High-Resolution 3D Geomechanical Modeling for Hydraulic Fracturing Optimization: A Case Study in the Bai Jiantan Formation

Abstract

The efficient development of unconventional reservoirs is fundamentally challenged by strong geological heterogeneity and variations in rock mechanical properties. To address this, we present an integrated workflow for high-resolution 3D geomechanical modeling to optimize hydraulic fracturing design. The methodology begins with developing a centimeter-scale mechanical profile to construct a high-precision 1D Mechanical Earth Model (MEM). This detailed 1D model is then upscaled and embedded into a 3D geomechanical model, which explicitly incorporates seismically interpreted faults and discrete fracture networks. This workflow was applied to optimize stimulation treatments in the Bai Jiantan Formation, with a detailed case study on the Bai818 well and representative offset wells (84009, D84005, 84010). Hydraulic fracturing simulations were performed at various pumping rates (0.8, 0.6, 0.4 m3/min for Bai818) to identify the most effective design. The simulation results confirm that the hydraulic fractures propagate perpendicular to the minimum horizontal stress direction of 135°. Furthermore, a stress sensitivity analysis was integral to the process, ensuring operational safety and borehole stability throughout the design. This study demonstrates that the presented integrated workflow provides a robust and precise account of the hydraulic fracturing operation, directly addressing the challenges posed by reservoir heterogeneity. The workflow establishes a critical foundation for optimizing stimulation designs and enhancing recovery in complex unconventional reservoirs.