原油二次运移过程中的逾渗主脊实验研究

Experimental study on percolation backbone of secondary migration of crude oil

闫建钊 罗晓容 张立宽 雷裕红

Yan Jianzhao Luo Xiaorong Zhang Likuan Lei Yuhong

中国科学院地质与地球物理研究所油气资源研究重点实验室, 北京, 100029

Key Laboratory of Petroleum Resource Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

利用Hele-Shaw模型开展二维空间原油持续二次运移过程实验研究。在初始运移路径形成后改变注入煤油的颜色,验证二次运移过程中的逾渗主脊现象,初步从机理上指出初始运移路径形成后毛管力的变化是逾渗主脊形成的主要原因。逾渗主脊的尺寸和分形维数都要小于对应的初始运移路径的尺寸和分形维数。油气以这样的方式发生二次运移,加速了运移速率,二次运移过程中的烃损失量只限于初始路径。

The experimental studies of the continual secondary migration of crude oil have been carried out 2-dimentionally using the Hele-Shaw model.The percolation backbone of the secondary migration of crude oil has been verified by changing the color of injected oil after the formation of initial migration pathway.Buoyancy and capillary force changes after the formation of initial migration pathway are the main reason for percolation backbone.The size and fractal dimension of the backbone are smaller than those of the corresponding initial migration pathway.The backbone limits the losses of oil during secondary migration and accelerates the process,so it enhances the secondary oil migration efficiency.

国家自然科学基金项目(40772090,40902041)资助

https://doi.org/10.11781/sysydz201201099