Application of seismic variance body attribute in improving section imaging of fault systems:a case study of the steep slope zone in the north of western sub-sag in Xijiang Sag
For complex fracture systems,the improvement of cross section imaging quality is the key to sol-ving geological problems such as the development of geologic abnormal body,low signal noise ratio(SNR),unclear fracture image and great difficulty on cross section intersection relationship identification.The steep slope zone in the north of western sub-sag in Xijiang sag has the dominant hydrocarbon migration mode of source-fault-ridge.The reservoir is dominated by complex faulted structures,and some areas are affected by volcanic rocks.In order to solve the problems of blurred fault system imaging,unclear fault intersection relationship,and strong multi-solution of seismic information,the technology of improving cross section imaging based on seismic variance body attribute is studied and applied.The basic idea is to utilize the ad-vantage of variance volume attribute analysis method for coherent tracking,and to perform coherent weigh-ting processing on the imaging volume based on the coherence of variance volume attributes,thereby impro-ving the imaging effect of cross-sections.The results show that the improvement of post-stack imaging da-ta quality not only maintains the continuity of layers but also maximizes the characteristics of break-point imaging,and improves the quality of seismic data.The imaging of cross-sections,basement morphology,and faults become clearer,and therefore,it has good application.
diffraction wave imagingfracture system imagingseismic variance attributesenhanced post-stack profile imaging
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