Organic geochemical characteristics of diatomite in Nadanhada terrane

Based on the geochemical characteristics of the siliceous rocks in the Nadanhada terrane, the abundance, type and maturity of organic matter are studied, and the source rocks in Fuyuan, Raohe and Hongqiling are comprehensively evaluated. The type of organic matter in this area is mainly type III kerogen, which is in the high over mature stage with low metamorphic degree. At present, liquid hydrocarbon can still be produced. The Qianjin depression (Fuyuan area) of Sanjiang basin is a favorable area for the exploration of Lower Jurassic cherts with high organic matter abundance, low maturity and good preservation conditions.