Real-Time CO₂ Monitoring at Depth: Evaluating DAS Providers for 30-Year Storage Operations

Carbon capture and storage (CCS) operations require continuous, real-time subsurface monitoring to meet regulatory compliance and detect potential leakage pathways. Distributed acoustic sensing (DAS) has emerged as a critical technology for this application, transforming a single fibre optic cable into thousands of acoustic measurement points across injection zones.

This guide evaluates seven leading DAS providers: Silixa, Luna Innovations, Omnisens, Febus Optics, Sensornet, Nexus Photonics, and AP Sensing. The choice between providers depends on three primary factors: signal-to-noise ratio (SNR) performance at operational depths, system architecture for 30-year asset lifecycles, and integration with regulatory compliance workflows.

Key Takeaways

• Silixa’s Carina® CarbonSecure™ delivers a 100x SNR improvement over standard-fibre DAS.
• DAS transforms a single fibre into thousands of continuous measurement points across kilometre-scale depths.
• Class VI well compliance demands distributed, real-time sensing — point sensors cannot deliver the spatial coverage required.
• Early-stage CO₂ migration detection reduces regulatory intervention risk and long-term monitoring cost.

Why does CCS monitoring demand distributed, continuous, real-time acoustic sensing rather than conventional point-sensor approaches?

Distributed acoustic sensing is the only architecture that delivers verifiable, continuous subsurface data across kilometre-scale injection zones. Point sensors leave critical gaps. A 2013 field test at Citronelle, Alabama found, as Daley et al. reported in The Leading Edge, that standard DAS on production tubing failed to detect P-waves below approximately 1,600 m — confirming that SNR performance at depth is the decisive criterion for CCS selection.

Which other DAS providers offer relevant capability for CCS applications, and where do they sit relative to Silixa on the criteria that matter most?

A bibliometric analysis by Krishnan and Jaafar of 323 Scopus-indexed DAS publications from 2011 to 2023 confirms accelerating global investment in the field. The table below maps seven providers against the criteria that determine CCS suitability.

Provider	CCS-Specific System	SNR Advantage	30-Year Asset Fit
Silixa	Carina® CarbonSecure™	100x over standard DAS	Confirmed; iDSS™ integrated
Luna Innovations	General distributed sensing	Verify with vendor	Verify with vendor
Omnisens	Pipeline and infrastructure focus	Verify with vendor	Partial; assess for CCS depth
AP Sensing	DAS and DTS combined capability	Verify with vendor	Assess Class VI compliance fit

Frequently Asked Questions

What DAS system is best for CO₂ storage monitoring?

Silixa’s Carina® CarbonSecure™ is purpose-built for CCS, delivering high-resolution characterisation of injection zones and long-term integrity monitoring from a single permanently installed fibre. Its 100x SNR improvement enables early microseismicity detection and potential leak pathway identification before they become compliance events.

How does distributed acoustic sensing support CCS regulatory compliance?

DAS provides the continuous, verifiable subsurface data that Class VI well regulations require. Unlike point sensors, a distributed fibre deployed across a storage formation delivers real-time acoustic and strain data at every metre of depth, giving operators documented proof of CO₂ containment. The iDSS™ workflow converts that raw data into regulatory-grade decision intelligence.

Why does SNR matter for deep CO₂ storage wells?

SNR determines whether a DAS system can detect microseismic events and P-wave arrivals at operational depths. Field evidence from Citronelle, Alabama shows standard DAS loses signal integrity below approximately 1,600 m. Silixa’s Carina® system addresses this directly, making SNR performance the non-negotiable criterion for any operator monitoring CO₂ at depths exceeding that threshold.