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利用盆地周缘露头、盆内钻井资料系统总结了银根—额济纳旗盆地白垩纪的地层、古生物特征,探讨了白垩纪的古环境.白垩系划分为下统巴音戈壁组、苏红图组及银根组,上统乌兰苏海组.地层特征盆地各区差异明显,巴音戈壁组北、东部以含烃源岩,西南部以不含烃源岩为特征;苏红图组西部以不含火山岩系和含煤层,东部以含火山岩系为特征.白垩系地层中发育介形类、双壳类、叶肢介、轮藻、藻类、腹足类、鱼类、昆虫、古植物和孢粉等多门类古生物化石.白垩纪可分为早白垩世的暖温带—亚热带干湿交替过渡性气候和晚白垩世的亚热带—热带半干旱—干旱气候.
Using Cretaceous paleoenvironmental characteristics and Cretaceous paleoenvironment from Cretaceous in Yingen-Ejinaqi Basin, the outcrop of basin basin and drilling data system in basin were used to summarize the Cretaceous paleoenvironment.The Cretaceous is divided into the lower Bayingebi Formation, Suhongtu Formation and root And the Wulan-Suhai Formation in the upper strata.The stratigraphic features are obviously different in all areas of the basin, with the source rocks in the north and east of the Bayingebi Formation and the source rocks of the non-source rocks in the southwestern part of the Bayingebi Formation. The volcanic rocks And coal-bearing strata, and the eastern part is characterized by volcanic rocks. The Cretaceous strata have many kinds of orthologs, bivalves, leaves, chalazs, algae, gastropods, fish, insects, ancient plants and sporopollen Many types of paleontology fossils. Cretaceous can be divided into Early Cretaceous warm temperate - subtropical alternating wet and dry climate and Late Cretaceous subtropical - tropical semi-arid - arid climate.