The New Approach on Accurate Description of Central Volcanic Conduits: Applications to Southern Part of Bohai Bay Basin

In igneous rock area, the volcanic conduits could influence the reserves calculation and well location decision. So, accurate description of volcanic conduits has attracted common attention. In this paper, the new method is put forward to make accurate description of volcanic conduits, which is integrated with diffusion filter, improved seismic coherency attribute and edge detection attribute. Considering the damagement of volcanic conduit edge information with conventional denoising methods, diffusion filter is introduced, which could effectively suppress random noise and maintain the edge information of volcanic conduit. Based on multiscale characteristic of wavelet transform, the appropriate frequency segment of data is selected to reconstruct seismic data. The improved coherency data is computed with the dip and azimuth information on the basics of reconstructed data and the accuracy is better than conventional coherency attribute. In order to enhance edge accuracy of volcanic conduits, we introduce edge detection attribute based on computer graphics. Take Sobel operator as example, it has certain ability to suppress noise information, which can increase the resolution of current coherency attributes. At last, we complete spatial description of volcanic conduits by making 3D geologic abnormality curving based on improved attribute in practical application.