College of Instrument Science and Electrical Engineering, Jilin University, Changchun 130026, China

Based on the analysis of the influences of hydraulic fracturing on the mechanical parameters of reservoir rocks, a simulation method is proposed to calculate the stress field distribution. By estalishing the in-situ stress field model and hydraulic fracturing induced stress field model of horizontal wells, and using the hydraulic fracturing logging parameters of actual reservoir, the stress field distribution induced by fracturing cracks is calculated. The simulation results show that fracturing induced artificial cracks have a great influence on the reservoir stress field distribution; reservoir stress after fracturing mainly accumulates around the cracks, the farther it is away from the cracks, the less the stress accumulates; the fracture length also affects the distribution of reservoir stress field, the longer the crack is, the slower the crack induced stress field decreases.