the white line is shown in the bottom panel.
Figure 1.35 Comparison of geophones (left panel) and DAS with engineered fiber (right panel).
The results from a VSP survey in a carbon sequestration well (Correa et al., 2017) demonstrate that DAS with engineered fiber has the potential to provide similar, or even superior, quality data sets as compared to conventional geophones. An important aspect is that, due to the higher spatial sampling, DAS data has the capability to provide more detailed velocity information as compared to geophones. This conclusion was expected from the preceding theory and is illustrated in Figure 1.35, which demonstrates even a finer reflection structure from DAS than from geophones.
In summary, we have estimated the main DAS performance parameters for standard and engineered fiber and provided field data that correspond to the theoretical predictions of improved sensitivity and dynamic range.
ACKNOWLEDGMENTS
The authors would like to thank Roman Pevzner and Valeriya Shulakova (of CO2CRC, Curtin University) and Thomas M. Daley, Barry M. Freifeld, Jonathan Ajo‐Franklin, and Shan Dou (of the Lawrence Berkeley National Laboratory) for the use of raw and processed surface seismic data and the presented field geometry. The authors would also like to acknowledge the significant help and support from their colleagues at Silixa. In addition, the authors thank the reviewers for their helpful comments in preparing this manuscript.
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