Volumetric edge detection of seismic data based on arbitrarily rotated windowed Hilbert transform
XU He1, CHEN Xuehua1,2, LYU Bingnan2, LI Kangyi2, XU Bin2
1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. Key Lab of Earth Exploration & Information Techniques of Ministry of Education, Chengdu University of Technology, Chengdu, Sichuan 610059, China
Abstract：The edge detection algorithm based on Hilbert transform usually extracts comprehensive fracture information from real seismic data. The information is very complicated and may weaken some effective information, making difficult to distinguish data characteristics in a particular direction, and unconducive to analyzing fracture orientation. This paper proposes a volumetric edge detection algorithm based on fracture directionality. It uses a Gaussian window to process the Hilbert operator, and then rotates the operator counterclockwise at any angle on a direction detecting template. An arbitrarily rotated windowed Hilbert transform (ARWHT) edge detection operator is constructed. It can extract effective edges in any specific direction. The algorithm is used for volumetric edge detection of 3D seismic data. It can not only extract discontinuous features in any direction of seismic data, but also highlight local abnormal information and reduce the influence of noises, so as to obtain a more accurate trend and distribution of reservoir fractures. Applications on model and raw data have proved that the algorithm has the following characteristics. For large faults with known strike or fracture systems with similar orientation, in order to strengthen the discontinuous information of the strike or orientation, the operator perpendicular to the strike or orientation should be selected. For complex fracture systems containing information in various directions, more angles should be selected to extract edge information for fusion, so as to display more effective information. This is conducive to fine seismic interpretation.
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