烃源岩<2 μm黏土粒级组分可溶有机质的测定及意义

Characteristics of Soluble Organic Matter Combined with <2 μm Clay Size Fraction of Source Rocks and Its Significance

摘要:

通过对烃源岩中提取<2 μm黏土粒级组分进行总有机碳(TOC)测试、氯仿抽提和族组成分析,探讨了烃源岩中可溶有机质与细粒级黏土矿物的关系,与传统烃源岩全岩可溶有机质研究对比得出:与细粒级黏土矿物结合是烃源岩全岩可溶有机质的重要赋存方式之一;黏土粒级组分可溶有机质产率高于全岩,70%以上样品产率在100 mg?g-1以上;产率变化与全岩同步,但高峰期较全岩滞后,在生烃不同阶段黏土粒级组分对可溶有机质都有重要贡献.<2 μm黏土粒级组分是烃源岩中可溶有机质的主要载体,两者形成的复合体是一种潜在生烃母质,而且贯穿于有机质生烃的全部过程,在油气研究中应予以足够重视.

Abstract:

In order to investigate the relationship between soluble organic matter (SOM) and clay size fraction,SOM extracted from source rock and <2 μm clay size fraction (separated by a physical approach from source rock) were analyzed.The results show that a large amount of SOM are combined with clay minerals and it is an important occurrence in source rocks.The rate of SOM production is higher in clay size fraction compared with that in source rock,and <2 μm clay size fraction plays an important role in each period of hydrocarbon generation.The composition of SOM in clay size fraction exhibits as domination in nonhydrocarbon and asphaltene groups and depleted in polar lipid fractions including saturated hydrocarbon and aromatic components compared with SOM extracted from source rocks.It can be concluded that organoclaymineral is a potential material of oil generation throughout the whole progress of hydrocarbon generation.