辽河拗陷石油地质特征

本文论述了辽河拗陷的区域地质背景、构造和沉积特征、生油条件和生储盖组合关系、油藏类型及其分布规律。从而论证了它与渤海湾盆地其他拗陷的石油地质条件有许多相似之处,同时也具有一系列区别于其他拗陷的特点。构成一种很有特色的油气聚集区类型。

PETROLEUM GEOLOGICAL CHARACTERISTICS OF THE LIAOHE DEPRESSION,LIAONING PROVINCE

The Liaohe depression is a part of the Bohai Bay basin.It was developed on the North China platform, highly denuded during the period from Triassic to middle Jurassic. The block fault movement in late Jurassic produced two fault depressions one each in the east and west side of the Liaohe depression. The block fault movement in Oligocene produced three fault depressions which are separated from each other. Sediments of fluviatile-lacustrne facies were deposited in these fault depressions. The Liaohe depression is provided with excellent conditions for the origin, migration aud accumulation of oil. The three fault depressions are different in abundance of petroleum, with the one on the west side being the fichest. The mode of oil accumulation in the Liaohe depression is different from those in the other depressions in the Bohai Bay basin. In the Liaohe depression, the Oligocene is the main oil-bearing series and oil is mostly accumulated in the west slope of the depression on the west side. Non-structural traps seem to play an important role in the oil accumulation.