富有机质烃源岩中显微组分分离及地球化学特征研究

Separation of macerals in organic-rich source rocks and their geochemical characteristics

许锦 张彩明 谢小敏 芮晓庆

XU Jin ZHANG Caiming XIE Xiaomin RUI Xiaoqing

1. 中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126; 2. 中国石化 油气成藏重点实验室, 江苏 无锡 214126

1. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China; 2. SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China

利用干酪根富集、液氮冷冻-室温下解冻和重液中加入乙醇等方法，解决了烃源岩中显微组分分离中存在的有机质丰度低、脆性差和亲油性强的问题，初步建立了烃源岩中显微组分的分离方法。运用该方法从云南禄劝和吉林桦甸等地区的样品中成功制备出葡萄球藻、层状藻、角质体和镜质体等单种显微组分，并对上述显微组分和手选出的树脂体进行岩石热解、红外光谱和活化能分析。结果表明：壳质组的生烃能力较强，生烃范围窄；不同显微组分结构差别较大，产物也不同；镜质体生烃能力相对于壳质组组分非常低，生烃范围宽，且产物以气为主；显微组分的密度与其生烃能力存在一定的负相关性。

Due to the low abundance, poor brittleness and strong lipophilicity of organic matter in source rocks, kerogen enrichment, freezing in liquid nitrogen-thawing at room temperature and adding ethanol to heavy liquid were applied during the separation of macerals in source rocks. The macerals of botryococcus, alginite, cutinite and vitrinite were successfully separated from source rocks in the Luquan area of the Yunnan Province and the Huadian area of the Jilin Province. Rock-Eval, infrared spectroscopy and activation energy analyses indicated that the hydrocarbon generation capacity of the exinite group is strong and the hydrocarbon generation temperature range is narrow. Different macerals have different structures and generation products. Compared with the exinite group, the hydrocarbon generation capacity of vitrinite is lower, the generation temperature range is wider and the products are dominated by gas. There is a negative correlation between maceral density and hydrocarbon generation capacity.

“十三五”国家重大专项“海相碳酸盐岩油气资源潜力评价与勘探新领域”（2017ZX05005-001）资助。

https://doi.org/10.11781/sysydz201806828