Case Study/ 40 Nodes. 6,000 m Depth. 519 Events. What Can Surface Monitoring Achieve?
Jul 28,2026
DAS has proven to be a powerful technology for deep reservoir monitoring, offering dense spatial sampling and continuous downhole measurements.
However, real field conditions are not always ideal. Not every project has fiber infrastructure, dedicated monitoring wells, or the budget for large-scale downhole deployment.
So the question is:
What can we achieve with 40 surface seismic nodes when monitoring a reservoir at 6,000 m depth?
In the DN2-B2 carbonate reservoir project, 40 UGL-3C three-component seismic stations were deployed for surface microseismic monitoring during nitrogen injection.
Despite challenging conditions, including deep burial depth, strong attenuation, weak signals, and no fiber infrastructure, the system successfully recorded 519 microseismic events during 78 hours of continuous monitoring.
Using QuakeView processing, the detected events revealed a clear NE–SW dominant migration direction, consistent with the regional geological structure.
Key results:
• Swept length: ~1,598 m
• Swept area: 5.89 × 10⁴ m²
• Swept volume: 2.71 × 10⁵ m³
• NE front extension: 400–500 m
• SW front extension: 300–400 m
This case demonstrates that surface microseismic monitoring, when combined with optimized array design and advanced processing workflows, can provide valuable reservoir insights — even at 6,000 m depth.
DAS remains an excellent solution when infrastructure and project conditions allow. But in many real-world scenarios, a flexible and cost-effective surface array can also deliver meaningful geological information.
Sometimes, the best monitoring solution is not the one with the highest channel density — it is the one that fits the project reality.
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