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For shallow injectite reservoir monitoring using narrow azimuth towed streamer data, 4D full-waveform inversion (FWI) improves production monitoring and correctly identifies two separate softening responses, which can be correlated with gas injection and gas exsolution. In addition, a previously unidentified softening response is also observed which, using well production data, may be interpreted as geo-mechanical extension in the overburden. Migration with individual velocities from 4D FWI resolves depthing issues beneath reservoirs by correctly accounting for velocity changes in the subsurface.