Distributed acoustic sensors (DAS) using fiber optic cables is an emerging acquisition technology for O&G industry. It offers the advantage of improving seismic acquisition by massive monitoring of seismic waves at reduced cost. In this paper we show that, as a result of the dense spatial distribution of recording points along the optic cable, DAS can provide two field components in the axial direction, even when using a single one-dimensional line. These signal pairs consist of dual components, which are related to strain and particle velocity fields at a given recording location. We show with real examples where the data can be combined to provide separation of up- and down-going wavefields. The ratio of the dual components provides information on local slowness properties in the formation.

Dual seismic fields from distributed acoustic sensors

Corubolo P;Farina B;
2014

Abstract

Distributed acoustic sensors (DAS) using fiber optic cables is an emerging acquisition technology for O&G industry. It offers the advantage of improving seismic acquisition by massive monitoring of seismic waves at reduced cost. In this paper we show that, as a result of the dense spatial distribution of recording points along the optic cable, DAS can provide two field components in the axial direction, even when using a single one-dimensional line. These signal pairs consist of dual components, which are related to strain and particle velocity fields at a given recording location. We show with real examples where the data can be combined to provide separation of up- and down-going wavefields. The ratio of the dual components provides information on local slowness properties in the formation.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.14083/5096
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