Gas-detection technology improves reservoir interpretation

New developments in gas-detection technologies, including high-speed chromatographs and microwave ovens, provide mud loggers and operators with improved means for reservoir interpretation.The current perception of mud logging is that because of built-in errors in measurement, the gas-evaluation process is not sufficiently accurate or reliable for formation evaluation. For example, older systems suppress heavier gas measurements, while systems using dilution cause errors in the measurements of heavier gases (ethane through pentane) of up to 300%.Yet recently, technical improvements in the area of surface gas measurement have increased accuracy tenfold to an unprecedented level of 1-5 ppm. ...

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