湖北荆门下第三系河流性质的分析

ANALYSIS OF STREAM FEATURES OF THE EOGENE SYSTEM IN JINGMEN, HUBEI

本文根据湖北省江汉盆地西北侧下第三系东山组的岩性、沉积构造及其垂直层序,研究了东山组的沉积特征。认为该层为典型的河流沉积,并进一步与河北省滦河低弯曲河段的现代沉积对比,推断了本区的河床类型、河水深度,并运用岩石定向参数判断古水流方向。文章最后指出该河流性质直接影响江汉盆地下第三系下部含油层系的分布。

The area involved in this article is located in the northwest of Jianghan basin, Hubei province. According to the lithological characters, sedimentary structure and the vertical sequence, the sedimentary features in the Dongshan Group of Eogene System are thought of as a typical fluvial deposit. These data mentioned above have been further compared with the modern deposit of low-meander belt of the Luanhe River. The type of the river bed, the depth and the direction of paleocurrent in the northwest of Jianghan basin are deduced. In the end it was pointed out that all of these characters had directly affected the distribution of oil-bearing sandstone body in the lower part of Eogene in Jianghan basin.