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- W4362654501 abstract "Fluids injected during hydraulic fracturing (fracking) in unconventional shale oil and gas reservoirs, geothermal system enhancement, wastewater disposal, and carbon capture and storage can induce microearthquakes. The spatiotemporal distribution of induced earthquakes is often used to trace the growth of fractures in target layers and guides production. We analyze microseismicity behavior induced by fracking in the Montney Formation, one of the largest unconventional oil and gas reservoirs in North America. An optical fiber deployed in a horizontal well provides extensive spatial sampling and data coverage for microseismic imaging. We design median and F-k filters to predict instrumental and random noise and further suppress them by adaptive noise subtraction. An elliptical vertical transverse isotropic (VTI) velocity model is derived from the Backus-averaged well-log sonic data and is modified to match the microseismic wavefronts by a grid search. We image 41 previously cataloged microearthquakes recorded by DAS using Geometric-mean Reverse Time Migration. We find that the fiber geometry’s lack of 2D/3D variations increases the non-uniqueness of the image point location, and the P-wave particle motions derived from 3C geophones data can effectively eliminate the location ambiguity. The spatiotemporal distribution of our updated locations agrees with the fracking schedule. Predicted P- and S-wave traveltimes from the updated locations also match with the observed waveforms. Analyzing data sensitivity to source locations confirms the potential limitations imposed on source imaging by the geometry of borehole observations and shows that relocation accuracy is directionally dependent. We also investigate the feasibility of estimating source focal mechanisms using realistic DAS and geophone observations. Our study provides guidance for characterizing microearthquake sources and optimizing observation geometry for unconventional reservoirs." @default.
- W4362654501 created "2023-04-07" @default.
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- W4362654501 date "2023-01-01" @default.
- W4362654501 modified "2023-10-16" @default.
- W4362654501 title "Characterizing Microearthquakes Induced by Hydraulic Fracturing with Hybrid Borehole DAS and Three-Component Geophone Data" @default.
- W4362654501 doi "https://doi.org/10.1109/tgrs.2023.3264931" @default.
- W4362654501 hasPublicationYear "2023" @default.
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