平衡剖面技术在洼陷构造分析中的应用——以临南洼陷古近系为例

Application of Balanced Section Techniques in Analyzing Depression Structures——Setting Paleogene Linnan Depression as an Example

平衡剖面技术作为现代构造地质学领域的一项重大成就,在构造地质、石油地质与勘探以及盆地模拟方面应用广泛。该文在介绍平衡剖面技术的基础上,根据平衡剖面原理对临南洼陷研究区内的5条地震剖面进行了平衡剖面的恢复以及伸展参数的计算,对该地区的构造演化史进行了分析。研究表明,临南洼陷古近纪构造活动强烈,构造活动由早到晚基本具有由强减弱的趋势,孔店组沉积时期盆地的构造沉降和伸展活动最强,沙河街组一段到东营组沉积时期盆地的伸展活动趋于微弱,到新近纪盆地的伸展活动基本停止。

As an important technique in the study of tectonic evolution of basins,balanced section technique has been widely used in structural geology,petroleum geology,exploration and basin simulation.On the basis of introducing balanced section technique,according to the principle of balanced cross section,five main seismic sections in Linnan depression study area have been recovered and extensional parameters have been calculated.Tectonic evolution history of this region was analyzed as well.It was showed that Paleogene tectonic activity was strong in Linnan depression,tectonic activity became more and more weaker from morning till night,tectonic subsidence and stretching activities of this basin in Kongdian period was the strongest,extension activities in the basin became weaker during the first section of Shahejie formation and Dongying formation,and the extensional activities stopped in Neogene basin.