Deep Geological And Structural Features Of The Yushu Region In The Southern Songliao Basin

Main study tasks of tectonic study of Yushu area in the southern Songliao basin:to verify the location, nature and occurrence of rift boundary faults, the of the rift basal undulating shape and buried depth of the top surface, the volcanic rock distribution characteristics in the faults, as well as collecting the geology, seismic, physical properties, drilling, gravity and magnetic electrical data of Yushu area. Use more advanced processing and interpretation methods to extract gravity and magnetic anomaly of fracture, volcanic, basement uplift and lithology. Combined with the geological properties, seismic, drilling and other exploration results to carry out quantitative calculation and geological interpretation, finally achieved the main geological results as follows:1、Main physical property characteristics of this area:Q-K1q is low-density layer. K1d is middle-density layer. K1yc-J3h are middle-to-high density layer and the basement high-density layer:volcanic rock in Yingcheng group and, Huoshiling have middle-magnetic property. The intrusive rock are middle-to-high magnetic body. Q-K1q have low resistivity. K1d-J3h have middle resistivity, and the basement has high resistivity. Volcanic rocks are locally high resistivity and intrusive rocks have special high resistivity.2、48deep basement faults are divided in the region.3、According to the formation magnetic layer, magnetic wavelet transform the details anomaly, vertical second derivative are used to delineate the volcanic rock distribution, which was divided into12volcanic rock distribution areas.4、Seismic T3, T4structural layer diagram was used to strip the gravitational effects of the strata above the ground-T4; use the result of plane gravity iterative inversion method and joint inversion method of gravity, electrical, seismic of13sections to prepare the figure of basement buried depth of the top surface;10I-class tectonic units were divided. 5-. Delineation some favorable local structures by using wavelet analysis, apparent depth filtering, gravity vertical second derivative anomalies and integrated gravity, magnetic, electrical data processing and geological interpretation results, and predict I-class (East slope belt of Heilin rift) and Ⅱ-class (Liujia tectonic belt) oil prospecting prediction.