Analysis of Oil-Water Distribution Characteristics of Y Reservoir in Z Oilfield

The P reservoir of Z oilfield has been developed for more than 30 years and it is difficult to find large-scale reserves. The F reservoir, as the main replacement reservoir, has poor physical properties and is difficult to develop. Therefore, it is necessary to strengthen the exploration and evaluation of new strata. During the drilling process of the first drilling well in Block B, Y reservoir was drilled, and the surrounding wells were deepened to develop Y reservoir. After that, the industrial oil flow was obtained by fracturing and testing of Y reservoir, which confirmed that Y reservoir has development potential. No detailed evaluation study has been carried out for Y reservoir, so it is necessary to carry out in-depth analysis on oil-water distribution characteristics. In this paper, we apply oil testing and logging data from 47 wells in Z oilfield to conduct a comprehensive analysis of reservoir logging response characteristics, based on the study of the relationship between lithology, physical properties and oil-bearing property, to establish an oil-water identification chart for Y reservoir, and to clarify the horizontal and vertical oil-water distribution characteristics and formation reasons. Structure controls the hydrocarbon accumulation in Y reservoir. The oil layer is mainly concentrated in the high part of the structure, and the water layer is relatively concentrated in the low part of the structure. The vertical distance between source and reservoir controls the hydrocarbon accumulation, resulting in the vertical distribution of oil layers in the upper part of YI Group.