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前言陕甘宁盆地北缘乌兰格尔地区的白垩系油苗,在东西长100公里、南北宽13公里的狭长带上断断续续都有分布,范围之大,可称得上我国最大油苗之一。该油苗从五十年代初期发现以后,就引起了地质界的密切关注。因其含油层位系白垩系靠近底部的一套灰绿色粗砂岩或细砾岩,本身不具备生油条件,故对其来源问题,有所争论。经过五十年代后期原银川石油勘探局,对白垩系油苗进行了专题研究后认为:白垩系油苗,共油源来自二迭系。但因当时手段限制,未进行过油源对比。
Foreword Cretaceous oil-bearing plants in the Wulangeer region on the northern margin of the Shaanxi-Gansu-Ningxia Basin are distributed intermittently on a narrow belt of 100 km in east-west length and 13 km in north-south width, and can be said to be the largest in China one. Since its discovery in the early 1950s, it has aroused the close attention of the geological community. Because of its oil-bearing layer of Cretaceous near the bottom of a set of gray-green coarse sandstone or fine conglomerate, itself does not have oil production conditions, so its source, there are controversial. After the late 1950s, the former Yinchuan Petroleum Exploration Bureau conducted a special study on the Cretaceous oil sprouts and concluded that Cretaceous oil sprouts and oil sources are derived from the Second Diego series. However, due to the limitation of means at that time, no oil source comparison was carried out.