Synthesized Analysis Of Positive And Negative Inversion Structure Basin

This paper makes a quantitative analysis of some typical inversion structures which appear on the seismic prospecting sections in Songliao Basin.Growth index indicates that Honggang, Gudian, Songzhan are coincident on the extension of inversion and the time of extrusion; and the speed varies with the stratum and place.Stratigraphic separation points out that Honggang,Gudian's basal reference units have small amounts of reverse separations, which may change from reverse to normal and back to reverse through the null point two times; while Songzhan's separation of the basal reference unit is close to zero on the negative direction,and it shows that fault separation of synextensional units decreases gradually upwards,though not very distinctly.The three places have different inversion conditions respectively,and Songzhan is with the highest inversion rate,Gudian middle and Honggang smallest.The analysis of displacement-distance reflects distinctly the conditions of using parameters in inversion rate,which supplies further information to understand the inversion conditions.Otherwise,this paper interprets the flower structures,emerging on the seismic prospecting section in Songliao Basin, from various aspects, such as the fault, drape, structure features, anticline, excursion belt etc. Through framing inversion structure basin stratigraphic sedimentary formation model,this thesis uses backstripping restoring each time's thickness of sedimentary formation,then obtains total settlements and tectonic descents,plots sedimentation history chart,simulated restores inversion structure strata sedimentation history and carries on analyses. Adopting means of vitrinite reflectance,this thesis simulates basin thermal history and carries out analyses. Through the medium of type model numerical simulation,this thesis approaches the sedimentation history and thermal history of songliao basin inversion tectonic .