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松辽盆地断陷期分为 1个超层序组、3个超层序、6个层序。从火石岭组到营城组构成一个完整的活动大陆边缘火山—断陷超层序组。三个超层序分别为同碰撞期火山—断陷超层序 (火石岭组 )、火山间歇期断陷超层序(沙河子组 )和后碰撞期火山—断陷超层序 (营城组 )。超层序组底界 T5界面是前三叠纪拼合基底与侏罗系火山岩—沉积岩互层序列之间的反射界面 ,界面上下层系之间的间断时限≥ 4 5 Ma;界面之下是古亚洲洋构造域时期形成的拼合基底 ,界面之上是鄂霍次克洋构造域形成的火山—沉积建造。超层序组顶界 T4 界面是断陷期火山岩—碎屑岩互层序列与上覆坳陷期正常沉积岩层序之间的反射界面 ,界面上下层系之间的间断时限为 3～ 5 Ma;界面之下是鄂霍次克洋构造域晚期形成的火山—沉积建造 ,界面之上是太平洋构造域早期形成的坳陷期沉积层序。层序对油气的控制作用十分明显。高产工业气藏主要见于超层序组的顶界面 ;工业气藏和低产气藏主要出现在层序界面附近 ;层序内部一般多形成低产气藏或差气层
The Songliao Basin fault depression period is divided into one super-sequence group, three super-sequence and six sequence. From the Huoshiling Formation to Yingcheng Formation, a complete active continental margin volcano-rift superposition sequence group is formed. The three super-sequences are respectively the sequence of volcanic-fault super-sequence (Huoshiling), volcanic interval fault super-sequence (Shahezi Formation) and post-collision volcanic-fault super-sequence (Yingcheng group). The T5 interface at the bottom boundary of the super-sequence sequence group is the reflection interface between the inter-stratigraphic sequence of the Pre-Triassic basement and the Jurassic volcanic-sedimentary rocks. The interval between the upper and lower stratigraphic sequences is ≥ 45 Ma. The combined substrate formed during the Asian tectonic period was volcanic-sedimentary formation formed by the Okhotsk tectonic domain. The T4 interface at the top of the super-sequence sequence group is the reflection interface between the faulted phase volcanic-clastic interbedded sequences and the normal sedimentary sequence in the overlying depression. The interval between the upper and lower interbedded systems is 3 ~ 5 Ma Below the interface is volcanic-sedimentary formation late in the Okhotsk Ocean tectonic domain. Above this interface is the sedimentary sequence of the depression formed during the early period of the Pacific tectonic domain. Sequence control of oil and gas is very obvious. High-productivity industrial gas reservoirs are mainly found at the top interface of the super-sequence group; industrial gas reservoirs and low-yield gas reservoirs mainly appear near the sequence boundaries; generally, low-yield gas reservoirs or poor gas reservoirs are formed within the sequence