Effectiveness of Fiber Optic Distributed Acoustic Sensing (DAS) in Vertical Seismic Profiling (VSP) Field Survey

The evolution of fiber optic technology in the past few decades has led to significant advancements various fields, including high-speed and long-distance communication, big data transport, optical imaging, sensing. However, relatively studies have examined use sensors (FOSs) as point distributed geophysics. Distributed Acoustic Sensing (DAS) is a widely used method for subsurface imaging monitoring wells, specifically Vertical Seismic Profiling (VSP) surveys. This allows detailed analysis structures properties reservoirs. Four different strategies deploying FOS cables DAS VSP are evaluated compared: cementing behind casing, cable inflatable liner, strapping production tubing, wireline deployment. Cementing casing considered most effective coupling with formation. other methods also their own advantages limitations. example, accessibility without affecting acoustic signal, while tubing can still record signals; noise signal attenuation from annular fluid, however, make it difficult differentiate seismic signal. Nonetheless, this benefit being simpler deploy replace case failure. Wireline deployment pick up some signals regions where touches well wall, but vertical sections not contact attenuated. Results pilot tests field Canada discussed evaluated, suggestions improving provided.