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BAGS Seminar – Dr. Chris Sherman
Title: Building a geomechanical framework for interpreting DAS measurements
Date and Time: 5.21.2018 and 3-4pm
The development of distributed fiber-optic acoustic sensor (DAS) technology has produced a massive source of new data that has the potential for monitoring processes in the subsurface, such as geothermal energy production or hydraulic fracturing. DAS is designed to measure strain (or strain rate) at a high spatial and temporal resolution over large distances, using the fiber itself as a sensor. Because of its relative novelty to the geophysical community, a robust and quantitative framework for interpreting these data is currently lacking. In our work, we use a massively parallel geomechanics code to generate synthetic DAS measurements, directly relate them features observed in the models, and develop strategies for interpret the equivalent field data. Because this approach is numerical, we are also able to design and evaluate the effectiveness of new acquisition geometries.
Dr. Sherman received his PhD from UC Berkeley in 2015, and is now a staff scientist at Lawrence Livermore National Laboratory. His current research interests include computational geophysics, induced microseismicity, and fiber-optic distributed acoustic sensor (DAS) technology.