老君庙油田形成的新观点

NEW VIEWPOINT OF FORMING LAOJUNMIAO OILFIELD.

历来认为，老君庙油田是石油从青西凹陷，经简单二次运移而形成的。这个观点已被原油性质在横向上清晰变化所证实。但是，如果把老君庙背斜形成的时间与青西凹陷下白垩统烃源岩的生油和排烃过程结合起来分析，就会发现老君庙油田形成与它所在的背斜带上油田的形成密不可分，它的形成是二次生油和再次运移的结果。根据这一认识判断，青西凹陷的西北缘应具有良好的油气勘探前景，在整个阿尔金走滑构造域的诸盆地油气勘探中，可应用这一观点以求有新的发现。

It has always been considered that the oil in Laojunmiao oilfield was sourced from Qingxi sag by means of secondary migration, and this viewpoint has been verified by obvious lateral change of crude oil properties. However, analysing the forming time of Laojunmiao anticline combined with hydrocarbon generation and expulsion from Lower Cretaceous source rock in Qingxi sag, we discovered that the formation of Laojunmiao oilfield has a close relation with other oilfields in anticlinal belt, which is the result of secondary oil generation and remigration. Based on this viewpoint, it can be inferred there is better hydrocarbon potential in northwestern margin of Qingxi sag, new discovery is expected in oil/gas exploration over basins in the whole Altun strikeslip structural belt.