Deltas play an important role in the energy transition for their potential in subsurface applications like geothermal applications and Carbon Capture and Storage. During delta formation, the interplay between coupled forcings governs the internal architecture of the delta, leading to heterogeneity in the subsurface, which is critical for subsurface applications, as it affects fluid flow, heat transport and storage capacity and makes modelling essential for understanding the internal structure of the delta. This study uses the Roda Sandstone (the Roda X) as a case study, chosen for its well-preserved stratigraphy and documented lobe-sublobe hierarchy. This research evaluates whether DeltaRCM, a Reduced-Complexity Model, can produce a delta model of stratigraphy that is comparable to the Roda X, with an emphasis on the internal lobes. The research compares the modelling results from DeltaRCM with those from the existing Delft3D model and field data, using both surface and subsurface metrics. Under the parameter settings in this research, DeltaRCM generates delta models with strong channel incisions rather than distributary, lobe-like geometries, which do not resemble the lobe–sublobe hierarchy documented in the Roda X. The findings suggest that DeltaRCM requires further refinement or parameter adjustment to reproduce realistic lobe structures before it is used for subsurface applications. ... Read more