The Bohai offshore reservoir, characterized by thin interbedded, low-permeability tight sand layers, presents large-scale development potential but low recovery efficiency due to development constraints. Optimizing the well pattern and fracture network is critical to improving production. Addressing gaps in offshore well pattern-fracture network optimization theory, this study employs reservoir numerical simulation. First, horizontal well productivity was maximized by optimizing fracture half-length, conductivity, and fracture spacing. Second, a comprehensive analysis of different well spacing configurations and reservoir layers was conducted, with the objective of maximizing both productivity and revenue under varying proportions of target development layers. Based on these findings, an optimization chart for multi-thin layer offshore fractured well networks was developed. Simulation results indicate that increasing fracture length and conductivity enhances single-well productivity, while reducing fracture spacing further boosts horizontal well performance. Additionally, in cases of large well spacing and high proportions of target development layers, horizontal well fracturing provides significant revenue advantages. These findings offer a theoretical foundation for optimizing well patterns and fracture networks in multi-thin layer offshore reservoirs.