Revealing small-scale diffracting discontinuities by an optimization inversion algorithm

doi:10.1088/1742-2132/14/1/1

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院油气资源研究重点实验室

	Revealing small-scale diffracting discontinuities by an optimization inversion algorithm
	Yu, Caixia 1; Zhao, Jingtao 2; Wang, Yanfei 1
刊名	JOURNAL OF GEOPHYSICS AND ENGINEERING
	2017-02-01
卷号	14 期号:1 页码:1-14
关键词	plane-wave prediction optimization inversion algorithm diffraction separation diffraction extraction
DOI	10.1088/1742-2132/14/1/1
文献子类	Article
英文摘要	Small-scale diffracting geologic discontinuities play a significant role in studying carbonate reservoirs. The seismic responses of them are coded in diffracted/ scattered waves. However, compared with reflections, the energy of these valuable diffractions is generally one or even two orders of magnitude weaker. This means that the information of diffractions is strongly masked by reflections in the seismic images. Detecting the small-scale cavities and tiny faults from the deep carbonate reservoirs, mainly over 6 km, poses an even bigger challenge to seismic diffractions, as the signals of seismic surveyed data are weak and have a low signalto-noise ratio (SNR). After analyzing the mechanism of the Kirchhoff migration method, the residual of prestack diffractions located in the neighborhood of the first Fresnel aperture is found to remain in the image space. Therefore, a strategy for extracting diffractions in the image space is proposed and a regularized L-2-norm model with a smooth constraint to the local slopes is suggested for predicting reflections. According to the focusing conditions of residual diffractions in the image space, two approaches are provided for extracting diffractions. Diffraction extraction can be directly accomplished by subtracting the predicted reflections from seismic imaging data if the residual diffractions are focused. Otherwise, a diffraction velocity analysis will be performed for refocusing residual diffractions. Two synthetic examples and one field application demonstrate the feasibility and efficiency of the two proposed methods in detecting the small-scale geologic scatterers, tiny faults and cavities.
WOS关键词	PRESTACK TIME MIGRATION ; ANGLE GATHERS ; SEPARATION ; MOVEOUT ; DOMAIN ; DEPTH
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000390362800001
资助机构	National Natural Science Foundation of China(41325016 ; National Natural Science Foundation of China(41325016 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10020101) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10020101) ; 41604125) ; 41604125) ; National Natural Science Foundation of China(41325016 ; National Natural Science Foundation of China(41325016 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10020101) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10020101) ; 41604125) ; 41604125)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53171]
专题	地质与地球物理研究所_中国科学院油气资源研究重点实验室
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China 2.China Univ Min & Technol Beijing, State Key Lab Coal Resources & Safe Min, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Yu, Caixia,Zhao, Jingtao,Wang, Yanfei. Revealing small-scale diffracting discontinuities by an optimization inversion algorithm[J]. JOURNAL OF GEOPHYSICS AND ENGINEERING,2017,14(1):1-14.
APA	Yu, Caixia,Zhao, Jingtao,&Wang, Yanfei.(2017).Revealing small-scale diffracting discontinuities by an optimization inversion algorithm.JOURNAL OF GEOPHYSICS AND ENGINEERING,14(1),1-14.
MLA	Yu, Caixia,et al."Revealing small-scale diffracting discontinuities by an optimization inversion algorithm".JOURNAL OF GEOPHYSICS AND ENGINEERING 14.1(2017):1-14.