The Lorraine carboniferous basin (France) as a new target of regional gas resource for the energy transition strategy?

International audienceKnowledge of the nature of the deep-seated geological structures of Europe is a strategic aspect of the energy transition. Indeed, the existence of underground resources as well as geological features able to serve as energy storage sites becomes increasingly important. Natural gas has been classified by the European Union as sustainable investment and current dramatic events underline how energy transition efforts can be jeopardized without secured supply. In such background, the identification of local/regional gas resources is important. In Lorraine (North-East France), the Carboniferous basin play an important resource of coal bed methane (CBM). Currently, new exploration campaigns are being carried out through the research program REGALOR (2018-2023) and new accurate data are offered by La Française de l'Energie. Therefore, new research contributes to a better understanding of the sedimentary pattern and thermal history of the basin. The Lorraine Carboniferous Basin is about 200 km long, 80 km wide. The sedimentary infilling is made up of 8 km of fluvio-lacustrine deposits. The Westphalian strata (315-308 Ma) which host most of the coal deposits are overlain by fluvio-lacustrine series of Stephanian (307-302 Ma) in which coal is far lesser abundant. Carboniferous-Permian strata are buried under a 500 to 1800 m thick Mesozoic cover of 500m to 1800m (Donsimoni, 1981; Izart et al., 2016)

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