FIBER OPTIC SYSTEM borehole seismic measurements based on Rayleigh backscatter

摘要

1. microseismic monitoring system, comprising: an optical fiber disposed in the wellbore; wherein the optical fiber runs along a curved path to provide azimuthal sensitivity for microseismic events borehole, the light source that excites the optical fiber and at least one light sensor, which analyzes the light backscattered Rayleigh for receiving acoustic signals for each of the plurality of points along the trunk well; a processor that determines the distance, direction or intensity of microseismic events at least partially on the basis of phase information of said acoustic signals and skvazhiny.2 barrel. The system of claim. 1, wherein within said determining processor performs cross-correlation of at least two of said acoustic signalov.3. The system of claim. 1, wherein within said determining processor performs conversion of said acoustic signal in the spatial and frequency oblastyah.4. The system of claim. 1, wherein within said determining processor performs Radon transform for said acoustic signalov.5. The system of claim. 1, wherein within said determining processor performs beamforming for said acoustic signalov.6. System according to any one of claims. 1-5, wherein the processor determines the azimuth of the microseismic event at least partially based on said phase informatsii.7. System according to any one of claims. 1-5, wherein said sensor provides distributed from