砂岩透镜体油藏聚油机理及成藏模式

Accumulation Mechanism of Sand Lens Reservoir and Its Generation Model

张云峰,付　广,于建成

Zhang Yunfeng，Fu Guang,Yu Jiancheng

大庆石油学院,大庆石油管理局采油六厂

Daqing Petroleum Institute , Heilongjiang 151400 , P. R. China

通过对油气运移的受力状态进行分析,探讨了不同类型砂岩透镜体油藏聚油机理,根据砂岩透镜体油藏与烃源岩之间的相对位置关系将其划分为源岩内和源岩外两种模式,认为毛细管力是源岩内砂岩透镜体聚油的主要动力,而排烃压力、浮力等动力大于毛细管力、粘滞力等阻力是源岩外砂岩透镜体油气聚集的必要条件。典型实例分析对寻找砂岩透镜体油藏有一定的指导意义。

This paper discussed the oil accumulation mechanism of different types of sand lens reservoirs by analysing their stressed states during oil and gas migration. Two models of inside source-rock and outside source-rock were divided according to the relative locations between sand lens pools and source-rocks. It is thought that capillary pressure is the primary power of oil accummulation in sand lens inside source-rock. However , it is necessary that explosion hydrocarbon pressure , buoyancy are more than resistance force of capillary pressure 、viscous drag etc. for oil accumulating in sand lens outside source-rock. Typical examples analysis have guiding meaning for seeking sand lens reservoirs.