《Table 1 The distribution of magmatic rocks in wells》

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《"Tertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea"》

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Based on seismic，gravity and magmatic data，geochemical data，and isotope chronology data（K–Ar and U–Pb methods），three episodes of Cenozoic volcanic activity have been identified by previous researchers.The activities include two kinds of intrusions and eruptions，forming intrusive rocks and volcanic rocks dominated by intermediate acid rocks，including Early Eocene emplacement of intermediate-mafic igneous rocks，Late Oligocene emplacement of intermediate-felsic magmatic rocks，and emplacement of Miocene magmatic rocks（Shen et al.2001）（Fig.2，Table 1） .In particular，the Late Oligocene intermediate-felsic magmatic rocks penetrate through the T30 reflection layer（33.7 Ma）and intrude into individual seismic sequences in the form of dykes.The intense magmatic episode in the Miocene resulted in intrusions and magma flows along the T20group bedding surfaces.