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Abstract

Summary

The initial findings of a simultaneous recording of dual-well distributed-acoustic-sensing VSP acquisition demonstrates the ability of on-tubing fibre to record high-quality seismic signals down to about 4 km depth. Each shot was recorded by two fibres deployed in wells that are 1.5 km apart. A dual-fibre interrogator enables the efficient recording of a high-channel-count walkaway VSP dataset suitable for robust velocity model building. Even with high-quality casing cementation, DAS records exhibited reduced sensitivity/coupling in the shallower section requiring low-pass filtering for robust first-break picking. The corridor stacks at the two wells show an excellent tie to surface seismic and agree with the ZVSP geophone corridor stack at one of the wells. A massive ensemble of first-arrival picks enabled multi-offset traveltime inversion to reconstruct a reliable profile approaching sonic-log resolution and overcome the lower sensitivity of DAS measurement at higher angles.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.2023101437
2023-06-05
2026-04-20

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/content/papers/10.3997/2214-4609.2023101437
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Walkaway DAS VSP simultaneously acquired between two deep wells
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.2023101437
/content/papers/10.3997/2214-4609.2023101437
/content/papers/10.3997/2214-4609.2023101437
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