Presentation by Jack Turney.
New Opportunities for CO2 Storage along the US Atlantic Margin: Geopotential Modeling of the Great Stone Dome and near-shore diapiric structures
The Great Stone Dome (GSD) is a post-rift igneous structure located ~100 km offshore along the US Atlantic Margin. Deformed Cretaceous sediments above and adjacent to the GSD are proposed targets for carbon dioxide storage, although the nature and composition of the structure are poorly understood due to limited well and seismic data. New high-resolution aeromagnetic and gravimetric survey data presented here reveal positive anomalies that are offset from each other by < 5 km, with the magnetic anomaly showing a north-south elongation. A combination of geopotential modeling, seismic and well data suggest the GSD is a dike swarm that widens as it shallows to a depth of ~2350 m. Forward and inverse modeling identifies ~2 km of uplift above the GSD with a diameter 56% larger than previous estimates, generating potential structural sediment traps to the north, south and west of the structure. The western flank is ~20 km closer to emission sources than other proposed injection sites. Additionally, a positive aeromagnetic anomaly ~25 km south of Long Island, may identify a similar diapiric structure named as the Minor Stone Dome (MSD), potentially providing a storage site proximal to the coastline on the tens of millions of tons-CO2 scale.
