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在油气勘探和开发研究中,对于古水体盐度、古气候、古水深等方面的基础研究十分薄弱。利用粘土矿物、古生物、微量元素分析古盐度,利用孢粉特征分析古气候,利用泥岩颜色分析古水深,从而分析高邮凹陷深凹带戴一段古水体特征。研究区粘土矿物以绿泥石为主,其次为蒙伊混层,伊利石含量较少; 古生物主要有介形类、轮藻和腹足类等; 锶钡比值平均为0.98,铷钾比值平均为0.0039,硼镓比值平均为3.95,说明研究区戴一段处于陆相淡水湖泊环境; 孢粉特征反映高邮凹陷戴一段沉积时期气候温暖而潮湿。泥岩颜色反映了研究区水体深度不大,常常暴露于地表,处于氧化环境。纵向上,研究区岩心泥岩颜色由深灰色—棕红色—灰色—深灰色变化,反映了古水深逐渐增加的过程。
In the research of oil and gas exploration and development, the basic research on paleoclimate salinity, paleoclimate and palaeosalinity is very weak. The palaeoclimate was analyzed by using clay minerals, paleontology and trace elements, the palaeoclimate was analyzed by using the characteristics of sporopollen, and the paleo-water depth was analyzed by shale color. The clay minerals in the study area are mainly chlorite, followed by the Montan layer, the illite content is less; paleontology are mainly Ostracoda, Chaetoceros and gastropods; strontium barium ratio average of 0.98, rubidium potassium ratio average 0.0039, and the average ratio of boron to gallium is 3.95, indicating that Dai first is in the terrestrial freshwater lake environment. The sporopollen characteristics reflect the warm and humid climate during the deposition of the Dai Member in Gaoyou Sag. Mudstone color reflects the study area is not deep water, often exposed to the surface, in an oxidizing environment. Longitudinally, the color of core mudstone in the study area changes from dark gray to reddish brown to gray-dark gray, which reflects the gradual increase of paleobath depth.