辽河坳陷下第三系沙三段深断槽发育特点及其油气勘探意义

The Early Tertiary Shahejie Faulted Trough in Eastern Liaohe Basin and Its Implications to Oil and Gas Resources

辽河东部凹陷断槽构造发育、岩相充填及油气分布。凹陷内主干断裂的伸展和走滑作用控制着深断槽的发育与演化 ,充填断槽的沙三段地层以侧向和径向的扇三角洲体系的河道砂体为主 ,并主要沿斜坡和低洼断槽的轴线分布 ,是岩性油气藏发育的有利部位 ,走滑断裂活动使断槽高部位火山岩形成大量构造裂缝 ,并发育火山岩油气藏。勘探实践证明 ,深断槽内沙三段赋存丰富的油气资源。

This paper presents a discussion on the formation, depositional filling and oil and gas distribution in the faulted trough within the eastern Liaohe basin. Researches show that the formation of the faulted trough is related to the extension and slipping of dominant faults, and the fillings in the faulted trough are characterized by channel sandstones of lateral and radial fan deltas along the trough slope and axis, which constitute the favorable locations for oil and gas reservoirs. A lot of fractures and pores within volcanic rocks on the highland of the trough were formed by fault slipping, giving birth to volcanic oil reservoirs. Exploration indicates that the No.3 member of Shahejie Formation in the faulted trough is rich in oil and gas resources.