The foundation of downhole fluid analysis: Optical absorption spectroscopy
The InSitu Composition reservoir fluid composition sensor of the
InSitu Fluid Analyzer system employs dual spectrometers to analyze hydrocarbons, gas/oil ratio (GOR), CO
2, water content, and mud filtrate contamination across the spectrum of visible through near-infrared light. The analysis is refined with an algorithm developed from the Beer–Lambert law, which indicates that the optical absorption of a component is proportional to its concentration. Thus, the spectrum of a live oil is a weighted sum of the absorptions of its individual components.