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Abstract

Summary

Distributed Acoustic Sensing is a seismic acquisition technology with the promise to lower costs and increase coverage and density of sampling. Curved fibres (e.g., helical-wound) furthermore enable both a mitigation of the well-known broadside insensitivity issue and in principle the local measurement of vector displacement and/or tensor strain. We introduce a parameterization of a helical fibre wound about an arbitrarily curved cable axis, considering in particular the case of a helix wound about another helix, introducing a naming convention involving an “n-helix”. We illustrate the possible benefits of a fibre wound into a 2-helix with plots of tangents on the unit sphere. Within this model we generalize the broadside insensitivity relationship, by considering projections of P-wave strain onto the enumerated tangents of shaped fibre.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.201701202
2017-06-12
2024-04-19

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References

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201701202
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Parameterization of a Helical DAS Fibre Wound about an Arbitrarily Curved Cable Axis
Conference Proceedings 2017, 1 (2017); https://doi.org/10.3997/2214-4609.201701202
/content/papers/10.3997/2214-4609.201701202
/content/papers/10.3997/2214-4609.201701202
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