Calculation method for theoretical dispersion curves of seismic channel waves considering variation of coal-seam thickness and analysis of dispersion characteristics

doi:10.6038/cjg2018K0684

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 > 岩石圈演化国家重点实验室

	Calculation method for theoretical dispersion curves of seismic channel waves considering variation of coal-seam thickness and analysis of dispersion characteristics
	Qiao YongHu 1,2; Teng JiWen 2,3
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2018-08-01
卷号	61 期号:8 页码:3374-3384
关键词	Seismic channel wave Coal-seam thickness variation Ray path Theoretical dispersion curve Dispersion characteristics
ISSN号	0001-5733
DOI	10.6038/cjg2018K0684
英文摘要	In channel-wave seismic exploration, dispersion features are used to invert structures of coal seams. So calculation of theoretical dispersion curves is an important subject. We can calculate dispersion curves when the coal-thickness keeps unchanged by utilizing the calculation method for surface wave dispersion of a horizontal stratified model. But this method is inapplicable when the coal-seam thickness changes. For a coal-bearing three-layer model, this work proposes a calculation method for theoretical dispersion curves when the coal-seam thickness fluctuates, which is based on the calculation method for dispersion curves of horizontal stratified models. We also analyze the characteristics of dispersion curves for different models of varied coal-seam thickness. Our research shows that unlike unchangeable coal-thickness model, group velocity of a changeable coal-thickness model becomes a function related to frequency and projective ray paths in horizontal plane. The change of coal-seam thickness along the ray route leads to squeezing effect of dispersion curves in velocity's direction, narrowing the range of group velocity and increasing the minimal group velocity at airy phase. The dispersion curve of the linearly changing coal-seam thickness model relates only to the thickness at the start and end of ray paths, while the curve shape does not change compared with the unchangeable coal-seam thickness model. The dispersion curve shape of a nonlinearly varied coal-seam thickness model may case change in the shape of dispersion curves with respect to the model with constant coal-seam thickness.
WOS关键词	HALF-SPACE ; LAYERED MEDIA ; COMPUTATION ; SH
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000442058500023
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/89171]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Qiao YongHu
作者单位	1.Shanxi Normal Univ, Linfen 041000, Shanxi, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Jilin Univ, Changchun 130026, Jilin, Peoples R China
推荐引用方式 GB/T 7714	Qiao YongHu,Teng JiWen. Calculation method for theoretical dispersion curves of seismic channel waves considering variation of coal-seam thickness and analysis of dispersion characteristics[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(8):3374-3384.
APA	Qiao YongHu,&Teng JiWen.(2018).Calculation method for theoretical dispersion curves of seismic channel waves considering variation of coal-seam thickness and analysis of dispersion characteristics.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(8),3374-3384.
MLA	Qiao YongHu,et al."Calculation method for theoretical dispersion curves of seismic channel waves considering variation of coal-seam thickness and analysis of dispersion characteristics".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.8(2018):3374-3384.