Stanford Exploration Project Passive Seismic Imaging passive seismic

Stanford Exploration Project Passive Seismic Imaging passive seismic imaging Brad Artman

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

Stanford Exploration Project Passive Seismic Imaging 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

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

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

Stanford Exploration Project Passive Seismic Imaging ambient noise r 1 r 2 r 1 t r 2

Stanford Exploration Project Passive Seismic Imaging ambient noise r 1 r 2 r 1 t r 2

Stanford Exploration Project Passive Seismic Imaging ambient noise r 1 r 2 r 1 t r 2

Stanford Exploration Project Passive Seismic Imaging ambient noise r 1 r 2 r 1 t r 2 r 1 r 1 r 2 lag

Stanford Exploration Project Passive Seismic Imaging ambient noise r 1 r 2 r 1 t r 2 r 1 r 1 r 2 twt

Stanford Exploration Project Passive Seismic Imaging ambient noise r 1 r 2 r 1 t r 2 r 1 r 1 r 2 twt

Stanford Exploration Project Passive Seismic Imaging backscattered PP r 1 r 2 r 1 t r 2 r 1 r 1 r 2 twt

Stanford Exploration Project 1200 0 0 position(m) 600 Passive Seismic Imaging 0 offset(m) 100 200 300 400 0. 1 5 0. 3 time(s) lag(s) 10 20 25 30

Stanford Exploration Project 1200 0 0 position(m) 600 Passive Seismic Imaging -100 offset(m) 0 100 200 300 0. 1 5 0. 3 time(s) lag(s) 10 20 25 30

Stanford Exploration Project 1200 0 0 position(m) 600 Passive Seismic Imaging offset(m) -200 -100 0 100 200 0. 1 5 0. 3 time(s) lag(s) 10 20 25 30

Stanford Exploration Project 1200 0 0 position(m) 600 Passive Seismic Imaging offset(m) -300 -200 -100 0 0. 1 5 0. 3 time(s) lag(s) 10 20 25 n long traces 2 n short traces 100 30

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

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

Stanford Exploration Project Passive Seismic Imaging 2 D Experiment 1 Receiver line

Stanford Exploration Project Passive Seismic Imaging Break Point?

Stanford Exploration Project Passive Seismic Imaging Whole Data Volume

Stanford Exploration Project Passive Seismic Imaging 8 Consecutive Lines

Stanford Exploration Project Passive Seismic Imaging 8 Spaced Lines

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

Stanford Exploration Project Passive Seismic Imaging active synthetic reflection gather active migration

Stanford Exploration Project Passive Seismic Imaging passive synthetic correlated passive gather passive migration

Stanford Exploration Project Passive Seismic Imaging passive synthetic correlated passive gather passive migration

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

Stanford Exploration Project Passive Seismic Imaging 2. 5 D Vapp = V/cos(f)

Stanford Exploration Project Passive Seismic Imaging earthquake energy

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

Stanford Exploration Project Passive Seismic Imaging Artman Geo. Services

Stanford Exploration Project Passive Seismic Imaging Enlarged data set

Stanford Exploration Project Passive Seismic Imaging 5 min Night

Stanford Exploration Project Passive Seismic Imaging 5 min Night

Stanford Exploration Project Passive Seismic Imaging 10 min Day

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

Stanford Exploration Project Passive Seismic Imaging Valhall • • • one of the North sea giant fields partners Amerada Hess, Shell and Total reservoir highly porous chalk first production 1982 field life 2028

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

Stanford Exploration Project Passive Seismic Imaging Oyo-Geospace cable

Stanford Exploration Project Passive Seismic Imaging Valhall data

Stanford Exploration Project Passive Seismic Imaging Valhall data 3 days, 2300 4 C recievers 1. 2 Tbytes

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

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

Stanford Exploration Project Passive Seismic Imaging Valhall pipe cut image 12 km 4 km

Stanford Exploration Project Passive Seismic Imaging Valhall active seismic 12 km 4 km

Stanford Exploration Project Passive Seismic Imaging thank you