Case Study of Dual-Signal Processing of DAS-VSP Vibrator Data From a 3D Survey in a Geothermal Reservoir

Date

2025-09-01

Author

Poletto, Flavio
Bellezza, Cinzia
Böhm, Gualtiero
Meneghini, Fabio
Chalari, Athena
Stork, Anna
Parlaktuna, Mahmut
Şentürk, Erdinç
Draganov, Deyan
van Otten, Gijs
Durucan, Sevket

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The three-dimensional (3D) distributed acoustic sensing (DAS) vertical seismic profile (VSP) technique is an effective tool to characterize subsurface reservoirs, enabling the use of large and densely sampled borehole receiver arrays with many surface vibrator source points for onshore time-lapse monitoring. However, the processing of the DAS VSP signals for imaging purposes is based on a reliable wavefield separation, which may depend on the recognition and quality of the direct arrivals. To overcome this limitation for common-source gathers with poor signal-to- noise ratio or with interferences, we apply the dual-signal processing method, which allows us to estimate and separate the DAS wavefields by signals' combination without arrival picking. We present a case study of a 3D VSP DAS dataset recorded at a geothermal reservoir in Turkey, showing that the method, similar to a geophone and hydrophone combination, is robust and effective and can be advantageously integrated with the conventional processing. Supported by signal benchmarking, modelling and signal-to-noise ratio analysis, we treat common-source and common-receiver data. Our analysis shows the advantages and limitations of the proposed approach, valuable in the time-lapse perspective.

Subject Keywords

distributed acoustic sensing, dual signals, geothermal reservoir, three-dimensional vertical seismic profile, vibrator source

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105015967824&origin=inward
https://hdl.handle.net/11511/115879

Collections

Department of Petroleum and Natural Gas Engineering, Article