Abstract:

The comprehensive interpretation of 6 deep seismic sections of 1 354.6 km long and 15 s deep has revealed the important geological characteristics of strata,intrusive mass and tectonics in deep Songliao Basin.The interpretation results indicate that Songliao Basin consists of upper curst layer and lower crust layer,the boundary between the two layers is on the top of network of reflecting horizon.According to the amplitude of vibration,wave group continuity and forms of seismic waves reflected on the 6 sections,the Meso Cenozoic,Upper Paleozoic,Predevonian,Precambrian,intrusive mass and the basic magma basement could be identified.Especially the special geological body of igneous rock-the mantle thermal diapir found in deep crust layer bears close relation to gas distribution.It is an important evidence of searching for inorganic natural gas.It has been proved that the deviation mirror image between moho swell and the basin's depressed center,the listric faults and detaching zones developed in the basin are all resulted from simple shear action.

Key words: Songliao Basin, deep seated structures, seismic exploration, tenacious shacer zone, mantle thermal diapir