伏尔加—乌拉尔地区的后生作用成因圈闭油藏

• 作 者: Л.Д.Виноградовдр 杨远聪
• 出 处: 国外油气勘探
• 发表日期: 1984年05期
• 关键词: 油藏 后生作用 圈闭 含油层 奥伦堡 砂岩层 中泥盆统 油水界面 等时线 古隆起

最近五年来,在东奥伦堡地区北部的中泥盆统和上泥盆统砂岩层中发现了七个油田(图1)。起初人们把在等时线图上的低幅度(到10毫秒)地震正异常作为定井位的依据。但是,在这些地方钻井并得到良好结果之后才开始认识到,油藏是分布在向南倾斜的十分陡的单斜上(落差为每公里12米),烃类的聚集不受含油层现代构造的控制,具有倾斜的油水界面。

In the last five years seven fields have been discovered in the Middle Devonian and Upper Devonian sandstones in the northern part of the Eastern Orenburg region (Figure 1). Initially, people used the low-amplitude (up to 10 milliseconds) seismic anomaly on the isochrone plot as a basis for well positioning. However, drilling in these areas with good results began to recognize that the reservoirs were distributed over a very steep monocline sloping southwards (a drop of 12 meters per km), and hydrocarbon accumulation was not affected by the modern structure of the oil-bearing formation The control has a tilted oil-water interface.