Fuel, 22 June 2013.
Julio Rodrigo-Naharro, Barbara Nisi, Orlando Vaselli, Matteo Lelli, Raul Saldaña, Carmen Clemente-Jul, Luis Pérez del Villar.
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, Spain and
CNR-IGG Institute of Geosciences and Earth Resources, Via G. Moruzzi 1, 56124 Pisa, Italy and
Department of Earth Sciences, University of Florence, Via G. La Pira 4, 50121 Florence, Italy and
CNR-IGG Institute of Geosciences and Earth Resources, Via G. La Pira 4, 50121 Florence, Italy and
Department of Chemical Engineering and Fuels, ETS Ingenieros de Minas, Universidad Politécnica de Madrid, C/Alenza 4, 28003 Madrid, Spain.
In the framework of a global investigation of the Spanish natural analogues of CO2 storage and leakage, four selected sites from the Mazarrón–Gañuelas Tertiary Basin (Murcia, Spain) were studied for computing the diffuse soil CO2 flux, by using the accumulation chamber method. The Basin is characterized by the presence of a deep, saline, thermal (∼47 °C) CO2-rich aquifer intersected by two deep geothermal exploration wells named “El Saladillo” (535 m) and “El Reventón” (710 m).
The CO2 flux data were processed by means of a graphical–statistical method, kriging estimation and sequential Gaussian simulation algorithms. The results have allowed concluding that the Tertiary marly cap-rock of this CO2-rich aquifer acts as a very effective sealing, preventing any CO2 leak from this natural CO2storage site, being therefore an excellent scenario to guarantee, by analogy, the safety of a CO2 storage.