Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone
投稿时间:2018-02-22  
英文关键词:Immature–low-maturity stage, Simulated pyrolysis experiment, Bicyclic sesquiterpanes, Thermal evolution, Maturity indicators
基金项目:This work was supported by the National Natural Science Foundation of China (Grant Nos. 41672117 and 41503034), the Hubei Provincial Natural Science Foundation of China (Project No. 2017CFA027), the Open Subject of Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral (Baojun Liu Geoscience Science Foundation) (DMSM2017084), and the Open Subject of the State Key Laboratory of Petroleum Resources and Prospecting (PRP/open-1509). We thank Zhu CS for his suggestions and his help with the GC–MS experiments.
作者单位
Gang Yan Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education, Wuhan 430100, Hubei, China
College of Resources and Environment, Yangtze University, Wuhan 430100, Hubei, China 
Yao-Hui Xu Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education, Wuhan 430100, Hubei, China
College of Resources and Environment, Yangtze University, Wuhan 430100, Hubei, China 
Yan Liu Institute of Mud Logging Technology and Engineering (Yangtze University), Jingzhou 434023, Hubei, China 
Peng-Hai Tang Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education, Wuhan 430100, Hubei, China
College of Resources and Environment, Yangtze University, Wuhan 430100, Hubei, China 
Wei-Bin Liu Oil and Gas Survey, China Geological Survey, Beijing 100029, China 
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英文摘要:
      Sesquiterpanes are ubiquitous components of crude oils and ancient sediments. Liquid saturated hydrocarbons from simulated pyrolysis experiments on immature organic-rich mudstone collected from the Lower Cretaceous Hesigewula Sag were analyzed by gas chromatography–mass spectrometry (GC–MS). C14 bicyclic sesquiterpanes, namely, 8β(H)-drimane, 8β(H)-homodrimane, and 8α(H)-homodrimane were detected and identified on basis of their diagnostic fragment ions (m/z 123, 179, 193, and 207), and previously published mass spectra data, and these bicyclic sesquiterpanes presented relatively regular characteristics in their thermal evolution. The ratios 8β(H)-drimane/8β(H)-homodrimane, 8β(H)-homodrimane/8α(H)- homodrimane, and 8β(H)-drimane/8α(H)-homodrimane all show a clear upward trend with increasing temperature below the temperature turning point. Thus, all these ratios can be used as evolution indexes of source rocks in the immature–lowmaturity stage. However, the last two ratios may be more suitable than the first ratio as valid parameters for measuring the extent of thermal evolution of organic matter in the immature–low-maturity stage because their change amplitude with increasing temperature is more obvious.
Gang Yan,Yao-Hui Xu,Yan Liu,Peng-Hai Tang,Wei-Bin Liu,2019.Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone.Petroleum Science,(3):502~512.
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