川东北元坝地区上三叠统须家河组二段砂体充填特征及展布规律
천동북원패지구상삼첩통수가하조이단사체충전특정급전포규률
Sand-bodies Filling Characteristics and Distribution Rule of Member 2 Xujiahe Formation in Yuanba Area'Northeastern Sichuan Basin
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