海相烃源岩有机质丰度的影响因素

Factors Affecting Organic Matter Abundance of Marine Source Rocks

影响海相烃源岩有机质丰度的因素主要为有机质来源、生物生产率以及沉积环境,其次是矿物岩石作用和沉积速率,其他因素还包括微量元素、物理化学作用、保存条件和演化程度等。以甲藻、颗石藻等浮游藻类为有机质来源的海相烃源岩有机质丰度往往很高,TOC一般大于1%。在高生物生产率海洋区域,海相有机质具有很高的富集程度。海相烃源岩大多形成于弱碱性水、咸水以及弱水动力的还原环境。

The main factors that affect abundance of organic matter in marine source rocks include origin of organic matter, productivity of organism, sedimentary environment. The minor factors are sedimentary velocity and mineral effect of organic matter and other factors are microelement, physiochemisty, preservation condition, organic matter evolution etc.. Study result ravels that higher abundance of organic matter is from dinoflagellates and coccolithes, which usually have larger than 1%-2% of TOC. Marine organic matters have high enrichment degree in high-life- productivity areas. Most of marine source rocks are formed in such deoxidized environment as alkalescence salt water and weak water dynamics.