Abstract：With the newly seismic data，drilling，regional geological data and the basis of previous studies，this paper establishes a district sequence stratigraphic framework of the Sichuan Basin and adjacent areas.The tectonic-depositional environment maps of the Late Sinian are compiled and the tectonic-depositional evolution history is studied.The tectonic-depositional environment is controlled by the structure of basement with inheritance.A large-scale carbonate platform deposition started at the Late Sinian.From west to east，the sea level changed from shallow to deep,with the sediments changing from mudstones of residual land, carbonate platform and platform margin-slope eastwards, to sedimentary siliceous rock of deep water basin.The strike of each facies belt is generally from southwest to northeast.During the depositional stage between the sedimentary periods of the Member 1 and the middle of Member 2 of Dengying Formation of Upper Sinian，this area was filled up by sediments.The flattened intracratonic uplift was forming on the intracrationic basin during the depositional periods between the end of Member 2 and the Member 3 of Dengying Formation.And during the Member 4 of Dengying Formation，the platform boundary moved eastward with the decline of the sea level.Affected by two periods of Tongwan tectonic movement，some areas of central basin formed palaeokarst unconformity during the depositional periods of the Members 2 and 4 of Dengying Formation，and the Members 3 and 4 of Dengying Formation suffered a strong denudation in the western basin.The Dengying Formation is an important oil reservoir in Sichuan Basin and adjacent areas.
Li Yingqiang,He Dengfa,Wen Zhu. Palaeogeography and tectonic-depositional environment evolution of the Late Sinian in Sichuan Basin and adjacent areas[J]. JOPC, 2013, 15(2): 231-246.
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