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Speaker: Vladimir Grechka, Borehole Seismic 

Gyration tensors, quantifying shapes of static populations of points distributed in 3D space, are extended to dynamically varying populations, providing a tool for analysis of their spatiotemporal evolution. Computing gyration tensors for hypocenters of microseismic events associated with hydraulic fracturing allows us to examine the behavior of populations of ruptures represented by the events rather than the behavior of individual ruptures, as conventionally implemented in microseismic monitoring. Synchronization of microseismic and completions data yields further advantages, making it possible to directly observe how changes in stimulation parameters, primarily the slurry rate and proppant concentration, govern the locations of ruptures, either spreading them laterally in a stimulated formation or pushing them out of zone. 

After introduction to the theory of gyration tensors and ellipsoids, we discuss several case studies from the Permian Basin in the West Texas, illustrating potential uses of gyration for completions optimization. 

Speaker Biography: Vladimir Grechka, Borehole Seismic
Vladimir Grechka received an MSc degree (1984) in geophysical exploration from Novosibirsk State University, Russia, and a PhD (1990) in geophysics from the Institute of Geophysics, Novosibirsk, Russia. In 1995, Vladimir joined the Department of Geophysics at Colorado School of Mines, where he was an associate research professor and a co-leader of the Center for Wave Phenomena. From 2001 to 2012, Vladimir was a senior staff geophysicist at Shell, and from 2012 to 2019 a senior technical consultant at Marathon Oil. Since 2019, Vladimir has been a senior adviser at Borehole Seismic, focusing on novel uses of microseismics and VSP for reservoir characterization and monitoring. He published five books and over 400 technical papers. Vladimir teaches courses on seismic anisotropy for SEG and EAGE. 

 
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