新疆北部石炭系高演化烃源岩加氢催化裂解实验

Catalytic hydropyrolysis for highly mature Carboniferous source rocks in the northern Xinjiang

李艳丽 林会喜

Li Yanli Lin Huixi

中国石化 胜利油田分公司 勘探开发研究院西部分院, 山东 东营 257000

Western Branch of Exploration and Development Research Institute, SINOPEC Shengli Oilfield, Dongying, Shandong 257000, China

针对新疆北部石炭系高演化烃源岩常规索氏抽提物含量低的特点，开展加氢催化裂解实验，对比分析两者的生物标志化合物特征，提高烃源岩的沉积背景及母源特征研究的可靠度。结果显示应用氢解产物的正构烷烃和甾烷化合物指示母质来源效果更好。浅部泥岩的正构烷烃呈nC18和nC22-24的双峰型分布，表明远洋水生浮游动物的贡献大，而深部泥岩呈主峰碳为nC18-nC24的单峰型分布，指示以低等菌藻类水生生物贡献为主；抽提物中C27和C29规则甾烷含量相当，指示混合母质来源，而氢解产物中规则甾烷以C29为主，明确指示单一的母质来源。此外，氢解产物中含有更加丰富的βα-莫烷及ββ-升藿烷系列化合物，丰富了烃源岩的母质信息。研究明确石炭系烃源岩发育于较还原的沉积环境，优质烃源岩主要分布在下段，以菌藻类等单一的水生生物为有机母质来源，具备良好的生烃的背景及物质基础。实验也进一步证实氢解实验能够获取更多的生物标志物信息，对常规抽提方法是一种有益的补充。

The Carboniferous source rocks in the northern Xinjiang have the characteristics of high thermal evolution, which leads to the low level of biomarkers from conventional extraction. Catalytic hydropyrolysis was carried out in order to study the sedimentary background and organic matter biological sources. The results show that the n-alkanes and steranes from hydrogenolysis are representative of parent materials. The n-alkanes have a bimodal pattern with the main carbon peaks at n-C18 and n-C22-24 in shallow mudstones, indicating a contribution of pelagic aquatic zooplankton, and have a single-peak pattern with the main carbon peak at n-C18-n-C24 in deep mudstones, indicating a contribution of aquatic bacteria and algae. The contents of C29 and C27 steranes are comparable, which indicates a mixed source. In the pyrolysis products, the content of C29 steranes is much higher, which clearly indicates a single parent material. Moreover, hydropyrolysis products contain more βα-moretanes and ββ-homohopanes. The Carboniferous source rocks were mainly developed in a reducing environment. High-quality marine source rocks of Carboniferous are mainly distributed in the lower segment with aquatic organisms such as bacteria and algae as a single source of organic matter. The experiments also confirmed that the hydrogen hydrolysis reaction could recover more information of biolo-gical markers, which is a useful supplement to conventional extraction methods.

国家科技重大专项02课题（2011ZX05002-002）和中石化重大科技攻关课题（P12035）资助。

https://doi.org/10.11781/sysydz201701120