Synthetic Modelling Of A DAS Cable’s Sensitivity And Performance In Microseismic Monitoring Applications

We assume two DAS cable geometries of 300 recording channels that replicate the Oseberg PRM (seafloor array) and a deviated well (akin to that used in hydraulic fracturing). We calculate the longitudinal strain at each channel, subject to the amplitude relationships described by Kuvshinov (2016), for P-waves and a coupled-cable to-medium case. The DAS cable’s sensitivity across the medium is investigated for differing wrapping angles of helical fibre. We then test how a 3D event location performs in these scenarios and create probability density estimates of the mislocations. These findings and the future implications for DAS as a viable microseismic monitoring technique are then discussed.