Dreamlet:A New Representation and Migration of Seismic Wavefield in Full Local Domains
作者机构：School of Mathematics and StatisticsXi’an Jiaotong UniversityXi’an 710049P.R.China Department of Earth and Planetary SciencesUniversity of California Santa CruzSanta Cruz 95064USA CNOOC Research Institute Co.Ltd.Beijing 100028P.R.China
出 版 物：《Communications in Computational Physics》 (计算物理通讯（英文）)
年 卷 期：2020年第28卷第6期
页 面：111-127页
核心收录：
学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学]
基 金：supported by the National Natural Science Foundation of China(41604106,41674123,11871392) the Fundamental Research Funds for the Center Universities(xjj2018260) the China Postdoctoral Foundation(2016M600780) WTOPI(Wavelet Transform On Propagation and Imaging for seismic exploration)Project at University of California,Santa Cruz
主 题：Seismic imaging wave equation local harmonic transform seismic migration dreamlet transform
摘 要：Seismic events have limited time duration,vary with space/traveltime and interact with the local subsurface medium during *** is a valu-able strategy for nonstationary seismic data analysis,processing and wave *** has the potential for sparse data representation,flexible data operation and highly accurate local wave *** local transforms are powerful tools for seismic data segmentation and *** this paper,a detailed description of a multi-dimensional local harmonic transformed domain wave propagation and imaging method is *** a tensor product of a Local Exponential Frame(LEF)vector as the time-frequency atom(a drumbeat)and a Local Cosine Basis(LCB)function as the space-wavenumber atom(a beamlet),we construct a time-frequency-space-wavenumber local atom-dreamlet,which is a combination of drumbeat and *** dreamlet atoms have limited spatial extension and temporal duration and constitute a complete set of frames,termed as dreamlet frames,to decompose and represent the *** dreamlet transform first partitions the wavefields using time-space supporting functions and then the data in each time-space blocks is repre-sented by local harmonic *** transformed wavefield is downward-continued by the dreamlet propagator,which is the dreamlet atom evolution weightings deduced from the phase-shift one-way *** dreamlet imaging method is formulated with a local background propagator for large-scale medium propagation and com-bined with a local phase-screen correction for small-scale *** features of dreamlet migration and imaging include sparse seismic data representation,accurate wave propagation and the flexibility of localized time operations during *** tests using Sigsbee 2A synthetic data set and real marine seismic data demonstrate the validity and accuracy of this *** time-domain localization being involved,the dreamlet method can also be
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