Magnetic Potential Field Conversion Method Research And Application

Magnetic potential field conversion processing in magnetic exploration has an important status in the data processing and interpretation, to complex to simple anomaly, so as to meet the needs of some interpretation methods; The observed anomalous decomposition and transformation, which can be more convenient the use of information, provide more explanation method, improve the effect of interpretation; Highlight useful information and suppress interference, distinguish the nature of the anomaly, and provide the occurrence, etc. Potential field conversion processing conversion, it includes the content of the space(up, down analytical continuation, topographic correction); The conversion between different component; The conversion between different magnetization direction(to the pole); Each derivative conversion,(local anomalies and the division of regional anomaly, filtering, etc.).Upward continuation and downward continuation of two main contents. Namely the location-field transformation, the continuation of the essence is to use the observations of the surface potential field value, using mathematical method reduced the space a certain height or a certain depth below ground potential field value of the position. Upward continuation to suppress shallow abnormality, highlight deep regional anomaly; Downward continuation suppressing deep abnormal, highlight the shallow local anomalies.Based on potential field conversion and continuation of the conversion as the research object, introduces the four methods respectively(integral interpolation method and numerical integral method, the direct solution of Laplace's equation and the equivalent source method) the theoretical basis and method of technology, and by establishing the model of comprehensive comparison and analysis the advantages and disadvantages of various methods.This paper designed two sets of model, model for five large buried depth deeper cubes, four small and shallow cuboid and model 2. Five big two small seven spheres, this paper studies the four methods of the designed model respectively, the continuation and continuation calculation under processing. By analyzing the results, obtained in the upper and lower continuation, equivalent source the best effect, direct effect, Laplace's equation and numerical integral method of integral interpolation effect is the worst.In practical applications, based on the data in a given area as an example for processing location-field transformation, with integral interpolation method, the numerical integral method, the direct solution of Laplace equation, the equivalent source method on the continuation of the gravity measurement data processing, and then compare the continuation of the four methods and analysis, inference and interpretation in conformity with the geological data interpretation, draw the same conclusion with theoretical research and model test, received a good application effect.