Geological Interpretation Of Integrated Geophysical Profile In Songliao Basin,NE China

Songliao basin is rich in oil and gas resources,and has made great contributions to the country's economic construction.The shallow oil and gas reserves are declining,and people put forward the goal of finding deep oil and gas resources.However,in recent years,most of the geological and geophysical researches on Songliao basin have been conducted for shallow strata,and few studies have been done on deep strata.Moreover,the study of deep strata is also a single geophysical method,and there has been no heavy magneto mechanical seismic comprehensive geological interpretation at present.For this purpose to explain the comprehensive geophysical profile of Songliao Basin,this paper collects the Songliao basin basement rocks of the gravity and magnetic characteristics and electrical characteristics,based on the full investigation of Geology and Geophysics of the Songliao Basin,carried out a heavy-magnetic-electric-shock profile research work.Research on magnetotelluric sounding profiles,this paper used respectively with forward modeling comparison model of horizontal layered model of high resistance and low resistance marginal basin basin,influence of low resistivity characteristics test of Songliao basin is subject to the margin of the basin.Secondly,the two-dimensional magnetotelluric OCCAM inversion method is studied.Study on gravity and magnetic exploration profile,this paper carried out the low density and high density of two-dimensional gravity anomaly exist abnormal forward modeling,and then study the theory of abnormal body,block and ladder layered medium model,to test the reliability of regularization inversion method of smooth constraint.The work of magnetic force and two-dimensional inversion of magnetotelluric data,gravity,were obtained from inversion profile density,magnetic susceptibility and resistivity,the comprehensive study of them and the seismic profiles found in Songliao Basin,gravity anomaly,magnetic anomaly,electric anomaly and the wave speed shows the characteristics of good relationship.The density and magnetic susceptibility are well stratified,and the density of shallow layer is not very different.The gravity anomaly is mainly affected by the difference of basal density.It is found by magnetic susceptibility inversion profile that the magnetism in shallow and deep layers is higher,and that in the Middle Paleozoic there is no magnetism.By studying the resistivity inversion section,middle layer resistivity profiles is very low,based on the seismic profiles,this paper believes that this is mainly because of the metamorphic core complex arch,the top in the drag of magma migration under development for a series of mylonite of ductile shear zone in rock drilling heart indeed found a lot.In the study of the interpretation of gravity magnetic electric shock comprehensive profile,it is found that a variety of geophysical prospecting methods can effectively reduce the inversion multiplicity and improve the reliability of the inversion results.