Pore‐Scale Fluid Dynamics Resolved in Pressure Fluctuations at the Darcy Scale

Abstract Complex pore‐scale dynamics have been observed during multiphase flow through porous rocks. These are not incorporated in large scale models for the migration and trapping of subsurface fluids such as CO 2 or hydrogen. We show that fluctuations pressure measured at core‐scale (centimeters) can reflect fluid displacements (millimeters). The spectral characteristics data shown to depend on dynamics, size rock sample, heterogeneity pore space. results data, transformed into time‐frequency domain using wavelets, provides information about across scales, otherwise challenging acquire.