The determination of the original oil-water interface and tracking the dynamic oil-water interface change in fault-karst carbonate reservoir driven by bottom water have always been an important problem restricting the prediction of remaining oil.The study focuses on the reservoir nature of the oil-water interface,finely characterizes,and quantifies the pore volume of the reservoir,develops dynamic data and well testing processing to calculate the water oil volume ratio,and then dynamically and statically allocates the oil-water volume in equal proportion to calculate the original oil-water interface and divide the oil-water interface inside the reservoir.In the later stage,the water drive stage is divided according to the process evaluation curve of water drive.The dynamic oil-water interface change is tracked to avoid the difficulty in selecting parameters and large calculation error in the previous conventional method.
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