Dual wavefields from distributed acoustic sensing measurements

Author:

Poletto Flavio1,Finfer Daniel2,Corubolo Piero1,Farina Biancamaria1

Affiliation:

1. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale — OGS, Sgonico, Trieste, Italy..

2. Silixa Ltd, London, UK..

Abstract

Distributed acoustic sensing (DAS) using fiber optic cables is an emerging seismic acquisition technology for the oil and gas industry, geothermal resource exploration, and underground fluid-storage monitoring. This technology offers the advantage of improving seismic acquisition by enabling massive arrays for monitoring of seismic wavefields at reduced cost with respect to conventional methods. In general, it is accepted that this method provides acoustic signals comparable with conventional seismic data, however, without the multicomponent directional information typical of geophones. We have developed a modified data extraction method and found that, as a result of the dense spatial distribution of recording points along the optic cable, DAS can provide two linked wavefield components in the axial direction, even when using a single 1D cable line. These signal pairs consist of dual components that are related to native strain rate (or strain) and particle acceleration (or velocity) fields at a given recording location. These dual signals are easily usable for wavefield separation purposes simply performing a trace-by-trace combination by appropriate scaling coefficient. The analysis performed with borehole data from linear and helically wound cables demonstrates the effectiveness of polarity recovery and dual-wavefield separation. We show real examples in which the data can be combined to provide separation of up- and downgoing wavefields. The ratio of the dual components provides information on local slowness properties in the formation.

Publisher

Society of Exploration Geophysicists

Subject

Geochemistry and Petrology,Geophysics

Reference27 articles.

1. Barr, F. J., and J. I. Sanders, 1989, Attenuation of water-column multiples using pressure and velocity detectors in a water-bottom cable: 59th Annual International Meeting, SEG, Expanded Abstracts, 653–656.

2. Increased resolution and penetration from a towed dual-sensor streamer

3. Field testing of fiber-optic distributed acoustic sensing (DAS) for subsurface seismic monitoring

4. Den Boer, J. J., A. A. Mateeva, J. G. Pearce, J. J. Mestayer, W. Birch, J. L. Lopez, K. Hornman, and B. N. Kuvshinov, 2013, Detecting broadside acoustic signals with a fiber optical distributed acoustic sensing (DAS) assembly: Patent application WO 2013090544 A1.

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