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Characterization of petroleum source rocks by pyrolysis-mass spectroscopy gas evolution profiles

机译：利用热解 - 质谱气体演化剖面表征石油烃源岩

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The gas evolution profiles form pyrolysis of 38 oil shales, coals, and petroleum source rocks and an asphaltene sample have been measured by mass spectrometry. The experiments used a Pyromat II kinetic analyzer interfaced to a VG Micromass residual gas analyzer. The cracking patterns of a few simple gas standards were measured to calibrate the contributions of various species to different masses, and a simple procedure was developed to estimate the relative concentrations of methane and ethane from linear combinations of two masses. The samples were heated from 250 to 650 (degrees) C at 25 (degrees) C/min in flowing helium. The resulting evolution profiles agree well with those measured previously on some of the same samples by pyrolysis-infrared spectrometry and pyrolysis-tandem mass spectrometry. The temperature of maximum, evolution rate (T (sub max)) of individual hydrocarbon gases form lacustrine source rocks is typically the same as for total hydrocarbons while the T(sub max) values of methane and ethane from marine source rocks and coals are usually significantly higher than for the total hydrocarbons. However, a crossplot of Rock-Eval T(sub max) with methane T (sub max) indicates that most Norwegian source rocks investigate fall in a different category than other Type I and Type II source rocks examined.

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