Palynofacies analysis of the outcropping Paleogene to early Neogene formations in the Niger Delta provides a snapshot of the palynofacies framework and events related to sequence stratigraphic cycles during the Cenozoic. Five palynofacies groups defined by particulate organic matter were synthesized into four main palynofacies sequence stratigraphic events denoted as A to D, recognized from base to top of the Imo, Nanka and Ogwashi formations. Palynofacies sequence stratigraphic event A in the basal dark grey shales of the Imo Formation is dominated by amorphous organic matter (AOM), opaque particles, and marine palynomorphs, and small numbers of terrestrial microflora suggestive of a transgressive systems tract (TST) for the Selandian section of the formation. High percentages of AOM and opaque particles, paucity of structured phytoclasts, and maximum numbers of dinoflagellate cysts were observed in palynofacies stratigraphic cycle B in the Thanetian section of the Imo Formation, indicating deposits of an early TST. The absence of lath-shaped opaque debris and few equidimensional forms indicated marine depositional origin for the transported opaque debris. A lowstand systems tract (LST) was interpreted for the fining upward sandstone unit separating these TST packages. Palynofacies sequence stratigraphic cycle C, which was identified in the Nanka Formation, was characterized by an increase in terrestrial microflora, structured phytoclasts, and opaque particles, with relative small numbers of dinoflagellate cysts and AOM signifying late highstand systems tract (LHST) for the Ypresian sediments. The attributes of palynofacies stratigraphic cycle D established in the Ogwashi Formation were the maximum numbers of terrestrial palynomorph taxa, structured phytoclasts, opaque debris, abundant AOM and limited amounts of marine species, suggestive of the LST during the Priabonian to Aquitanian. The Niger Delta Basin sediments are interpreted as deposits of the earliest Danian to Thanetian transgression, Ypresian highstand interval and Priabonian to Aquitanian regression interrupted by minor marine transgressions. The palynofacies sequence stratigraphic cycles model demonstrates that an overall basin-wide retrogradation was succeeded by progradation of the delta during the later Cenozoic.

尼日尔三角洲露头古近纪到新近纪早期形成的古相分析提供了新生代构架和与层序地层旋回有关的事件的快照。由Im，Nanka和Ogwashi地层的底部到顶部识别，由颗粒有机质定义的5个古孢粉组被合成为4个主要的古孢粉层序地层事件，表示为A到D。Imo组基础深灰色页岩中的孢粉层序地层事件A以无定形有机物（AOM），不透明颗粒和海洋古植物形态以及少量陆生微生物群落为主导暗示该地层的Selandian段有海侵系统道（TST）。在Imo组Thanetian断层的孢粉地层周期B中观察到高百分数的AOM和不透明颗粒，结构化的破骨细胞稀少以及鞭毛囊藻的最大数量，表明TST早期沉积。没有板条状的不透明碎屑，几乎没有等维形式表明了所运输的不透明碎屑的海洋沉积起源。一个低水位体系域（LST）被解释为向上变细砂岩分隔这些TST程序包的单元。在南卡组中识别出的古昆虫层序地层旋回C的特征是陆地微生物区系，结构化的破骨细胞和不透明颗粒的增加，具有相对少量的鞭毛藻囊和AOM代表了伊比尔人的晚期高地系统道（LHST）。沉积物。在Ogwashi组中建立的古相地层旋回D的属性是陆生古生物类群的最大数量，结构化的破骨细胞，不透明的碎片，丰富的AOM和有限的海洋物种，这暗示了在Priabonian至Aquitanian时期的LST。尼日尔三角洲盆地沉积物被解释为最早的达尼安沉积物Thanetian海侵，Ypresian高水位区间和Priabonian至Aquitanian回归被较小的海侵所中断。孢粉层序地层旋回模型表明，在新生代后期，三角洲的扩张成功地实现了整个盆地的逆向发展。