A study of natural analogues for predicting the performance of a CO 2 geological storage: the experience from a natural
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ORIGINAL ARTICLE
A study of natural analogues for predicting the performance of a CO2 geological storage: the experience from a natural CO2 reservoir (Gañuelas‑Mazarrón Tertiary Basin, SE Spain) Julio Rodrigo‑Naharro1 · Luis Pérez del Villar1 Received: 3 April 2020 / Accepted: 9 September 2020 / Published online: 17 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In the framework of a Spanish project focused on carbon capture and storage technologies, the Gañuelas-Mazarrón Tertiary Basin (SE Spain) was studied as a natural analogue of a CO2 reservoir affected by anthropogenic leakages. It has been accepted that the main objective of natural analogue studies is to predict the long-term performance of a natural C O2 reservoir to be extrapolated to the operation of a C O2 deep geological storage, but these studies can also provide valuable information to select a site for C O2 storage. Thus, the comprehensive study performed in this Spanish basin has allowed the establishment of a guide to be applied to other similar natural systems with deep saline aquifers that are able to store C O 2. This guide comprises 5 phases: (1) the compilation of existing information from the site; (2) the geological and structural study of the natural C O2 reservoir; (3) the characterisation of the main components (waters–rocks–gases) of the natural C O2 reservoir; (4) the identification of analogies between the natural C O2 reservoir and a potential site for C O2 geological storage; and (5) the implications for the long-term behaviour and safety of a C O2 storage system. Whilst the three first stages are well known since they are exclusively focused on the site characterisation, the latter two are poorly developed. For this reason, it has been considered convenient to go deeper into both the identification of analogies and the assessment of their performance in storing C O2. The main results of this study are aimed at elaborating a practical guide for regulatory agencies that are responsible for making decisions about sites that have been selected for anthropogenic CO2 geological storage. Keywords CO2 geological storage · Natural analogues · Performance assessment · Betic Cordillera (Spain)
Introduction Carbon dioxide ( CO2) is a greenhouse gas that naturally exists in the atmosphere, but its concentration has been increasing since the beginning of the First Industrial Revolution in the early nineteenth century (Mackenzie et al. 2001) mainly due to the burning of fossil fuels. These emissions are likely to be the most important cause of human-induced climate change throughout the world. One option to reduce CO2 emissions to the atmosphere is the development of carbon capture and storage (CCS) technologies, which are mainly focused on large industrial * Julio Rodrigo‑Naharro [email protected] 1
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Dpto. de Medio Ambiente, Avda. Complutense 40, 28040 Madrid, Spain
emission sources but t
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