The Research On Boundary Recognition Method Based On Spectral Moment Analysis

Boundary identification is of great significance for geological structures and interpretation of anomalies.It can help us point out the boundary locations of underground faults,rock masses and other structural units.Because the density of mineral resources and geological structures are often significantly different from the surrounding rock masses.As a result,gravity exploration has a wide range of applications in the search of mineral resources and the exploration of geological structure boundaries.After decades of development,gravity exploration has become a very important geophysical exploration method.However,due to the complexity of the natural geological environment,the data which we collected in the field is also affected by various factors.Therefore,how to determine different geological anomalies,the boundaries,the locations and scales of geological structures more accurately are the issues that we always need to optimize and improve in geophysical work.In this paper,we introduced the more mature surface topography identification method in engineering into the bit field boundary recognition.At the same time,we characterized different anomalous parameters in gravity anomalies by using spectral moments of different orders on the surface of the potential field and their statistical invariants.We simulate the expression of different geological anomalies on the surface of the potential field through model tests and compare the recognition results of common boundary recognition methods with the recognition results of the surface field surface moment analysis method.This dissertation introduces the principle and advantages of the surface spectral moment analysis method and provide theoretical basis for subsequent actual data processing and analysis.In this paper we made field separation and boundary identification for 1:50000 gravity measurement data in Fengzhen-Guantunpu area.And extracted residual gravity anomalies at different depths in the survey area.Combining the geological comprehensive data of Fengzhen area with a variety of common boundary identification methods to identify and identify the gravity anomaly boundary,I've done the preliminary inference and delineation of the fault and structural boundary of the survey area.A total of 31 faults and 2 rock mass boundaries are sketched,combined with the local geological information,I detailed geological interpretation of 10 of the 31 faults.