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Tuesday, February 13 2018

11:30 AM - 1 PM
Tuesday, Feb 13, 2018 11:30 a.m.

Time-lapse seismic reservoir monitoring: Recent advances and the road ahead


Time-lapse seismic imaging of the earth's interior, and the estimation of time-varying changes in rock and fluid properties, has produced many spectacular results over the past 25 years; however we are still making many approximations, and extracting only a small percentage of the information available in the data. I will present new concepts in full wavefield imaging and inversion with application to active-source 4D seismic, in addition to passive seismic, ambient seismic noise, and the potential for near real-time seismic imaging.

Semi-permanent Large N sensor arrays capable of long-term continuous recording are bringing new ideas and science together from the exploration and earthquake seismology communities. I will discuss how advanced wave-equation imaging and inversion methods can be applied to continuous array data including natural and induced seismicity, and ambient noise wavefields. In some cases we are able to achieve ambient noise image convergence at reservoir depths in less than 60 minutes of recording time, which allows the possibility to make time-lapse movies of the subsurface with a frame rate of about 1 hour. Since these passive seismic arrays have a small environmental footprint and require no manmade source energy, we may be heading for a future of low-cost real-time monitoring of the subsurface using natural ambient seismic noise that is continuously generated and scattered within the earth.