“…Cavernous, sometimes mineralized solutional voids attributed to hydrothermal speleogenesis have been described in quartzites and skarns in Kyrgyzstan (Kornilov, 1978; Leven, 1961), USA (Colorado; Lovering et al, 1978) and Ukraine (Tsykin, 1989). Silicified reservoirs are typical of the lower Cretaceous pre‐salt sequences of the Campos and Santos basins in Brazil (Lima et al, 2020; Lima & De Ros, 2019), the Kwanza‐Congo Basins of Africa (Poros et al, 2017; Teboul et al, 2019) and the Parkland gas field in Canada (Packard et al, 2001). On the basis of petrographic, isotopic and fluid inclusion studies, pervasive silicification and porosity enhancement processes in these basins were ascribed to the circulation of high‐temperature fluids (De Luca et al, 2017; Girard & San Miguel, 2017; Lima et al, 2020; Poros et al, 2017; Teboul et al, 2019).…”