Vol. 20 No. 3 (2026): June

Cover image by Cunqi Jia on pages 213–226. The image illustrates dynamic Mohr–Coulomb evaluation of natural fractures and faults in deep shale under hydraulic fracturing induced stress superposition. Multistage hydraulic fractures redistribute the three-dimensional stress field and pore pressure, altering stresses on nearby discontinuities and defining reactivation risk zones. The proposed framework provides a quantitative basis for identifying fracture activation risks and mitigating casing deformation in deep fractured shale reservoirs.