True-amplitude, angle-domain, common-image gathers from one-way wave-equation migrations

doi:10.1190/1.2399371

CSpace

	True-amplitude, angle-domain, common-image gathers from one-way wave-equation migrations
	Zhang, Yu ; Xu, Sheng ; Bleistein, Norman ; Zhang, Guanquan
	2007
发表期刊	GEOPHYSICS
ISSN	0016-8033
卷号	72 期号:1 页码:S49-S58
摘要	True-amplitude wave-equation migration provides a quality migrated image of the earth's interior. In addition, the amplitude of the output provides an estimate of the angular-dependent reflection coefficient, similar to the output of Kirchhoff inversion. Recently, true-amplitude wave-equation migration for common-shot data has been proposed to generate amplitude-reliable, shot-domain, common-image gathers in heterogeneous media. We present a method to directly produce angle-domain common-image gathers from both common-shot and shot-receiver wave-equation migration. Generating true-amplitude, shot-domain, common-image gathers requires a deconvolution-type imaging condition using the ratio of the upgoing and downgoing wave-field, each downward-projected to the image point. Producing true-amplitude, angle-domain, common-image gathers requires, instead, the product of the upgoing wavefield and the complex conjugate of the downgoing wavefield in the imaging condition. Since multiplication is a more stable computational process than division, the new methods proposed provide more stable ways of inverting seismic data. Furthermore, the resulting common-image gathers can be directly used for migrated amplitude-variation-with angle analysis and tomography-based velocity analysis. Shot-receiver wave-equation migration requires new true-amplitude, one-way wave equations with one depth variable and transverse variables for the coordinates corresponding to sources and receivers, hence, two transverse coordinates in 2D and four transverse coordinates in 3D. We propose a modified double-square-root one-way wave equation to produce true amplitude common-image angle gathers. We also demonstrate the new methods with some synthetic examples. Some numerical examples show that the new methods we propose give better amplitude performance on the migrated angle gathers.
DOI	10.1190/1.2399371
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000243728500030
出版者	SOC EXPLORATION GEOPHYSICISTS
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/5040
专题	中国科学院数学与系统科学研究院
通讯作者	Zhang, Yu
作者单位	1.Veritas DGC Inc, Houston, TX 77072 USA 2.Colorado Sch Mines, Ctr Wave Phenomena, Dept Geophys, Golden, CO 80401 USA 3.Chinese Acad Sci, Acad Math & Syst Sci, Inst Computat Math & Sci Engn Comp, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yu,Xu, Sheng,Bleistein, Norman,et al. True-amplitude, angle-domain, common-image gathers from one-way wave-equation migrations[J]. GEOPHYSICS,2007,72(1):S49-S58.
APA	Zhang, Yu,Xu, Sheng,Bleistein, Norman,&Zhang, Guanquan.(2007).True-amplitude, angle-domain, common-image gathers from one-way wave-equation migrations.GEOPHYSICS,72(1),S49-S58.
MLA	Zhang, Yu,et al."True-amplitude, angle-domain, common-image gathers from one-way wave-equation migrations".GEOPHYSICS 72.1(2007):S49-S58.