1. Geophysical Research Institute of SINOPEC Shengli Oilfield Company,Dongying 257022,China 2. International Department of Sinopec Geophysical Corporation,Beijing 100020,China
Conventional fault detection attributes can identify low-sequence faults with relatively flat stratigraphic attitudes and obvious seismic reflection characteristics.Low-order faults are poorly identified in places where strata are inclined or the dip angle of strata changes drastically.In view of the above difficulties,on the basis of an in-depth analysis of the geological characteristics and seismic response characteristics of low-order faults,the authors carried out the research based on a method for identifying low-order faults based on the structure-oriented Canny attribute edge detection according to the combination of 3D multi-level blind source separation and structural preservation filtering denoising,and formed an effective low-order fault identification method,which improved the capability of low-order fault identification.Compared with coherent attributes,the noise detection results of the structure-oriented Canny attribute edge detection are smaller,especially in places where the stratum is steep or the attitude of the formation fluctuates greatly (that is,the formation dip angle changes greatly).The results are better.The obtained results are in good agreement with real drilling results,and the oil-water relationship in the study area is solved.Five more low-order faults were discovered,and new drilling wells have achieved high oil production flow.
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