Noise has traditionally been suppressed or eliminated in seismic data sets by the use of Fourier filters and, to a lesser degree, nonlinear statistical filters. Although these methods are quite useful under specific c...Noise has traditionally been suppressed or eliminated in seismic data sets by the use of Fourier filters and, to a lesser degree, nonlinear statistical filters. Although these methods are quite useful under specific conditions, they may produce undesirable effects for the low signal to noise ratio data. In this paper, a new method, multi-scale ridgelet transform, is used in the light of the theory of ridgelet transform. We employ wavelet transform to do sub-band decomposition for the signals and then use non-linear thresholding in ridgelet domain for every block. In other words, it is based on the idea of partition, at sufficiently fine scale, a curving singularity looks straight, and so ridgelet transform can work well in such cases. Applications on both synthetic data and actual seismic data from Sichuan basin, South China, show that the new method eliminates the noise portion of the signal more efficiently and retains a greater amount of geologic data than other methods, the quality and consecutiveness of seismic event are improved obviously as well as the quality of section is improved.展开更多
The continental dynamic research has focused on the theory and model of collisional orogenic belts. As the joining zone between the southern and northern China massives, Dabie orogen has attracted many geologists from...The continental dynamic research has focused on the theory and model of collisional orogenic belts. As the joining zone between the southern and northern China massives, Dabie orogen has attracted many geologists from China and abroad, for its various distinctions, especially the exposed root profile, which rarely occurs in the world, of the orogenic belt. At present, however, the collision process, structure and deep geology of the orogen are not well known. The magnetotelluric prospecting profile from Lu’an,展开更多
Bouguer anomaly can be considered as the total sum of the attraction effects resulting from the geological bodies beneath the observational point with different scales, densities and depths. How can we extract tlae in...Bouguer anomaly can be considered as the total sum of the attraction effects resulting from the geological bodies beneath the observational point with different scales, densities and depths. How can we extract tlae information of deep crust from Bouguer anomaly?The authors suggested using the formula of 3D positive calculation to determine the surface gravity anomaly caused by the shallow strata. After layering forward calculation, the deep residual gravity anomaly reflecting crustal structure is obtained. If we take Moho depth of 3 l km from DSS in Fujian Province as a controlling point, the crustal thickness throughout the whole region is inversed. As for the calculation and error, see Refs.展开更多
基金supported by China Petrochemical key project during the 11th Five-year Plan as well as the Doctorate Fund of Ministry of Education of China (No.20050491504)
文摘Noise has traditionally been suppressed or eliminated in seismic data sets by the use of Fourier filters and, to a lesser degree, nonlinear statistical filters. Although these methods are quite useful under specific conditions, they may produce undesirable effects for the low signal to noise ratio data. In this paper, a new method, multi-scale ridgelet transform, is used in the light of the theory of ridgelet transform. We employ wavelet transform to do sub-band decomposition for the signals and then use non-linear thresholding in ridgelet domain for every block. In other words, it is based on the idea of partition, at sufficiently fine scale, a curving singularity looks straight, and so ridgelet transform can work well in such cases. Applications on both synthetic data and actual seismic data from Sichuan basin, South China, show that the new method eliminates the noise portion of the signal more efficiently and retains a greater amount of geologic data than other methods, the quality and consecutiveness of seismic event are improved obviously as well as the quality of section is improved.
文摘The continental dynamic research has focused on the theory and model of collisional orogenic belts. As the joining zone between the southern and northern China massives, Dabie orogen has attracted many geologists from China and abroad, for its various distinctions, especially the exposed root profile, which rarely occurs in the world, of the orogenic belt. At present, however, the collision process, structure and deep geology of the orogen are not well known. The magnetotelluric prospecting profile from Lu’an,
基金Project supported by the Joint Earthquake Science Foundation.
文摘Bouguer anomaly can be considered as the total sum of the attraction effects resulting from the geological bodies beneath the observational point with different scales, densities and depths. How can we extract tlae information of deep crust from Bouguer anomaly?The authors suggested using the formula of 3D positive calculation to determine the surface gravity anomaly caused by the shallow strata. After layering forward calculation, the deep residual gravity anomaly reflecting crustal structure is obtained. If we take Moho depth of 3 l km from DSS in Fujian Province as a controlling point, the crustal thickness throughout the whole region is inversed. As for the calculation and error, see Refs.
