Abstract: We explored the characters of seismic wave groups of the Carboniferous in the eastern Luliang uplift of Junggar Basin under the guidance of the latest drilling and seismic data.Accordingly,the tectono-stratigraphic sequences were identified in the study area.Four main reflection interfaces,namely T₀,T₁,T₂ and T₃,were identified based on analysis and correlation of synthetic seismograms of 30 wells.Among them,the interface T₀ and T₂ are characterized by high amplitude,good continuity,and stable waveform of reflective waves,thus are the main regional unconformities and the critical key beds of comparison in the area.Based on that,the seismic wave group characters of each seismic stratum among the four interfaces were summarized.We thus knew that the seismic wave groups between T₁ and T₂ have low amplitude,medium-low frequency and moderate-poor continuity,and wedge-shaped reflection,thus can be used as the key beds of comparison in the eastern Luliang uplift.Then we traced the unconformities,analyzed the outcrop,paleontological and chronological data,and subsequently subdivided the Carboniferous herein into four tectonic layers.From the bottom to the top,they are the lower sedimentary tectonic layer C₁-s(Dishuiquan Formation),lower volcanic tectonic layer C₁-v(Songkaersu lower group),upper sedimentary tectonic layer C₂-s(Songkaersu upper group) and upper volcanic tectonic layer C₂-v(Bashan Formation).The results can be summarized as follows:(1)the distribution of tectonic layers in the Carboniferous is controlled by the basement,tectonic setting,location of development and later modification.Their thickness is relatively large in the intra-arc fault depression and fore-arc basin,while is relatively small on the island arc convex;(2) two tectonic compression activities developed at the end of the Early and Late Carboniferous respectively lead to the denudation of the strata between C₁-v and C₂-s and that on top of the C₂-v,and the inversion of the fault depression in the Carboniferous.

Key words: character of seismic wave group, tectono-stratigraphic sequence, Carboniferous, eastern Luliang uplift, Junggar Basin