Improving the acquisition efficiency of acquiring borehole seismic data by recording optical distributed acoustic data on a wireline hybrid electrooptical cable

Borland, William H.; Hearn, Richard; Sayed, Ali

doi:10.1190/segam2016-13951115.1

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…In a borehole, the fibre is often cemented inside the casing, in order to increase the coupling with the borehole. There are also various recordings where a temporarily installed wireline cable was used (Hartog et al 2014;Borland et al 2016;Yu et al 2016). Here the fibre is not properly coupled, meaning it has a certain degree of freedom to move around.…”

Section: Introductionmentioning

confidence: 99%

Continuous monitoring of the depth of the water-mud interface using distributed acoustic sensing

et al. 2022

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Purpose Current surveying techniques used by port authorities to estimate the nautical depth are limited in depth resolution and temporal resolution. Because of this, certain heavily occupied quay walls cannot be optimised in terms of utilisation. Therefore, a permanent continuous measuring system with a higher depth resolution is needed to optimise the occupation at these quay walls. We show how this could be achieved with distributed acoustic sensing (DAS) using fibre-optical cables. Materials We analyse recordings from a dual-frequency echo-sounder source along a standard communication optical fibre coiled vertically around a PVC pipe to represent vertical seismic profiling. This PVC pipe is placed inside a transparent plastic cylindrical tank which is partly filled with water and mud. This allows us to track the water-mud interface visually. We use a Silixa iDAS v2 and a Febus A1 DAS interrogator to convert the optical fibre into a seismic sensor. We use a wave generator to select the source frequency and an amplifier to amplify the output of the wave generator to a SIMRAD 38/200 COMBI C dual-frequency echo-sounder. Results We identify standing waves and use them to make accurate depth estimates of the water-mud interface inside the column we measure. Due to the high apparent velocity, the standing waves are easy to identify in the time domain. Due to the constructive interference, standing waves also show the water-mud interface in a power spectral density plot. We demonstrate that these standing waves could be used with an on-demand permanent continuous measuring system using ambient noise sources. Conclusion Our laboratory experiment showed that DAS could be used to estimate the water-mud interface. In addition, we showed the potential for on-demand monitoring in ports and waterways using DAS. Furthermore, due to the low cost of optical fibres, and the possibility of utilising ambient noise sources, DAS could be used for continuous depth monitoring purposes in ports and waterways.

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Section: Introductionmentioning

confidence: 99%

Continuous monitoring of the depth of the water-mud interface using distributed acoustic sensing

et al. 2022

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“…However, there are a significant number of drilled wells in which only the use of wireline DAS technology is possible. Nevertheless, only a limited amount of data examples recorded using temporarily installed wireline cable are available (Hartog et al ., 2014; Borland, Hearn and Sayed, 2016; Yu et al ., 2016a; Yu et al ., 2016b; Willis et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

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

Martuganova

Stiller

Bauer

et al. 2021

Geophysical Prospecting

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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 Gabor atoms and (2) subtracting the noise model for imaging improvement. The matching pursuit method focuses on decomposing the original input signal into a weighted sum of Gabor functions. Analysing Gabor atoms properties for frequency, amplitude and position in time provides the opportunity to distinguish parts of the original signal denoting noise caused by the vibrating cable. The matching pursuit decomposition applied to the distributed acoustic sensing‐vertical seismic profiling data at the geothermal test site Groß Schönebeck provides a versatile processing instrument for noise suppression.

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A Literature Review

Li¹,

Karrenbach²,

Ajo‐Franklin³

2021

Geophysical Monograph Series

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Improving the acquisition efficiency of acquiring borehole seismic data by recording optical distributed acoustic data on a wireline hybrid electrooptical cable

Cited by 8 publications

References 3 publications

Continuous monitoring of the depth of the water-mud interface using distributed acoustic sensing

Continuous monitoring of the depth of the water-mud interface using distributed acoustic sensing

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

A Literature Review

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