断层在油气运移聚集中的作用

以吉林伊通地堑五星构造带第三系双阳组二段油气藏为例,采用地球化学方法对双阳组二段油气的来源进行判识,结果表明该区存在两种不同来源的油气,其成熟度均不高,相当于源岩镜质体反射率Ro为0.6~0.8%左右的产物,一是造成了工业聚集的油气,来源于新安堡凹陷的永吉组源岩,靠近2号断层呈条带分布,另一种油气来源于新安堡凹陷的双阳组源岩,没有形成大规模的工业聚集,远离2号断层分布;2号断层正、逆性质的转变在油气的运移、聚集中起着关键的作用。

The Role of Fault in the Petroleum Migration and Accumulation

In this paper,petroleum sources on Lower Tertiary of Wuxing structural belt in Yitong graben,Jilin Provinces is studied by geochemistry method. It is indicated that there are two sources of petroleum, their maturity is not high enough (Ro=0.6-0.8%). One comes from Yongji Formation in Xinanbao, which results in the accumulation of commercial petroleum, distributes near No.2 fault. Another comes from Shuangyang Formation, it is far away from No.2 fault and with no productive capacity. No.2 fault plays a very important role in the petroleum migration and accumulation in this area.