Study Of Contrast On Inversion Method Of Edge Parameter Of Two Dimensional Body

In recent years,with the reduction of shallow resources,deep exploration of resources has become the focus of geophysical workers who are facing more and more demanding.Under the new challenge,the future task of geological work is mainly to find hidden ore,deep mine,to be difficult to identify minerals and deep oil and gas reservoirs with a variety of structural forms of oil and gas reservoirs.Therefore,in this background,the field source of geometric parameters and physical parameters inversion research is particularly important.In this paper,the second body edge parameter inversion method is studied.The second body edge parameter inversion method mainly includes Werner deconvolution method,total gradient method,local wave number method,Euler deconvolution method,Tilt_depth,and curvature property inversion method.According to the theoretical model,several methods can be divided into three categories: point source class,second sheet body and thick contact type.The point source class method includes Euler deconvolution and curvature properties.The theoretical anomaly of this method is the point source anomaly.The theoretical test shows that the inversion result is not affected by the model magnetization.The accuracy of the inversion results is highest.The fitness test shows that the curvature properties can adapt to more geological bodies model,whose inversion accuracy is higher,but can not invert the horizontal position of the model body;the second sheet body method includes Werner deconvolution,total gradient(analytic signal amplitude)and local wave number.The theoretical anomaly of this kind of method is the sheet body with infinite depth.The theoretical test shows that the inversion result is not affected by the inclination and magnetization of the sheet.The accuracy of the second sheet model is higher,and the adaptability test shows that the sheet class of method has good adaptability to various models The thick contact band method has Tilt-depth method.The theoretical model of the method is a vertical thick contact with infinite depth.The theoretical test and adaptability test show that the inversion result of this method is influenced by the inclination of the thick contact zone,and the universality is poor and the application is single.In order to effectively determine the geological model of the work area by using the structural index estimation technique,the inversion results can be screened to improve the inversion accuracy.The stability of the solution is improved by the conjugate gradient method.In the actual data processing,the continuations of the derivative technique can effectively suppress the noise,improve the accuracy and stability of the inversion results,and enhance the practicability of the second body edge parameter inversion method.The total gradient and local wave number which are able to invert the depth and boundary position of the model body can be adapted to the larger model body.The curvature property method can invert the depth of the model body to adapt to the larger model body,but can not invert the horizontal position of the model body,The Werner deconvolution method and the Euler deconvolution method is lower,Tilt_depth is only adapted to the inversion of the vertical contact.Finally,the above-mentioned methods are used to invert a profile inside the Wanan basin,and the characteristic point edge parameters on the profile are obtained.The inversion results are in agreement with the actual geological features.