Adaptive directional enhancement detection and application of seismic discontinuity information
LI Kangyi1, CHEN Xuehua1,2, WU Haojie2, LYU Bingnan2, ZHAO Chenfei2
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. Key Laboratory of Earth Exploration and Information Techniques, Ministry of Education, Chengdu University of Technology, Chengdu, Sichuan 610059, China
Abstract：In actual seismic data， discontinuous information such as cracks and river channels often varies in diffe-rent directions and is also affected by various noises， which brings difficulties and challenges to the extraction of high-precision geological anomaly information. Therefore， based on previous methods， an adaptive direction enhancement method for seismic discontinuity information is proposed， and a Gaussian filter direction is selected according to the crack direction to perform secondary iterative filtering on seismic data. The specific steps are as follows. ①The input seismic data through a Gaussian window in all given directions within the range of 0°~180° is scanned， and the processing results in the direction of the maximum value of sum of amplitudes at each position are selected. ②A time window is chosen to scan and process data， and mapped to L-level grayscale to form seismic texture primitives. ③Texture parameters of the co-occurrence matrix for any specific direction of data within the time window are obtained， and the specific direction of processing data is determined. ④The determined crack direction is substituted into the anisotropic Gaussian filtering direction matrix for secondary iteration. ⑤The enhanced final image is obtained by employing the attribute analysis method of anisotropic volume curvature for processing data. The results show that the proposed method suppresses interference information in different directions from fractures， greatly highlights geological structural features， and better reflects the structural details and discontinuities in specific directions. Meanwhile， this method can select one or more specific directions on its own， displaying only the structural information of the selected direction. Finally， technical support is provided for structural interpretation， understan- ding of fault distribution patterns， and reservoir prediction.
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