Fractured Basement heavy oil reservoirs exhibit strong reservoir heterogeneity and complex flow mechanisms, posing significant challenges for efficient development. To overcome these development bottlenecks, this study takes the BC2 heavy oil field (in-situ viscosity 398 mPa·s) as an example to systematically elaborate an integrated “Geology-Engineering-Energy” development technology system. The core of achieving efficient development involves three key aspects: (1) using fine geological characterization to quantitatively characterize the geometry and connectivity of fracture networks; (2) optimizing cluster highly-deviated well patterns with trajectories specifically designed to intersect the dominant high-angle fractures; and (3) calculating the critical production rates by using well test data and simulation results, to take advantage of the natural water drive without water breakthrough. This strategy fully takes advantage of natural water flooding to slow down pressure depletion, while optimizing well pattern based on fracture distribution and basement structure, which reduces the drilling costs and expands the drainage area. From BC2 Field development practices, it realizes sustained stable production for 5 years under natural energy development, with per-well productivity around 400–600 bbl/d and water cut below 5%. The study introduces a new “Geology-Engineering-Energy” synergy methodology, establishing the techniques of fracture-targeted drilling and well pattern optimization, also creating an economic development mode of “fewer wells while higher production” for strongly heterogeneous basement (heavy oil) reservoirs. This approach provides valuable references for efficient exploitation of similar resources.