Internal multiple attenuation using time-inverted primary
Ma Jitao1, Chen Xiaohong1, Yao Fengchang2, Zhang Zheng3
1. State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;
2. Geophysical Department,Research Institute of Petroleum Exploration & Development,CNPC,Beijing 100083,China;
3. Sino Geophysical Co.Ltd.,Beijing 100107,China
Abstract：The discrimination and attenuation of internal multiples is very important in seismic multiple attenuation.The normal moveout difference between internal multiple and primary is small,so conventional methods based on moveout difference are almost invalid in the internal multiple attenuation.We discuss here predicted internal multiple subtraction based on wave equation methods.After some data pre-processing,we chose a layer,and predict all internal multiples related to the layer.The prediction process is a consistent convolution along the layer.The subtraction method that we used is the traditional least-squares adaptive subtraction method.Synthetic data examples illustrate the feasibility of the method.
