Seismic Monitoring of the Heidrun, Norne and Midgard Fields Using Steerable Streamers

Eiken, Ola; Aronsen, Hans; Furre, A.-K.; Klefstad, L.; Nordby, L.H.; Osdal, B.; Skaar, M.

doi:10.3997/2214-4609-pdb.6.a30

Cited by 7 publications

(1 citation statement)

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“…Indeed, although the limitations of streamers are reduced with streamer-steering, streamer-steering can only have a small effect of just a few degrees, while feath-ering is sometimes 10 0 or more. Eiken et al (2003) report a natural streamer feathering within +/-6 o for 95% of Norwegian Sea operations, and a streamer steering capability of +/-3 o that is not sufficient to achieve a zero-feather survey in a cost effective manner. Streamer steering also introduces noise that can be difficult to remove.…”

mentioning

confidence: 97%

Mirror imaging of OBS data

Grion¹,

Exley²,

Manin³

et al. 2007

First Break

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mentioning

confidence: 97%

Mirror imaging of OBS data

Grion¹,

Exley²,

Manin³

et al. 2007

First Break

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Surface geophysical monitoring of gas fields: some experiences

Eiken

Tollefsen

Aanvik

et al. 2005

PGC

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Gasproduction hassomedifferent reservoirtechnicalchallengescompared to oilproduction,dueto highermobility ofthe hydrocarbons. Widerspatialdistribution ofwells andless infill drillingmake estimatesof remainingreserves,andoptimization ofproduction ratesandlatefieldlife, particularly important objectivesfor reservoirm onitoring.Changingawater-flushed zonef rom initialt or esidualgass aturation maycausemodest changesinseismic velocities,andmoresignificant changesindensities. Changesinthe seismic responsemaybe modest,whilemass changesmaybe detectablebygravimetric monitoring.Decreasingporepressurecausesslight velocity increase, sometimestoo small to observeintime-lapseseismic data.Surface or seafloor subsidence may be included int he reservoirmonitoringprogram.2Dseismic andg ravimetric monitoringh asbeens elected ass urface geophysicalm onitoringtechniquesfor Troll gasp roduction,f or reasons ofc ost andquality Afters ixy ears ofproduction,achange inr esponsea tt he gas-liquid contactcanbe observed bothon seismic andgravimetric time-lapsedata, andpressuredepletion has caused aslighttime-shift. Onthe SleipnerEast Field, waterrisehasbeenmapped bycombining4Dseismic and repeated well saturation-logdata, andthisinformation hasbeenused inplanningofnewwells andinthe further reservoirm anagement. Geophysicalm onitor programs havef urtherbeeninitiated on the Midgarda ndS nøhvit gasfields. Theseareexpected to provide important input to predictions ofproduction behaviour,to enabletimely actions int he reservoirmanagement,a ndhence to increasethe valueofthe asset.

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