Coupling Topological Characteristics of Fault Networks and CO2 Contaminant Along the Tatau Half Graben Province

We investigate the topological characteristics of Late Miocene interval fault networks from the Tatau Half Graben Province using 3D seismic reflection data to better understand the complex fault network in this region. The complex multi-phase extension in this region indicates the spatial variation of the fault network topology. The overall topology of the fault network is I- and Y- nodes with very few X- nodes, and I-I and I-C branches dominate. In general, where the fault intensity is high, the corresponding connection per branch (CB) is also high. Furthermore, this study suggests that there is a strong spatial correlation between high-intensity and high-connectivity faulting with high CO2 concentration. Fault connectivity both vertically and laterally due to multiple deformation phases also plays an important role in providing an easy pathway for CO2 from source kitchen to shallow younger reservoirs. Oligocene-Early Miocene rifting event and later strike-slip deformation during Middle-Late Miocene time is likely to control the fault connectivity (vertically and laterally), especially the ones reactivated along deeper tectonic trends closer to CO2 sources.