Study And Application Of Boundary And Mass Centre Extraction With The Data Of Gravity

Through the development of nearly a century, the gravity exploration method hasbecome an important geophysical method. Gravity observations obtain the original dataafter the processing and interpretation of future can provide people with a wealth ofunderground geological structures. Gravity exploration methods have been widely used inthe deep crust structure, regional geological structure, geological mapping diagram,resources and energy exploration. The gravity data processing, the use of a lot of ways,which is commonly used, is the boundary and centroid extraction. The model of researchand practical application of this article analyze the advantages and disadvantages ofvarious methods, and be hope to provide effective means for the geological interpretation.Geologic body boundary is refers to the underground faults, the existence of certainphysical properties of different geological junction. The potential processing method hasits unique advantages. Border delineation is the field data processing compare commonlyused of a class method, the abnormal level and vertical guide number of such methodsusually use the direct use of gradient data is filtered of, such as the shadow of France, theoverall level of gradient mode, analytic signal, the level of other filters and verticaloblique derivative map. These methods are different forms of high-pass filter, so they atthe same time enhance the details of the field data, but also enhances the noise level,these methods are to extract geological boundary in two dimensions, but not be able totake full advantage of gravity exception information, it will lose a lot of details. Theintroduction of a new derivative operator of the field data enhancement, which is calledthe generalized derivative operator (the Generalized derivative operator, GDO), itsprinciple is the level of the field data and a linear combination of the vertical derivative,divided by the abnormal total gradient mode, the generalized derivative operator isdifferent from other methods, simply because it is not only in the two-dimensional spaceof potential field data, enhanced and it can be in three-dimensional space, the data isenhanced. Azimuth factor and elevation factor which is due to this method is joined, so itcan in the three-dimensional space would strengthen the role of directional sensitivity,and can be selectively enhanced in all directions of the boundary information, the authorsstudied a variety of boundary extraction method at the same time, the focus of thisunderground structure of the boundary enhanced gravity anomaly generalized derivative operator in the distribution on different structural characteristics in the model spreadsheet;that you would think the center of mass extraction of the subsurface structure,geophysical work has been plagued by, these methods can be broadly divided intoqualitative and quantitative inversion, not any other material information under thepremise, also the most effective use of gravity information is the focus of this articlecentroid extraction research. This paper selects these two types of representative themethods were compared.The contents of this article focus on the exception of border extraction and centroidextraction theory and its various methods of application conditions. The advantages anddisadvantages can be summarized as follows:1. Discusses the method used to extract the gravity anomaly boundaries and shape ofthe generalized derivative operator and nature. Operator through the test of the theoreticalmodel and the actual data demonstrates the effectiveness of the generalized derivativeoperator. Using this method to deal with the model, this approach to analyzethree-dimensional geological body, the gravity anomaly boundaries and shape extractionhave achieved good results, and prove that the generalized derivative operator methodand its properties can be widely applied explain the gravity anomaly constructed.2. In this paper, the canny operator in image processing and multi-scale waveletedge detection applied to the generalized derivative operator subgraph extractedgeological boundary. This combination has a directional sensitivity and accurateextraction boundary.3. Extract the density center of mass with the Euler deconvolution method. Icompared the advantages and disadvantages of the two methods, and pointed out theapplicable conditions of the various methods.4. In the actual data processing, in the Lao province of Gansu and Inner Mongolia silvitemine, with the processing of a variety of methods, I determine the distribution ofunderground abnormal body structure to obtain the better effect, and compared thephysical properties.