《Table 2.Statistics on basic characteristics of medium-and large-sized marine carbonate gas fields i

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《"Distribution and exploration direction of medium-and large-sized marine carbonate gas fields in Sichuan Basin, SW China"》

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Note:The reserves in the table refer to the proven geologic reserves；according to Regulation of Petroleum Reserves Estimation（DZ/T 0217—2005），the gas fields are classified according to the proven recoverable reserves:more than or equal to 2 500×108 m3

By the end of 2017，marine carbonate strata in Sichuan Basin have been proved to have 23 435×108 m3 geologic reserves.Eight large and extra-large gas fields have been discovered in the marine carbonate strata in Sichuan Basin，with total proven geologic reserves of 17 278×108 m3 accounting for 73.7%，additionally，there are 45 medium-sized gas fields，with proven natural gas reserves 4 962×108 m3，accounting for21.2%.The total proven natural gas geologic reserves of medium-and large-sized gas fields account for 94.9%of that of all gas fields（Table 2）.Large and extra-large gas fields are mainly distributed in the Sinian，Cambrian，Carboniferous，Permian Changxing Formation and Triassic Feixianguan Formation.