CO2 Geological Storage Through Adsorption in Organic-Rich Shales: A Case Study of Irati Formation Shales from the Paraná Basin, Brazil

Abstract

Geological sequestration of carbon dioxide (CO ) can represent an effi cient and safe long-term storage of this greenhouse-contributing gas. When applied to shales, CO injection can enhance shale gas recovery (CO -ESG) and contribute to CO abatement through geological storage. Shale is considered an unconventional reservoir due to its reduced permeability, consequently CO storage in shales has peculiar characteristics: storage through adsorption into the microporosity of organic particles and clay minerals. The effi cacy of CO adsorption and CH desorption processes drive CO storage capacity and hydrocarbon production of organic-rich shale. Therefore, understanding gas sorption patterns in shale and how these are aff ected by its organic and inorganic composition is essential to evaluate shale's CO storage capacity.organic matter quantity, type and maturation