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- W2017009445 abstract "Summary The potential economic benefits of passive seismic monitoring motivated us to investigate whether continuous recordings could complement conventional 4D surveys in capturing subsurface changes during production. One example of such a change is the velocity drop in the steaming zone in reservoirs subjected to CSS (Cyclic Steam Stimulation), a phenomenon that has been studied by conventional active time-lapse analyses. In a two-month passive seismic monitoring experiment conducted during the first steam cycle of a CSS pad at Cold Lake, we observed a decrease in velocity by combining noise interferometry and velocity tomography. Using continuously recorded ambient noise as our input, we applied noise interferometry to retrieve pseudo commonsource gathers along a receiver string in a borehole. These gathers retrieved from noise data collected before and after the injection serve as pseudo base and monitor surveys. We measured direct arrivals between receiver pairs in each pseudo survey and used a tomography algorithm to invert for the velocity profile along the receiver line. We observe an average 15% velocity drop above the reservoir interval and a 33% drop within the reservoir interval through the stimulation cycle. The same methodology was also applied to noise recorded at the surface but failed to produce meaningful information about subsurface changes." @default.
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- W2017009445 date "2009-01-01" @default.
- W2017009445 modified "2023-10-14" @default.
- W2017009445 title "Application of noise interferometry to obtain time‐lapse velocity variations during a steam stimulation cycle at Cold Lake" @default.
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- W2017009445 doi "https://doi.org/10.1190/1.3255171" @default.
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