Study on the Displacement Characteristics and Microscopic Properties of the Reef Limestone Reservoir in Liuhua Oilfield

doi:10.11885/j.issn.1674-5086.2017.09.04.02

Abstract

Abstract: Compared to clastic reservoirs, reef limestone reservoirs are oil wettable and their microscopic porous structure is complex. Furthermore, the main factors controlling their water flooding mechanism are still not clear. This study combined static data from rock core SEM, casted rock thin sections, mercury injection, wettability tests, and dynamic experiments, such as microscopic displacement and core displacement, in analysis and established a new method to study the seepage mechanism that involves the dynamic usage of static data. The microscopic properties and fluid displacement characteristics of the Liuhua reef limestone reservoir, and the distribution pattern of residual oil in different porous structures were also identified. The microscopic porous structure of the reservoir was classified into four types, of which type I, Ⅱ and Ⅲ are favorable reservoirs with low displacement pressure, low mercury withdrawal efficiency, and strong heterogeneity. Percolation in the reservoir is closely related to the reservoir type, and controlled by three key factors:reservoir type, pore throat radius ratio, and wettability. The distribution characteristics of oil and water before and after water flooding, and the displacement dynamics and effects in different cores are controlled and directly linked to the microscopic properties of reservoirs.

Key words: Liuhua Oilfield, reef limestone reservoir, microscopic properties, displacement characteristics, microscopic porous structure

CLC Number:

TE122

NING Yuping, WANG Junfeng, LUO Donghong, ZHANG Wei, DAI Zong. Study on the Displacement Characteristics and Microscopic Properties of the Reef Limestone Reservoir in Liuhua Oilfield[J]. 西南石油大学学报(自然科学版), 2017, 39(6): 34-44.

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