Study on Dominant Seepage Channels and Development Adjustment Based on Streamline Simulation: A Case Study of Liubei Third Oil Formation Well Area

With the waterflooding development of oilfields, the formation of high-permeability channels in reservoirs leads to severe ineffective water cycling and low waterflooding efficiency. Taking the Liubei Third Oil Formation Well Area as the study target, a 3D geological model was established based on detailed single-sandbody characterization. Through historical matching, current formation pressure, remaining reserves, and fluid distribution characteristics of the reservoir were obtained. Building on this foundation, streamline simulation was employed to convert 3D saturation calculations into 1D simulations along individual streamlines, revealing the water injection-production streamline distribution at different timesteps in the study area. Dominant seepage channels were identified based on the streamline distribution patterns. Cumulative flow field intensity was calculated from streamline simulation results, and an integrated flow field characterization system was established by combining cumulative flow field intensity with instantaneous streamline density. Based on the streamline simulation outcomes and actual production data, tailored development adjustment measures were proposed for the target block, providing technical support for efficient reservoir development.