3D Modeling of Complex Hydraulic Fracture Geometry from the Kamioka Field Test

This paper presents a high-fidelity 3D hydraulic fracture model based on the phase-field approach, following a field pilot test conducted at the Kamioka mine in central Japan. The phase-field method represents fractures using a continuous variable that transitions from 0 (fractured) to 1 (intact). This approach eliminates the need for computational meshes to conform to discontinuous fracture planes. This method enables efficient tracking of complex hydraulic fracture geometry evolution in three dimensions, particularly when modeling interactions with natural fractures. The simulated fracture morphology shows non-planar propagation interacting with pre-existing natural fractures. Our numerical approach captures these complex fracture behaviors, which have also been observed in the field data. Analysis of microseismic event locations relative to observed fracture geometry enhances understanding of the connection between seismic activity and physical fracture formation. This study advances understanding of how complex 3D hydraulic fractures interact with natural discontinuities. The findings enhance predictive capabilities for reservoir stimulation design in complex geological settings where conventional planar fracture models may be inadequate. This integrated approach combines numerical simulation with field-inspired modeling. It offers valuable insights for improving hydraulic fracturing operations in subsurface engineering applications.