The Application Research Of Gravity And Magnetic Data Processing In Qiabuqia Area Of Qinghai Province

In recent decades,as a kind of traditional measuring method of geophysical prospecting,gravity and magnetic prospecting has entered into a high precision measurement and automatic interpretation of new phase,with high-precision gravity and magnetic measurement instruments constantly updated and widely applied,and the rapid development of computer technology.Whether in theory or in application,gravity and magnetic exploration is relatively mature in many geophysical exploration methods.Gravity and magnetic method has many advantages: economy of low cost,large range of exploration,high efficiency,speed,coverage widely applied.With the rapid development of economy,energy shortage situation is imminent.Whether to take the path of sustainable development of economic society and protect the earth's ecological environment to the survival of humans,the development of new energy has great strategic significance.As a clean energy,geothermal resources can relieve the tense situation of China's energy,and protect the natural environment.This article through to process the gravity and magnetic data of Qiabuqia area of Qinghai province,draw the fault information in the area,and delineate the hot dry rock target areas,and find the relationship between gravity and magnetic anomaly and hot dry rock.The concrete research content is as follows:In this paper,we study the theory of singular value decomposition,and explore the possibility of singular value decomposition(SVD)to apply in the potential data denoising field.This paper proposes a judging method of effective order,and establish gravity model to verify the feasibility of the method denoising.Finally we discussed the advantages and disadvantages of singular value decomposition denoising.Carry on theoretical analysis systematically on the field separation methods like upward continuation and the multi-scale wavelet analysis,the Parker-Oldenburg interface inversion method,the boundary identification methods like vertical derivative,total horizontal derivative of tilt angle,the normalized standard deviation,and the field of normalized difference.Through model test,for a variety of boundary identification method were analyzed,by adding the regional field,discuss the change characteristics of each method and summarizes the method of application effect.To process the gravity and magnetic data of Qiabuqia area of Qinghai province,on the basis of the singular value decomposition denoising,did analytical continuation,the separation of potential field processing,and parse the data from different aspects;Respectively using gravity and magnetic anomaly to calculate the basement depth and undulation,and a fault information extraction was carried out.Finally using the results of the various methods and in combination with geological information judged the fracture structure in the study area,delineated the hot dry rock target area.