《Table 4 Reservoir types and corresponding signatures of different origins of Dengying Fm.》

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《"A Model of Hydrothermal Dolomite Reservoir Facies in Precambrian Dolomite, Central Sichuan Basin, SW China and its Geochemical Characteristics"》

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Note:Qtz，Quartz；SD，saddle dolomite；Gn，Galena；Sp，sphalerite；Py，pyrite；Fl，fluorite；VS，vadosesilts；HC，hanging cements；BT，botryoidal texture；CD，crystalline dolomite.*The data in the table are average. (data cited from Huang Zhicheng et al.，1999；Zhan

Previous research shows that the distribution of 87Sr/86Srvalue ranges from 0.7085 to 0.7087（average value=0.7086，n=3）in marine limestone of Dengying Formation and in micritic dolomite those values range from 0.709123 to 0.709971，respectively（average value=0.7096，n=5）（Yang et al.，1999）.By comparison，the test results of this paper illustrate that the 87Sr/86Sr value of micritic dolomite ranges from 0.7089 to 0.7097（average value=0.7092，n=5）that is similar to previous research；the87Sr/86Sr value of fine-medium dolomite ranges from 0.7103 to 0.7106（average value=0.7105，n=4）；the 87Sr/86Sr value in saddle dolomite ranges from0.7114 to 0.7132（average value=0.7119，n=7）.Therefore，fine-medium dolomite and especially the saddle dolomite have higher 87Sr/86Sr value，compared to marine limestone and micritic dolomite（Table 1）.This phenomenon is caused by the reaction of hydrothermal fluids with clastic sediments and basement rocks containing mud and/or feldspar.The greater the water-rock reaction between hydrothermal fluids and carbonate is，the higher the enrichment of radioactive 87Sr is（Qing et al.，1992；1994）.