Passive Seismic ImagingStanford Exploration Project passive seismic imaging Brad Artman.

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Presentation transcript:

Passive Seismic ImagingStanford Exploration Project passive seismic imaging Brad Artman

Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

Passive Seismic ImagingStanford Exploration Project passive imaging not event location structural imaging –reflection seismology: subsurface investigation from the time-delayed reflections of sound off of geologic variations. –passive imaging: with no application of controlled experimental sources, a relationship between a recorded transmission wavefield and reflection wavefields is required. requires: stationary seismometers, lots of disk space

Passive Seismic ImagingStanford Exploration Project capitalizing on ambient noise earthquake arrivals ocean waves wind vibrations coupled with foundations cultural activity –vehicle and boat traffic –drilling noise –nearby seismic acquisition

Passive Seismic ImagingStanford Exploration Project transmission wavefield time (s) depth (m) position(m)

Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1r2

Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1r2

Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1r2

Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1 r1 r1 r2 lag r1r2

Passive Seismic ImagingStanford Exploration Project r1r2 t r1 r1 r1 r2 twt r1r2 ambient noise

Passive Seismic ImagingStanford Exploration Project r1r2 t r1 r1 r1 r2 twt r1r2 ambient noise

Passive Seismic ImagingStanford Exploration Project backscattered PP r1r2 t r1 r1 r1 r2 twt r1r2

Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1 r1 r1 r2 lag twt r1r2

Passive Seismic ImagingStanford Exploration Project position(m) time(s) lag(s) offset(m)

Passive Seismic ImagingStanford Exploration Project position(m) time(s) lag(s) offset(m) 300

Passive Seismic ImagingStanford Exploration Project position(m) time(s) lag(s) offset(m)

Passive Seismic ImagingStanford Exploration Project position(m) time(s) lag(s) offset(m) -300 n long traces n short traces 2

Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

Passive Seismic ImagingStanford Exploration Project The Sun as a Laboratory Acoustic Daylight Imaging via spectral factorization, Rickett SEP-100

Passive Seismic ImagingStanford Exploration Project 2D Experiment 1 Receiver line

Passive Seismic ImagingStanford Exploration Project Break Point?

Passive Seismic ImagingStanford Exploration Project Whole Data Volume

Passive Seismic ImagingStanford Exploration Project 8 Consecutive Lines

Passive Seismic ImagingStanford Exploration Project 8 Spaced Lines

Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

Passive Seismic ImagingStanford Exploration Project active synthetic reflection gather active migration

Passive Seismic ImagingStanford Exploration Project passive synthetic correlated passive gather passive migration

Passive Seismic ImagingStanford Exploration Project correlated passive gather passive migration passive synthetic

Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

Passive Seismic ImagingStanford Exploration Project 2.5 D V app = V/cos (  )

Passive Seismic ImagingStanford Exploration Project earthquake energy

Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

Passive Seismic ImagingStanford Exploration Project Artman GeoServices

Passive Seismic ImagingStanford Exploration Project Enlarged data set

Passive Seismic ImagingStanford Exploration Project 5min Night

Passive Seismic ImagingStanford Exploration Project 5min Night

Passive Seismic ImagingStanford Exploration Project 10min Day

Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

Passive Seismic ImagingStanford Exploration Project Valhall one of the North sea giant fields partners Amerada Hess, Shell and Total reservoir highly porous chalk first production1982 field life2028

Passive Seismic ImagingStanford Exploration Project Valhall Life of Field Seismic Permanent field wide seismic array installed at Valhall during 2003 –120 km seismic cables –2414 groups of 4C sensors –Covers 45sq km

Passive Seismic ImagingStanford Exploration Project Oyo-Geospace cable

Passive Seismic ImagingStanford Exploration Project operations

Passive Seismic ImagingStanford Exploration Project Valhall data

Passive Seismic ImagingStanford Exploration Project Valhall data 3 days, C recievers 1.2 Tbytes

Passive Seismic ImagingStanford Exploration Project Valhall data trace # Depth slice near 88m energy localized around rig moveout across traces suggests surface noise

Passive Seismic ImagingStanford Exploration Project Valhall data Reflector? mono-freq. boat noise rig activity

Passive Seismic ImagingStanford Exploration Project Valhall pipe cut normalization 4km 12km

Passive Seismic ImagingStanford Exploration Project Valhall pipe cut image 4km 12km

Passive Seismic ImagingStanford Exploration Project Valhall active seismic 4km 12km

Passive Seismic ImagingStanford Exploration Project thank you

Passive Seismic ImagingStanford Exploration Project Valhall pipe cut image 4km 12km