论文部分内容阅读
以Sr含量、Sr/Ba值和Th/U值等地球化学指标及生物遗迹化石作为判识标志,对鄂尔多斯盆地延长组长7油层组沉积环境水介质条件与古气候进行了分析:结果表明长7油层组沉积期古水介质Sr/Ba值为0.19~0.65、Th/U值为0.36~5.03,属陆相淡水环境;V/Ni值为1.75~5.53,属于还原环境;通过元素组合及生物遗迹化石、钴元素定量计算显示水体深度介于半深湖—深湖之间,最大古水深为50~120 m;孢粉组合分析古气候属较温暖潮湿气候。
Based on the geochemical indicators such as Sr content, Sr / Ba value and Th / U value and biotite fossils, the sedimentary environment and palaeoclimatic conditions of Chang 7 reservoir in Yanchang Formation, Ordos Basin, are analyzed. The results show that the long In the depositional period of the oil-bearing formation, the Sr / Ba values of ancient water medium ranged from 0.19 to 0.65 and Th / U values ranged from 0.36 to 5.03, which belonged to the terrestrial freshwater environment. The V / Ni value ranged from 1.75 to 5.53 and belonged to the reducing environment. The quantitative calculation of trace fossils and cobalt shows that the water depth is between half-deep lake and deep lake, and the maximum paleo-water depth is 50 ~ 120 m. The paleoenvironment of the sporopollen assemblage is warm and humid.