Research on Bottom Water Coning Law of Jurassic Reservoir–Based on Kv/Kh Value Recognition

The ratio of vertical permeability (Kv) to horizontal permeability (Kh) of a reservoir (Kv/Kh) is crucial for studying the bottom water coning law of bottom water reservoirs, understanding the characteristics of horizontal and vertical water drive, and formulating reasonable development technical strategies. Through permeability analysis of 170 cores from the Jurassic bottom water reservoir in the Ordos Basin, it is found that the Kv/Kh values are generally distributed in a normal distribution, and there is a linear quantitative relationship between the two in a dual logarithmic coordinate system. Based on the distribution characteristics of Kv and Kh, the method of combining reservoir engineering with numerical simulation was applied to study the bottom water coning law of Yan10 Reservoir in Block M of F Oilfield,. The following understanding was obtained: (1) When other conditions are the same, the larger Kv/Kh, the faster the bottom water breakthrough time; (2) As Kv/Kh increases, the bottom water sweep efficiency gradually decreases. When Kv/Kh > 0.5, the magnitude of the decrease in sweep efficiency slows down as the value increases; (3) The baffle has a delaying effect on the bottom water coning, and the longer the baffle radius, the farther the baffle is from the oil-water interface, and the more obvious the delaying effect on the bottom water coning. These research results provide a basis for formulating reasonable development technology policies for Jurassic bottom water reservoirs.