Marine Geomechanical Approach to Well Trajectory Optimization in Fractured Reservoirs: A Case Study from the X Block, Zhujiangkou Basin

This study presents a geomechanics-driven marine approach for optimizing well trajectories in fractured offshore reservoirs, with a focus on the X Block of the Zhujiangkou Basin. The method integrates in situ stress analysis and fracture prediction within a three-dimensional geomechanical modeling framework, tailored to the complex tectonic and sedimentary characteristics of offshore environments. Multi-source geological and engineering data—including core observations, borehole imaging, well logs, and marine seismic interpretation—are synthesized to reconstruct the subsurface stress field and assess fracture development along potential well paths. Key geomechanical parameters, such as principal stress magnitudes and orientations, rock mechanical properties, and fracture propagation tendencies, are quantitatively evaluated to identify fracture-prone zones and mitigate drilling risks. This methodology enables dynamic adjustment of well trajectories to avoid high-stress zones while maximizing contact with productive fracture networks. A case study from a structurally complex marine fractured reservoir demonstrates the practical applicability of this approach, offering valuable guidance for safe and efficient offshore drilling design in geomechanically sensitive environments. The results highlight the significance of incorporating marine geomechanical insights into trajectory planning for enhanced reservoir development.