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Abstract

Summary

Laboratory measurements of elastic and anelastic properties of sedimentary rocks at seismic-frequency range are used to understand the effects of pore fluid on these properties and hence to improve quantitative interpretation of seismic data. Fibre optic distributed acoustic sensing (DAS) has a potential to substitute conventional strain gauges used for laboratory low-frequency measurements. DAS has superior sensitivity to strain as low as 10−12 and can provide measurements of strain along the full length of a sample. DAS is also robust at high temperatures up to 600°C and sensitive to ultra-low 10−3 10−2 Hz frequencies. The results of a trial experimental low-frequency measurements done on a Bentheimer sandstone with DAS confirm that fibre optics can be successfully used for such laboratory tests. DAS cable winded around a sample provides reliable measurements of strain with superior sensitivity compared to the conventionally used sensors. Additionally, using DAS for laboratory low-frequency measurements provides an opportunity to benchmark the performance of fibre optic to other strain gauges and improve understanding of the performance and applicability of DAS for both lab and field measurements.

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/content/papers/10.3997/2214-4609.202131014
2021-03-01
2024-04-26

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References

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.202131014
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Laboratory measurements of elastic properties at seismic frequencies using DAS sensors
Conference Proceedings 2021, 1 (2021); https://doi.org/10.3997/2214-4609.202131014
/content/papers/10.3997/2214-4609.202131014
/content/papers/10.3997/2214-4609.202131014
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