Fracture Imaging Using DAS-Recorded Microseismic Events

Hydraulic fracturing enables hydrocarbon production from unconventional reservoirs. Mapping induced seismicity around newly created fractures is crucial for understanding the reservoir response and increasing efficiency of operations. Distributed acoustic sensing (DAS) provides a large amount high spatial resolution microseismic data acquired along entire length horizontal wells. We focus on observed reflected S-waves develop new methodology using events as sources energy to image acting reflectors in media surrounding monitoring fiber. The workflow consists DAS preprocessing, event location, wavefield separation, raytracing-based imaging, post-processing. comparison resulting images with low-frequency signals fracture hits corroborates that reflections are by stimulation. proposed algorithm can be used real-time mapping tracking changes space time. Fracture imaging leads better hydraulic