The Application of Volumetric and Dynamic CO2 Storage Resource Estimates to Deep Saline Systems
One method under consideration to reduce anthropogenic CO2 emissions is CO2 storage in deep saline formations (DSFs). Several methods exist to estimate the CO2 storage resource potential of DSFs, but most are based on volumetric approaches that ignore the effect of site-specific, dynamic factors such as injection rate, injection pattern, and pressure interference. Additionally, these methods have not been validated through real-world experience or full-formation injection simulations. As a result, they may over- or underestimate the effective storage resource potential. The EERC, in collaboration with the IEA Greenhouse Gas R&D Programme (IEAGHG) and the U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL), has conducted an investigation comparing volumetric and dynamic storage resource estimates for two deep saline systems: the Minnelusa Formation in the Powder River Basin, USA, and the Qingshankou and Yaojia Formations in the Songliao Basin, China. For each system, volumetric and dynamic effective storage resource estimates were determined. First, a 3D geocellular model was built using publicly available data. Second, the models were upscaled, and an effective volumetric CO2 storage resource estimate was calculated. Third, 12 CO2 injection scenarios were developed and conducted for each system. Finally, the simulation results, representing the dynamic storage resource estimate, were analyzed and compared to the volumetric estimate. The results show that a volumetric approach can be used to reasonably estimate a formations CO2 storage resource potential, provided that the appropriate methodology and storage efficiency terms are used and that the length of CO2 injection is considered. Additionally, factors such as geologic heterogeneity, water extraction, and pressure buildup can significantly impact storage efficiency.View/Download Document
Event/Meeting Information
PCOR Partnership 2014 Annual Membership Meeting
9/16/2014
Denver, CO