3-D tomographic static correction

doi:10.1190/1.1500390

	3-D tomographic static correction
	Chang, X ; Liu, YK ; Wang, H ; Li, FZ ; Chen, J
刊名	GEOPHYSICS
	2002-07-01
卷号	67 期号:4 页码:1275-1285
ISSN号	0016-8033
DOI	10.1190/1.1500390
文献子类	Article
英文摘要	A 3-D tomographic inversion approach based on a surface-consistent model for static corrections is presented in this paper. Direct, reflected, and refracted waves are used simultaneously to update the near-surface model. We analyze the characteristics of the first-break traveltime in complicated low-velocity layers. To improve the accuracy for the velocity model, the various first-break times from direct, reflected, and refracted waves are considered for model inversion. A fractal algorithm which overcomes the error caused by wavelet shape differences is applied to pick first breaks. It also overcomes the leg jump of refractions. The method can pick a large number of first breaks automatically. The raypaths and traveltimes are calculated with a 3-D ray tracer that does not increase computation time for complicated geological models. Our method can determine the raypath associated with minimum traveltimes regardless of wave mode (direct, refracted, or reflected). We use a least-squares approach in conjunction with a matrix decomposition to reconstruct a 3-D velocity model from the actual first-break times obtained from 3-D data. Finally, long- and short-wavelength static corrections are calculated concurrently, based on the reconstructed velocity profile. The method can be applied to wide-line profiles, crooked lines, and 2-D and 3-D seismic survey geometries. The results applied to a real 3-D data example indicate that the 3-D tomographic static corrections are effective for field data.
WOS关键词	FRACTAL DIMENSION ; ALGORITHM ; VELOCITY ; DEPTH
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SOC EXPLORATION GEOPHYSICISTS
WOS记录号	WOS:000177480500029
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/77627]
专题	中国科学院地质与地球物理研究所
通讯作者	Chang, X
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China 2.Chinese Natl Petroleum Co, Bur Geophys Prospecting, Hebei 072751, Peoples R China 3.Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA
推荐引用方式 GB/T 7714	Chang, X,Liu, YK,Wang, H,et al. 3-D tomographic static correction[J]. GEOPHYSICS,2002,67(4):1275-1285.
APA	Chang, X,Liu, YK,Wang, H,Li, FZ,&Chen, J.(2002).3-D tomographic static correction.GEOPHYSICS,67(4),1275-1285.
MLA	Chang, X,et al."3-D tomographic static correction".GEOPHYSICS 67.4(2002):1275-1285.