秋里塔格构造带油气聚集分段性及成因机制

Segmentation of oil and gas accumulation in Qiulitage structural belt and its forming mechanism

为了寻找秋里塔格构造带油气富集规律 ,对该区的油气性质及油气聚集层位进行了分析 .结果表明 ,目前在该构造带东段和西段发现的油气性质差异很大 ,具有东西分段的特点 .天然气中甲烷与乙烷的含量表明 ,该构造带上的天然气都是侏罗系和三叠系天然气混合形成的 ,这对于分析东、西段成藏过程的差异性具有十分重要的意义 .秋里塔格构造带东西段储盖组合的分布层位的不同导致了油气分布层位在东西向上的差异 .构造活动的差异导致了东、西部构造圈闭形成的时期、成藏期及成藏过程都有着较大的差异 ,这也是造成该构造带油气聚集分段的重要原因 .另外 。

In order to seek hydrocarbon accumulation zones in Qiulitage structural belt, the property of the oil and gas and the hydrocarbon accumulation horizons in this area are analyzed. It is shown that the properties of the oil and gas discovered between the eastern segment and the western segment of the structural belt are very different. The contents of methane and ethane in the natural gases from the eastern segment and the western segment shows that all the gases in this area are the mixture of gases from Jurassic and Triassic, and this is very important to analyzing the difference in reservoir formation processes of the two segments. And the difference of the reservoir—cap rock combination causes the different horizons of oil and gas accumulation. The difference in the structural activities in the two segments causes the differences in the time of trap and pool formation and the process of pool formation. In addition, diffusion is also an important factor to cause the segmentation. At last, it is pointed that the principle of exploration in this area is searching oil in the western segment and searching gas in the eastern segment.