Analysis of core casting thin section under different etching time

作者：Guiping Nie, Runhua Zhu, Tonghao Xu · 发表于：IOP Conference Series Earth and Environmental Science · 年份：2021 · DOI：10.1088/1755-1315/859/1/012028 · 被引用次数：1 · 研究领域：Reservoir Engineering and Simulation Methods、Hydraulic Fracturing and Reservoir Analysis、Drilling and Well Engineering

The Missan oil field is located in southeastern Iraq and is an important part of Iraq's oil economy. Carbonate reservoirs in the Missan Oilfield have the characteristics of multiple mineral types, large changes in reservoir physical properties, and strong heterogeneity. It is difficult to develop reservoirs reasonably and effectively. Therefore, subsequent acidification and acid fracturing of the reservoir Reconstruction is necessary. To provide a basis for the selection of input parameters of the subsequent productivity prediction model and improve the effectiveness of acidified acid fracturing reservoir reconstruction, this paper prepares cast thin sections and uses an electron microscope to observe the microscopic pore structure of the thin sections before and after acid etching. The research results show that acid etching will significantly increase the storage space, and the dissolution rate and dissolved pore morphology of different types and shapes of minerals after exposure to acid have obvious differences. The accuracy has certain guiding significance.