Wu Jian1, Wang Runqiu1, Wei Jiaming2, Zhang Xiaolei3, Yu Junqing1, Sun Lipeng1, Jiang Yong-yong1
1. State Key Laboratory of Petroleum Resource and Prospecting, CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum (Beijing), Beijing 102249, China;
2. Land Ocean Energy Services Co. Ltd, Beijing 100094, China;
3. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Abstract:We analyze in this paper the causes of harmonics generated in vibroseis slip-sweep, and point out that the high order harmonics are the most serious noise. We discuss the slip-sweep through the theory analysis and numerical experiments. Based on the linearity between the energy of high order harmonics and reference signals in every frequency brand, we build a mathematical model for harmonic filtering. We utilize reference signal multiplication to generate every order harmonics, and estimate the energy ratio between every order harmonics. Application results on seismic data show that this harmonic filtering method can not only effectively remove harmonics, but also achieve fast calculations.