The Application Of Gravity And CSAMT Method In Geology Survey In Dapingshan Area

The Dapingshan area is one of China's important iron-copper ore deposits.The predecessors conducted a large number of mineral surveys and geological studies in the area.In the area,the predecessors have not only discovered the mineral reserves in the area,but also accumulated a wealth of geological data.In order to identify the extension and distribution of fault structures in the Dapingshan area,and further increase production efficiency,it is necessary to comprehensively use various geophysical methods to provide more geophysical information.Gravity exploration has been developed earlier and is widely used.It also has more mature potential field data processing method,which can achieve good results in the transverse interpretation of regional geological information.The CSAMT method has a higher utilization rate in China's oil and gas exploration.This method has comparatively systematic data processing technology and can analyze profile data from qualitative to quantitative.The comprehensive use of the gravity exploration method and the CSAMT method is reasonable and reliable in solving the geological interpretation problems in the Dapingshan area.This paper summarizes the geophysical and geophysical profiles of the Dapingshan area and understands the differences in the density and electrical properties of the rock ore in the area.This paper studies the theoretical basis and technical means of CSAMT method and systematically analyzes the data processing process of this method.A theoretical explanation of the data processing method of gravity field is performed,and through the model test,the effectiveness of the de-noising method of the sliding average method is judged.The application of the trend surface analysis method and wavelet multi-scale analysis in the separation of the potential field is compared and verified,and the reliability of multiple boundary identification methods is verified.Gravity data can also obtain longitudinal geological information through profile data to some extent.This paper selects gravity normalized total gradient method for theoretical explanation and model test.The gravitational data of the Dapingshan area were processed,and the local gravity information in the area was obtained through the moving average denoising and wavelet multiscale analysis.Boundary identification of local field anomalies was conducted to transverse analyze the distribution of fault structures in the area.The profile information of the gravity local field anomaly was extracted and combined with the CSAMT method to analyze the distribution and extension of the longitudinal fault structure in the area.Finally,transverse and longitudinal analysis results were comprehensively considered and combined weiwith the geological information of the area to infer the distribution of fracture structures in the study area.