New discovery in oil and gas exploration in Changling depressed area, Songliao basin using modern exploration technology

摘要

Changling depressed area is located in the central south Songliao basin. Only one oilfield - Qianan oilfield with 70 million tons oil reserves was discovered in this area during the past 40 years' exploration. In recent years, with the application of integrated modern exploration techniques, important discoveries are made in this area, and about 100 million tons of oil reserves are discovered in Cretaceous sandstone reservoir in Daqingzijing oilfield which is located in the center of Changling depressed area. This oilfield lays in the big Baokang delta-front belt which flowed into the lake along the long axis of the basin. Its tectonic setting is in the synclinal area of Changling depressed area. The reservoir is controlled by lithology, and the oil-water relation is complicated. The highly concealed characteristics made it more difficult to discover. Modern exploration techniques headed by high-resolution 3D seismic play an important role in the exploration work of this area, providing a way for the further exploration of the explored mature area in the basin.