Impact of Terrigenous Organic Matter Input on Organic Matter Enrichment of Paleocene Source Rocks, Lishui Sag, East China Sea

To clarify the organic matter (OM) enrichment of Lishui Sag, factors influencing variable abundance OM in Lingfeng Formation are studied using geochemical data. The source rocks have medium–high total carbon (TOC) values (0.53–3.56%). main type kerogen is II2-III. Compared to shallow marine subfacies rocks, TOC delta front higher. distribution biomarkers shows that redox environment rock sub-oxidizing and oxic environment, mainly supplied by terrigenous higher plants; a sub-reducing suboxic comes from algae. link between input demonstrates (TOM) has considerable influence on abundance. However, there no obvious relationship preservation abundance, which suggests not determining element enrichment. strong sediment flux decreases amount time exposed oxygen. As result, with large TOM huge number excellent rocks. This paper proposes “delta front-OM model” for