Exploring Variations in Orientation and Velocity of Hydraulic Fracture Propagation in Denver-Julesburg Basin

Summary This research explores the variations in hydraulic fracture (HF) propagation orientation and velocity within a zipper-fractured area of the Denver-Julesburg (DJ) Basin. By using a comprehensive analytical approach that integrates crosswell low-frequency distributed acoustic sensing (LF-DAS) strain signals, 3D seismic images, borehole image logs, gamma ray (GR) logs, and zipper-fracturing completion sequences, the study examines the dynamic responses of HF propagation under various geological and stimulation conditions. A detailed field case study was conducted across seven horizontal wells, with the entire hydraulic fracturing process monitored through fiber optics installed in two offset horizontal wells. Results from this study reveal significant variations in HF propagation behavior, likely due to pre-existing natural fractures, stress anisotropy, completion sequence, and fault impacts. These findings contribute to a better understanding of fracture mechanics in unconventional reservoirs, thereby informing more effective hydraulic fracturing strategies. This work ultimately provides crucial insights that can guide future optimization of hydraulic fracturing techniques in complex geological settings within and beyond the DJ Basin.