基于广义S变换的时变分频技术

Timevariable frequency division based on generalized S transform

1.中国石油大学(华东)地球科学与技术学院，山东青岛266580;2.中国石油化工股份有限公司胜利油田分公司地质科学研究院,山东东营257015;3.中国石油化工股份有限公司胜利油田分公司博士后工作站,山东东营25701

Wang Changjiang, School of Geosciences,China University of Petroleum (East China),Qingdao 266580,China

分频技术已经广泛地应用于地震勘探数据处理和解释过程中。但是,目前的分频技术只能够实现待分析地震道整个时间段的、单一频率的分频处理,称之为时不变分频技术;而对于地震道任意时间点、不同频率的分频处理,需要应用时变分频技术来实现。首先通过广义S变换进行地震道的时频分析,得到时频数据；然后在时频域设计二维时变滤波器,对时频数据进行滤波；最后将滤波后的时频数据进行反变换,得到时变分频结果。模型试算与实际应用表明,时变分频技术能够更加灵活有效地实现地震数据的分频处理。

Frequency division technology has been widely used in seismic data processing and interpretation.However,the current frequency division technology can only be applied in the whole time range and single frequency division of seismic trace,which is named time invariant frequency division (TIFD).The frequency division at any time point and different frequency of seismic trace should be realized through the timevariable frequency division (TVFD).First of all,timefrequency data are acquired by timefrequency analysis of seismic trace through generalized S transformation.Then,2D timevariable filtering (TVF) is designed in timefrequency domain and the timefrequency data is filtered by using TVF.Finally,the inverse transformation is applied on the filtered timefrequency data and timevariable frequency division results are acquired.Model test and practical application show that TVFD can realize frequency division processing of seismic data more flexibly and effectively.

国家科技重大专项“渤海湾盆地精细勘探关键技术”(2011ZX05006)项目资助。

10.3969/j.issn.10001441.2013.05.007