No-compromise 3D finite-element modeling of borehole DAS data

We present a no-compromise modeling framework for borehole seismic applications, utilizing full-physics 3D finite-element simulations with adaptive meshing. This approach enables detailed and realistic modeling of complex wave phenomena in boreholes, including tube, body, and slow Krauklis waves in fluid-filled fractures. Our study employs a cross-well geometry inspired by upcoming hydrogen injection tests at the Devine Test Site to validate this capability across multiple physical interactions. By explicitly modeling the casing, completion, fluid coupling, perforations, and fiber configurations, we demonstrate how the complexity of the wavefield—particularly tube-to-Krauklis wave conversions and realistic DAS responses—is influenced by borehole construction and fluid coupling details. The numerical results exhibit strong sensitivity of wavefield attributes to hydraulic connectivity, fracture geometry, and DAS cable layout.