CO2 storage resource estimates in unconventional reservoirs: insights from a pilot-sized storage site in Svalbard, Arctic Norway

摘要: Storage capacity is a key aspect when validating potential CO2 sequestration sites. Most storage projects, for obvious reasons, target conventional aquifers (e.g., saline aquifers, depleted hydrocarbon fields) with good reservoir properties and ample subsurface data. However, non-geological factors, such as proximity to the source, may require storing in geologically “less-than-ideal” We here present first-order resource estimate of an unconventional unit, naturally fractured, compartmentalized underpressured siliciclastic aquifer located at 670–1,000 m below Longyearbyen, Arctic Norway. Water injection tests confirm injectivity reservoir. Capacity calculations, based on US DOE guidelines estimation, were implemented stochastic volumetric workflow. All available data used specify input parameters their probability distributions. The areal extent poorly constrained, encouraging scenario-based approach. Other high-impact influencing estimates include saturation, density efficiency factor. hydrodynamic effects are accounted by calculating probable factors (0.04–0.79 %) fully closed system. results ultimately linked chosen scenario, two orders magnitude difference between scenarios. fracture network contributes up 2 % final volumes. derived workflow validates sites initial feasibility assessments, be applied aid decision making other significant uncertainty.