQVXWEOnVQLQJIRU2VHEHUJVWLHWK¡\DNWLYLWHWVnU Utblåsningslokasjon Fordeling av

utslipp

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Aktivitet Totalt antall

operasjoner

Frekvens Frekvens per

operasjon Total frekvens

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%U¡QQNDEHO:LUHOLQHROMHEU¡QQ [ [

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Totalt 6,53 x 10^-4

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Tabell 2-4 6DQQV\QOLJKHWIRURYHUIODWHRJVM¡EXQQVXWEOnVQLQJIRU2VHEHUJVWLHWQRUPDOW DNWLYLWHWVnU

Utblåsningslokasjon Fordeling av utslipp

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2.3 Utblåsningsrater og varigheter

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(15)

3 OLJEDRIFTSMODELLERING

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3.1 Oljetype og oljens egenskaper

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(16)

3.2 Oljedriftsmodellen

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(17)

3.3 Modellens begrensning og krav til inngangsdata

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(18)

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3.4 Beskrivelse av utblåsningsscenarier

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(19)

3.5 Oljedriftsmodellering – Resultater

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(20)

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(26)

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(27)

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(29)

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(31)

4 METODIKK FOR MILJØRETTET RISIKOANALYSE

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(32)

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(33)

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(34)

5 MILJØBESKRIVELSE

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(35)

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(36)

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6 MILJØRETTET RISIKOANALYSE – RESULTATER

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(38)

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(39)

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(40)

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(41)

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(42)

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(43)

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(44)

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(46)

Marine pattedyr - Overflateutblåsning

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(47)

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(48)

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(49)

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(50)

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6.2 Miljørisiko

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6.2.1.1 Pelagisk sjøfugl

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6.2.1.2 Kystnær sjøfugl

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(53)

6.2.1.3 Marine pattedyr

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6.2.1.4 Strandhabitat

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