Research on the Deposition Mechanisms and Production Characteristics of Untabulated Reservoirs in the X Oilfield of the Songliao Basin

No.4 Oil Production Plant of Daqing Oilfield Company Ltd., Daqing 163511, China

Abstract

In the late stage of the ultra-high water cut development, the untabulated reservoir (not included in the submitted reserve sheet) is considered an important part of production sustainability in the X oilfield. According to the coring well data of 5 wells in the eastern district, the untabulated reservoir is associated with higher heterogeneity. Specifically, it develops not only the conventional low and ultra-low permeability sands but also medium-high permeability sands with thickness below 0.2 m. Given this, the research investigates the sedimentary models, spatial distribution, and heterogeneity of the different types of untabulated sand bodies, based on the core analysis. Moreover, the physical model water flooding experiments are carried out and the production characteristics of the different sand bodies in the untabulated reservoir with the different recovery approaches are clarified. The findings of this research effectively solve the development contradictions of the untabulated reservoir and lay down the foundation for the further potential tapping of the untabulated reservoir.