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The thesis has been developed into two main areas: the elaboration of a 3D model of the Pisa basin stratigraphy, and the creation of a map of the flux of CO

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Academic year: 2021

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ABSTRACT

The Pisa basin has always been object of studies aiming the reconstruction of the stratigraphy and the identifications of aquifers. This study moves a step further on this research using advanced software to elaborate a support tool for the stratigraphic, hydrogeological and geochemical analysis.

The thesis has been developed into two main areas: the elaboration of a 3D model of the Pisa basin stratigraphy, and the creation of a map of the flux of CO

2

. The 3D elaboration has been developed combining the use of Strater 2 (Golden software) and Petrel E&P software platform (Schlumberger). The elaborated model has validated the previous stratigraphic models developed in the last decade. It offers the possibility to observe the Pisa basin main lithology and hydrogeological units until 200 m depth, covering a period from Pleistocene to Holocene.

This work was carried out in order to assess the geothermal potential of the water and sediment, and this will encourage the use of geothermal heat pump systems in densely populated areas that characterize the alluvial plain of Pisa.

In order to identify potential geothermal reservoirs, raise systems preferential fluid and fault systems, was employed geochemical survey that involves the measurement of the flow of Carbon dioxide.

The CO

2

map of the Pisa basin has been developed starting a sampling campaign in November 2012. The flux of CO

2

has been sampled with an accumulation chamber (LI-81000 LI-COR), which houses an infrared gas analyser (IRGA). The sampling design combines a systematic grid sampling with a judgemental sampling and consists of 130 sampling points. The values are elaborated on the ArcGIS 10.1 (ESRI) by mean of Geo-statistical Analyst tool. The interpolation of the data using the Kriging method creates a thematic map of the flux of CO

2

Pisa basin. The map has identified a low emission patch which has been found to correspond to a reclaimed swamp and greater emission area corresponding in the surface, mainly in sandy sediments of the flood plain, in the underground to a geothermal reservoir, housed, presumably, within the Mesozoic carbonate units of the Tuscan Nappe below the Neogene deposits.

Furthermore, it has been possible also to calculate the CO

2

emission for each geochemical

population of the area of study.

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