Geology

Image (mathematics)

Regional geology

Wireless

Noise (video)

Computer science

Acoustics

Tectonics

Signal processing

Computer vision

Telecommunications

Filter (signal processing)

Artificial intelligence

Seismology

Radar

Ringing

Physics

Wireline

Metamorphic petrology

Geophysical Prospecting

The application of distributed acoustic sensing in borehole measurements allows for the use of fibre optic cables to measure strain. This is more efficient in terms of time and costs compared with the deploying of conventional borehole seismometers. Nevertheless, one known drawback for temporary deployment is represented by the freely hanging wireline cable slapping and ringing inside the casing, which introduces additional coherent coupling noise to the data. The present study proposes an explanation for the mechanism of noise generation and draws an analogy with similar wave propagation processes and phenomena, such as ghost waves in marine seismics. This observation allows to derive a ringing noise filter function, to study its behaviour and to consider known effects of the gauge length filter. After examining existing methods aimed at eliminating ringing noise and results of their application, we propose a two‐step approach: (1) developing a denoising method based on a matching pursuit decomposition with ...

Cable reverberations during wireline distributed acoustic sensing measurements: their nature and methods for elimination