Experimental study on seismic amplitude attribute of thin interbed based on 3D model
Li Guo-fa1,2, Yue Ying3, Xiong Jin-liang3, Zhai Tong-li3, Guo Chun-xiang1,2
1. State Key Lab of Earth Resource and Prospecting,China University of Petroleum,Beijing City,102249,China;
2. CNPC Key Lab of Geophysics,China University of Petroleum,Beijing City,102249,China;
3. Dagang Oilfield Branch Company of Petrochina,Tianjin City,300280,China
Abstract：In order to verify the relationship between the amplitude attribute and the cumulative thickness of a sand body,as well as the relationship between the variation of amplitude slice with depth and the sedimentary evolution of a sand body,three thin interbeded models were established in this paper and the experiment of seismic attribute analysis was carried out based on the models and the 3D synthetic data volume simulated by using the convolution method.The experiment results indicate that:(1) as for the thin interbed with single complex wave formed after wavelet interference,the amplitude slice can qualitatively reflect the changing of cumulative thickness of sand body and it shows a positive correlation between the reflection amplitude and the cumulative thickness,and the change of the amplitude slice in different depth can qualitatively reflect evolution process of the sedimentary sand body,(2) for the thin interbed with several complex waves formed after interference,the amplitude slice can qualitatively reflect the lateral distribution range of sand body.However,it does not always show the positive correlation between the reflection amplitude and sand body thickness,and the change of the amplitude slices in different depths can still reflect evolution process of the sedimentary sand body in a certain extent,but the correlation becomes weaker compared with the first situation,and(3) the correlation between reflection amplitude and the sedimentary sand body is not the time isochronic.
