Spore and pollen, alga fossil assemblage of Nenjiang Formation in the western part of Daqing Placanticline
Wan Chuanbiao · Petroleum Geology & Oilfield Development in Daqing · 2004
Based on composition of outside wall of spore and pollen,dinoflagellate,a method of achieving spore and pollen and dinoflagellate simulataneously in an analysis flowsheet is designed.Through experiment repeatedly to complete the method,a very richness dinoflagellate fossil is analyzed from Nen 3 member which not achieving any dinoflagellate by traditional spore and pollen analysis method.Cyathidite-Pinuspollenit-Dinogymniopsis,Dinogymniopsis-Leiosphaeridia-Pinuspollenites,Cicatricosiporites-Pinuspollenites Botryoccocus,Dinogymniopsis-Chlamydophorella-Taxodiaceaepollenites,Cicatricosisporites-Pinuspollenites-Pediastrum,Nenjiangella-Balmula spinosa-Cyathidites,Cyathidites-Trilobosporites-Botryoccocus seven fossil assenmlages which could recognize salinity changing in water body are discovered from top to the bottom. It is also pointed out that Nenjiang algae,distributing stability,are standard fossil of No.3 member in Nenjiang Formation.Richness alga fossil,espicial grape algae is one of the best oil source rock.