【作者】 李振广； 秦匡宗；

【Author】 Li zhenguang Research Institute of Exploration and Development,Daqing oilfield 163712 Qin kuangzong University of Beijing、PRC、100083

【机构】 大庆石油管理局勘探开发研究院； 石油大学；

【摘要】 用常规固体高分辨谱和偶级相移谱(DD)分析研究了大庆油田不同类型低成熟干酪根的结构特征。偶级相移谱提供了干酪根新的结构参数、如芳烃率、脂碳率和芳碳部分的氢碳原子比等。在DD谱中(T=40μs)Ⅰ型干酪根中脂碳柔性可动和链亚甲基与次甲基峰为主,而在Ⅲ型干酪根中则以甲基碳信号为主。更多还原

【Abstract】 Solid state ¹³C nuclear magnetic resonance spectroscopy with cross poiarization（CP）、magic angle spinning（MAS） and dipolar dephasing（DD）techniques were used to study the different type kerogens from Daqing oil field. The DD NMR spectrum provides new structural parameters of kerogen such as hydrogen aromaticity,.hydrogen carbon atomic ratio of the aliphatic and aromatic parts.In the DD spectra（t=40us）、the resonance band due to methylene and methine carbons.with segmental motion（23.3-34ppm）is the dominant for type I kerogens,while mobile methyl carbons（0-23.5ppm）dominate the aliphatic bandof typeⅢkerogens. Aliphatic carbons are further distinguished into five sub-groups,mainly assigned as methyl carbons,acylic and cyclic methylene and methine carbons,alpha and quaternary carbons,oxygen bonded carbons. Each of them has been correlated with the amount of hydrocarbon potential S measured by Rock-eval tests.The results revealed that acyclic methylene and methine carbons give the best correlative coefficient of 0.959,cyclic methylene and methine carbons 0.929,methyl carbons 0.893,alpha and quaternary carbons 0.847 and oxygen bonded carbons the least. It is concluded that methylene and methine groups are the most active matrix in the hydrocarbon generation of kerogen.更多还原