The Research Of Magnetic Anomaly Characteristics Under The Influence Of The Remanent Magnetization

With the rapid development of magnetic prospecting technology, now it has entered a new stage of high precision measurement, quantitative processing data and inversion, the strong remanent magnetization of magnetic rock(ore) bodies and its influence has reached the point where they cannot be ignored. In the work area of strong remanent magnetism field, magnetic survey data contains significant residual magnetism effect, not only affects the size of the total magnetization, but also affect its direction. If we don’t consider the effect of remanent magnetization, when we make magnetic survey work in the field that the remanent magnetization is stronger, it will larger influence on data processing and interpretation of results. In this background, this paper studies the influence of remanent magnetization about the magnetic survey data processing method, promising to guidance and reference the production practice.First, the mathematical model is set up to simulate the sphere abnormal curve, studied with the increase of remanent magnetization, the change of profile curve. Confirmed that along with the increase of the remanent magnetization the the distortion of the curve is more and more serious, it can affect late data processing.Secondly, through simulation experiment, compared with the consideration of residual magnetism and does not consider remanent magnetism in the forward differences plane contour map, especially for the effect after the pole are analyzed. Obtained that in strong remanence magnetization field, pole method must be use very carefully, providing a reference for the observed data of interpretation.In order to obtain the magnetic distribution characteristics of the study area, we make data processing of the area. Through the upward continuation and matched filtering method to obtain the distribution of local and regional field in the work area. In the processing of magnetic survey data, we found the disadvantage of the pole, the mineralization anomalies are reversal after the pole, lead to the opposite attitude to explain the results. As the continuation, matched filtering and other data processing methods, such as smooth. Because in the process of calculation does not involve the magnetizing Angle parameters, so compared with actual data processing results the error is smaller. Can be thought of as processing result is correct. Thus, we infer that in the case of strong remanence, the biggest impact is always the direction of the magnetic field strength, so some data processing method involved in the direction of the magnetic field will produce a large error in use process.According to the results of early treatment, we make the inversion process in the southwest high strength negative anomaly area in work area. Analysis of the reliability of inversion results and the causes of error. Obtain the burial depth of the underground geological parameters. For the subsequent prospecting work provides a certain reference value.