Wave equation moment tensor inversion of microseismic events using multiwell distributed acoustic sensing recording

• DOI: 10.1190/geo2024-0246.1
• Publication Date: 2025-02-04T15:58:55Z
• Authors: Eyal Shimony; Ariel Lellouch
• Keywords: Microseism; Moment tensor

The directional nature of Distributed Acoustic Sensing (DAS) measurements can limit their usefulness for moment tensor estimation, which is traditionally inverted using multi-component sensors. However, we show that inversion DAS data acquired in a dual-well microseismic monitoring scenario yield reliable estimations all components. Our approach based on the adaptation linear waveform method, utilizing 3-D anisotropic viscoelastic Green's functions, to data. We estimate tensors 20 events recorded at Hydraulic Fracturing Test Site II (HFTS2) site after relocation and velocity model updates. observe very good match between field synthetic generated tensors. Accurate event locations reasonable models are important successful inversion. Resolution analysis each component, taking into account influence array noise-dependent uncertainty, shows unidirectional recording not limiting factor this acquisition geometry. Noise unevenly influences uncertainty different components, but most them remain resolvable even with low signal-to-noise ratio. horizontal parts contribute mostly M xx , yy xy whereas vertical zz yz xz . resolution methodology scale-independent be used study alternative geometries configurations or seismological studies.