论深层气与深盆气——以潍北凹陷为例

以潍北凹陷为代表的第三系断陷盆地深层具有较丰富的天然气藏，且显示出深盆气的部分成藏特征。深盆气成藏机理表现为典型的活塞式气水排驱成藏特征，是一种较稳定的成藏模式。潍北深层气在成藏机理上表现为深盆气模式，在张性断陷盆地的地质条件下又有其独特的成藏特点，是岩性和构造圈闭起主要的控制作用，并将成藏单元、压力系统复杂化的深盆气藏，构造岩性封堵和水封堵之间没有明显的界限。后期构造活动弱、储层与外部连通性差的部位有利于深层气成藏，有利的储集相带是深层气勘探的重点目标。

On deep gas and deep basin gas in Weibei Depression

The deep part of Tertiary rifted basin representative of Weibei Depression has relatively abundant gas. This kind of gas has been called deep gas and has partial reservoir forming characters of deep basin gas. The reservoir forming mechanism of deep basin gas shows typical gas and water drive character of piston - pattern , and it is a stable reservoir forming pattern. The forming mechanism of the deep gas in Weibei Depression is the same as the deep basin gas, and has unique forming feature in tensional rifted basin. It is deep basin gas reservoir,which is relatively controlled by lithologic and structural traps and has more complex reservoir units and pressure systems. Exceptionally, it does not have clear boundary between structural lithologic blocking and water blocking. It is easy to form deep gas reservoir in the positions of weaker tectonic activity and less connectivity between reservoirs and the external. The advantageous reservoir facies is the key objects to explore deep gas.