基于恒速压汞的储层微观孔隙结构特征研究

储层的微观孔隙结构是指储集层中岩石的孔喉大小、分布及连通关系。有关储层微观孔隙特征的研究对于准确评价储集层性能及后续开采措施的选择尤为重要。采用恒速压汞法对南五区二类储层微观孔隙结构特征进行研究。根据压汞实验得到各微观孔隙结构的特征参数,与渗透率建立散点分布图,研究各孔隙结构参数对渗透率的影响程度,得出相关系数的大小,进而对各微观孔隙结构参数进行主次划分。在此基础上重点统计各主要参数的压汞实验结果,结合渗透率分布,得到各参数的平均值及分布范围,分析南五区二类储层的微观孔隙结构特征,为后续渗流规律及聚驱配伍性研究提供依据。

Study of the microscopic pore structure characteristics of the reservoir under constant-rate mercury penetration

The microscopic structure of the reservoir refers to the size of pore throat, the distribution and the connecting relation of the rocks. The study of the reservoir microscopic pore characteristics plays a vital role in the accurate evaluation of reservoir properties and the subsequent selection of mining measures. The constant-rate mercury penetration method is applied to study the microscopic pore structure characteristics of the second type reservoir in the South 5 area. Microscopic pore structure characteristic parameters are obtained through mercury intrusion test, then the characteristic parameters and the permeability are combined to establish the scatters distribution diagram. The influence of the pore structure parameters on the permeability is studied, the correlation coefficient is obtained, and the microscopic pore structure parameters are classified. The key statistics of the main parameters under mercury injection experiment is obtained, and based on the combination of the result with the permeability distribution, the mean value and the distribution range of each parameter are determined, so that the microscopic pore structure characteristics of the second type reservoir in South 5 area is analyzed. It provides the basis for the subsequent seepage law analysis and polymer compatibility study.