A comparison of results from two different flash pyrolysis methods on a solid bitumen sample

作者:Zhang Zhirong*; Hu Wenxuan; Song Xiaoying; Zhang Caiming; Zhang Qu; Jin Juchang
来源:Organic Geochemistry, 2014, 69: 36-41.
DOI:10.1016/j.orggeochem.2014.01.019

摘要

A Cambrian solid bitumen from northwestern Sichuan Basin, southern China was analyzed using two different flash pyrolysis methods coupled with gas chromatography-mass spectrometry analysis, including Pyroprobe (R) and analytical laser micropyrolysis. Results show that pyrolysis products from a Pyroprobe (R) (model 5000) analysis are dominated by mono-, di- and tricyclic aromatic hydrocarbons, whilst those from laser micropyrolysis are dominated by aliphatic hydrocarbons (n-alk-1-ene/n-alkane doublets), which is consistent with the results from an FT-IR spectrum of the solid bitumen. According to the molecular compositions of the pyrolysates from two types of pyrolysis, results from a 532 nm continuous wave laser may be more suitable for pyrolysis research of bitumen/asphaltene. Thus, differences in pyrolysis techniques must be considered when used to characterize oil asphaltenes or source rock kerogens.