Li Jun1, Zhang Junhua1, Gong Mingping1, Yang Yong2, Du Yushan2, Wu Gang2
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Exploration & Production Research Institute, Shengli Oilfield Branch Co., SINOPEC, Dongying, Shandong 257015, China
Abstract：Edge detection methods are efficient and important for fault detection in seismic exploration.However most edge detection algorithms do not consider seismic dip and orientation information,and they cannot well detect some geological bodies such as faults and fractures.Therefore we propose in this paper a fault detection method based on magic matrix.The specific steps are as follows:1Select a magic cube,subtract the center value of all the elements of the matrix to obtain a new matrix,assign non-zero elements in the new matrix to 0 apart from the maximum and minimum absolute value of the elements,and obtain fault detection operator template; 2Follow the clockwise direction to rotate the fault detection operator template at 45° intervals to obtain the detection operator in other directions; 3Select a data sub-cube centered on a point of seismic data,The convolution operation is respectively to the data sub-cube and each direction of the cube operator to obtain data sub-cubes of different directions; 4The maximum absolute value of the obtained each direction convolution data is used as the each direction edge detection result.The maximum value of the fault detection results in different directions is selected as the edge detection result of the calculated point,and the corresponding direction is the tendency of this point.Model test and real data application show that the proposed method can effectively detect faults and give the corresponding dip information.
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