• 责任者：Liu Bang (Research Institute of Petroleum Exploration & Development ; PetroChina ; Beijing 100083 ; China) ; Pan Xiaohua
• 刊名：Geoscience
• 出版年：2011
• 卷期：25(5)
• 关键词：Upper Cretaceous ; transgresstion ; 微体化石 ; microfossils ; 生物地球化学 ; biogeochemistry ; 尼日尔 ; Niger
• 页码：p.995-1006
• 图表：6 illus., 57 refs.
• 分类号：1200
• 出版序号：20120320
• issnNo：ISSN1000-8527
• isbnNo：CN11-2035/P

Based on paleontological and geochemical characteristics of the Upper Cretaceous mudstone cuttings in wells of Saha-1 and Helit-1, located in the Tenere and Termit depressions, respectively, this paper provides evidences for marine transgression happened in the eastern Niger Basin in the Late Cretaceous. Paleontological results of cutting samples in well Saha-1 show that they contain marine microfossils. The main geochemical characteristics of these samples are high abundance of gammacerane, β-carotane and dinosteranes which are marine biomarkers. Both microfossil distribution and geochemical characteristics suggest that the Upper Cretaceous strata were deposited in a marine environment.