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Dynamic monitoring of liquid–gas migration in underground reservoirs using distributed fiber optic strain sensing and X-ray computed tomography
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蒋
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DOI：10.1016/j.jrmge.2026.03.070.png)
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Abstract
En 中文
Reliable monitoring is essential for safe and efficient geological CO2 storage. Distributed fiber optic strain sensing (DFOSS) enables continuous, high-resolution measurements of reservoir deformation and offers a pathway to infer fluid migration; however, practical application is hindered by the lack of robust analytical methods for tracking the displacement front. Here, DFOSS was coupled with X-ray computed tomography (CT) in dynamic core-flooding experiments to quantify the relationship between micro-deformation and internal liquid–gas displacement. A DFOSS-based front-detection method was developed and validated against CT-derived front positions. The strain response systematically precedes the advance of the fluid front, indicating a measurable poromechanical precursor driven by hydromechanical traction. Compared with conventional fixed-threshold criteria, the proposed method remains stable at low injection rates where hydraulic and mechanical effects are strongly coupled. Across all tested conditions, the predicted front positions agree with the X-ray observations. In addition, a negative strain-acceleration signature localized near the front provides a quantitative feature for poromechanical modeling of front-induced deformation. Using an N2KI displacement system to minimize dissolution effects, this study demonstrates DFOSS as a robust tool for tracking gas–liquid migration and deformation evolution, enabling near-wellbore stability assessment through deformation-based criteria for safer CCUS operations.
Keywords:
Geological sequestration
Distributed fiber optic strain sensing (DFOSS)
Monitoring technology
Liquid-gas front detection
Poromechanics
Reservoir dynamics
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10.2
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