李勤^1,,
李永博²,
李庆春^3,,
1. 西安科技大学地质与环境学院, 西安 710054
2. 中国地质科学院物化探研究所, 河北廊坊 065000
3. 长安大学地质工程与测绘学院, 西安 710054

基金项目: 国家自然科学基金项目（41674135，41874123）、陕西省自然基金（2016JM4010）及中央高校基本科研业务费专项资金（300102268401）联合资助


详细信息

作者简介: 李勤, 女, 博士, 副教授, 2011年毕业于长安大学地球探测与信息技术专业, 现就职于西安科技大学地质与环境学院, 主要从事地震波各向异性方面的研究.E-mail:eriliqin@126.com

通讯作者: 李庆春, 男, 教授, 主要从事地震波数值模拟与成像方法研究.E-mail:dcliqc@chd.edu.cn

中图分类号: P631

收稿日期:2018-01-08
修回日期:2018-11-19
上线日期:2019-01-05

Seismic response of anisotropic coal beds with vertical cracks

LI Qin^1,,
LI YongBo²,
LI QingChun^3,,
1. School of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China
2. Institute of Geophysical and Geochemical Exploration, CAGS, Hebei Langfang 065000, China
3. School of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China


More Information

Corresponding author: LI QingChun,E-mail:dcliqc@chd.edu.cn

MSC: P631

--> Received Date: 08 January 2018
Revised Date: 19 November 2018
Available Online: 05 January 2019


摘要
摘要:煤层中存在的裂隙会导致介质表现为各向异性，本文以HTI型煤层为例，结合各向异性介质弹性矩阵和各向异性裂隙理论，推导出不同充填物的垂直裂隙中各向异性参数表达式，将其应用于地震波响应分析；通过改进的交错网格差分法和各向异性Christoffel方程波场分解法，得到地震波合成记录和分解后的P波和SV波记录；将Thomsen群速度与相速度公式，经过坐标轴旋转变换，得到HTI型煤层中不同各向异性参数的地震波速度响应表达式；建立不同类型煤层地质模型，分析了裂隙密度、裂隙充填物以及煤层厚度等参数变化时的地震波响应特征.研究结果为分析垂向裂隙各向异性薄煤层地震波传播规律提供工具，为选用相应地震数据进行地震波各向异性参数反演提供依据.
关键词: 裂隙/
HTI介质/
煤层/
各向异性/
地震响应

Abstract:There are many kinds of cracks in coals beds, which induce anisotropy in seismic waves. In this paper, combining elastic matrix and fracture theory in anisotropic media, the expressions of anisotropic parameters in a HTI coal bed are derived when it is filled by different materials such as gas and water, which are used to analyze characteristics of seismic response. Seismic synthetic records and decomposed P-wave and SV-wave records are simulated by the revised staggered grid difference method and wave field decomposition method for anisotropic Christoffel equation. Seismic velocity variation with angle is indicated by rotating the coordinate axis in the Thomsen's group and phase velocity equations. The geological models of different types of coal seams are established and the characteristics of seismic wave response with different parameters such as crack density, filling materials and thickness of coal seams are presented. The results provide tools for analyzing seismic wave propagation in anisotropic thin coal seams and a theoretical basis for choosing appropriate seismic data for inversion of anisotropic parameters.
Key words:Crack/
HTI medium/
Coal bed/
Anisotropy/
Seismic response



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