Seismic Data Based Fracture Pressure Prediction Method and Application

Effective prediction of formation fracture pressure plays an important role in analyzation of wellbore stability, rational hydraulic fracturing design, reservoir stimulation, and safe drilling operations. However, current methods such as rock sample fracture tests and logging data estimation have limitations of spatial discontinuity. Considering the impact of tectonic stress on the magnitude of horizontal in-situ stress, we propose a novel method obtaining three-dimensional fracture pressure based on seismic data in this paper. This method is applied to a thin reservoir layer in PZ gas field, which suffers well influxes, wellbore losses, block falls, and stuck pipe incidents because of complex geological conditions. After pre-stack seismic inversion, rock strength parameter prediction and formation pressure prediction, the predicted fracture pressure from seismic data coincide with the logging interpretation results, validating the feasibility and reliability of the proposed method. The application of the method provides reliable reference data for horizontal well design and fracturing operations in tight reservoirs.