Forebulge migration and evolution of the Triassic in Tarim Basin
Tang Wu1,2, Wang Yingmin1,2, Zhang Lei3, Wu Jiapeng1,2, Sun Xijia4, Zheng Guichun1,2
1 State Key Laboratory of Petroleum Resource and Prospecting，China University of Petroleum(Beijing)，Beijing 102249;
2 College of Geosciences，China University of Petroleum(Beijing)，Beijing 102249;
3 PetroChina Coalbed Methane Company Limited，Beijing 100028;
4 Tianjin Branch of CNOOC Limited，Tianjin300452
Based on a large amount of logging and seismic data，and a comparison with Kuqa River outcrop，the characteristics of back-bulge strata and unconformities of the Triassic which developed near forebulge area in Tarim Basin are comprehensively analyzed，and then the forebulge migration and evolution are discussed.The results show that during the Triassic the forebulge had experienced three times reciprocating migration，with Early，Middle and Late Triassic once respectively.Many unconformities were developed in the back-bulge area，with maximum unconformity located at the bottom. During the earlier Early Triassic, the forebulge which migrated toward Tianshan Mountain was onlapped by back-bulge strata，with the strata being thinner to the north and a narrower foredeep left. However，during the late Early Triassic，the forebulge moved and uplifted toward craton，with nearby back-bulge strata severely eroded.Simultaneously，because of the blocking of forebulge，the foredeep couldnt connect with back-bulge zone，and the alluvial fan developed under mountains.The characteristics of two later migrations were similar to that of the Early Triassic，but the back-bulge and forebulge were separated during the Middle Triassic and connected during the Late Triassic.
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