Abstract
Distributed Acoustic Sensing (DAS) is gaining vast popularity in the industrial and academic sectors for a variety of studies. Its spatial and temporal resolution is ever helpful, but one of the primary benefits of DAS is the ability to install fibers in boreholes and record seismic signals in depth. With minimal operational disruption, a continuous sampling along the trajectory of the borehole is made possible. Such resolution is highly challenging to obtain with conventional downhole tools. This review article summarizes different seismic uses, passive and active, of downhole DAS. We emphasize current DAS limitations and potential ways to overcome them.
Highlights
We review various applications of downhole Distributed Acoustic Sensing (DAS), in which fibers deployed in wells record high-resolution seismic signals at depth
A recent study [70] shows that deploying fibers through a wireline in a vertical borehole can yield high-quality data given that the fiber tension is chosen to maximize signal-to-noise ratio (SNR)
The quality of recorded DAS data allows for active seismic imaging in the vicinity of the reservoir
Summary
The deployment of downhole receivers can, for targets at typical depths of several km, alleviate these limitations at the expense of limiting the subsurface volume that is well illuminated by the data They have been used, among others, for high-resolution seismic property estimation [4], microseismic monitoring during hydraulic stimulation [5], and earthquake seismology [6,7]. We review various applications of downhole DAS, in which fibers deployed in wells record high-resolution seismic signals at depth. The distance virtual receiver the laser interrogator is known treatment and calibration as the fiber properties, casing, and installation method ca with high accuracy, but their actual physical locations need to be inferred from the well fluence it [31,48,49,50].
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