① 中国石油大学CNPC物探重点实验室,北京 102249;
② 长安大学西部地质资源与地质工程教育部重点实验室,陕西 西安 710054;
3 北京市昌平区中国石油大学CNPC物探重点实验室904室,102249
Suppression of multiples by improved expanding multi-channel match minus method
Liu Hua-feng1,2,3, Li Qing-chu2, Wang Li-ming2
1. CNPC Key Lab of Geophysical Prospecting, China University of Petroleum, Beijing City, 102249, China;
2. Key Lab of Education Ministry for Western Geology Resource and Engineering, Chang'an University, Xi'an City, Shanxi Province, 710054, China
Abstract：Using multiple prediction method for predicting multiple model records based on moveout equation and in combination with the advantages and disadvantages of four minus methods: single-channel match, conventional multi-channel match, pseudo-multi-channel match and expanding multi-channel match, the paper presented improved ideas, gave computational steps of improved multi-channel match minus method and improved expanding multi-channel match minus methods and tried to evaluate the role of iterative idea in match minus method. It got following main conclusions by theoretical model and practical test data: in a precondition of known a prior-information of water layer depth, using moveout equation method to predice multiple model records is characterized by fast computational speed and basically meeting the requirement of precision, which is an effective method predicting sea-bottom multiples; the improved expanding multi-channel match minus method is characterized by strong adaptive capacity and good hi-fi of signal, acquiring satisfactory effect in model test and practical data application, which can joint application with other predicting methods; the three main controlling factors: length and window size of filtering factor and number of adjacent match channels have influence on effect of match minus method, which should select appropriate match parameters according to the feature of data themselves when using match minus method. It discovered by correlation of iterative match minus results that iterative operation plays any role in improving the match precision.
刘华锋, 李庆春, 王立明. 利用改进的扩展多道匹配相减法压制多次波[J]. 石油地球物理勘探, 2009, 44(3): 270-275.
Liu Hua-feng, Li Qing-chu, Wang Li-ming. Suppression of multiples by improved expanding multi-channel match minus method. OGP, 2009, 44(3): 270-275.
