Abstract:

Comprehensive analysis by combination of basin tectonism during basin formation and evolution with the basin filling and reforming is the key to reveal the configuration of depositional systems and the source, reservoir and seal in the inland tectonically active basins. The development and distribution of different order tectonic unconformities and sequences determined the basic characteristics of the chronstratigraphic framework. The polyphasic and episodic tectonism of these basins usually had a significant influence on the regional depositionerosion cycles and the depositional patterns. It is the key for reconstruction of the basin filling patterns to document the control of the activity of syndepositional structures and the paleostructural framework on the sediment disposal and the variation in tectonic paleogeomorphology. The structural slope break zones usually constrained the development of distinguish facies zones or depositional systems tracts, such as lowstand deltaic or lacustrine fan systems in Mesozoic and Cenozoic rift lacuastrine basins and reef and bank facies zones in the Paleozoic carbonate platform in Tarim Basin, and comprise economically important plays in the basins. The formation and alteration of uplifts and depressions resulted in the complex stratigraphic architecture and unconformity configuration, which significantly constrained the formation and distribution of stratigraphic or structural-stratigraphic traps in the large superimposed basins in the western China.

Key words:  tectono-stratigraphy, structural slope break zone, unconformity distribution, basin filling pattern, tectonically active basin