Abstract
In this work, crude oil characterization based on surface plasmon resonance (SPR) is demonstrated. Oil characterization plays a crucial role in both the upstream and downstream oil industry. The application of SPR to these opaque, high index fluids is made possible here using infrared light (λ = 1550 nm) for which crude oil is largely transparent, coupled through a high-index prism. Bitumen–toluene mixture tests show a measurement sensitivity of 74° RIU–1 and a limit of detection below 1% toluene. Seven crude oils from around the world are differentiated with refractive indices (RIs) spanning 1.44–1.56, with a sensor limit of detection of 0.0006 RIU. These results indicate a significant potential for SPR as a non-intrusive, fast, and simple technique for crude oil characterization applicable to reservoirs, surface facilities, and pipelines.
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