Coal Geology & Exploration


The storage and transport of gas and water in coal seam are related to the density, strike and filler of cracks. Research on the identification and prediction of coal seam cracks will be helpful to prevent and control disastrous accidents in coal mines, such as water inrush and gas outburst. It plays an important role in the safety evaluation of coal mining. Based on the theory of fracture equivalent model, the variation characteristics of fluid factor in coal seam crevices with different fillings and fracture weaknesses parameters(fracture density, aspect ratio, volume modulus, shear modulus, Lamé parameters) are analyzed by combining Schoenberg linear sliding model with dry, gas-bearing and saturated cracks in coal seam. Through calculating seismic wave group and phase velocity of coal bed with vertical cracks, the response characteristics of seismic wave anisotropic velocity are obtained when the density and filler of cracks in HTI coal bed change. From the forward simulation results of the HTI coal bed theoretical model, it can be seen that the fracture fluid factor in the model has a positive correlation with the fracture density and geometric shape, but a negative correlation with the volume modulus of filling fluid. HTI coal bed P wave group and phase velocity are sensitive to gas and water in the fracture, SV wave group and phase velocity are not sensitive to dry fracture(gas filling), and SV wave group velocity is very sensitive to water in fracture. The feasibility of coal seam fracture fluid prediction is realized through the response analysis of crack fluid factor and anisotropic velocity parameters in HTI coal bed. It lays a foundation for analyzing seismic wave propagation characteristics of coal seam with cracks and provides theoretical support for crack prediction of coal seam.


fracture, Schoenberg linear sliding model, fracture weaknesses, fluid factor, anisotropic




[1] HUDSON J A. Overall properties of a cracked solid[J]. Mathematical Proceedings of the Cambridge Philosophical Society,1980,88(2):371-384.

[2] HUDSON J A. Wave speeds and attenuation of elastic waves in material containing cracks[J]. Geophysical Journal International,1981,64(1):133-150.

[3] HUDSON J A. A higher order approximation to the wave propagation constants for a cracked solid[J]. Geophysical Journal International,1986,87(1):265-274.

[4] SCHOENBERG M. Elastic wave behavior across linear slip interfaces[J]. The Journal of the Acoustical Society of Amer-ica, 1980,68(5):1516-1521.

[5] SCHOENBERG M,DOUMA J. Elastic wave propagation in media with parallel fractures and aligned cracksl[J]. Geophysical Prospecting,1988,36(6):571-590.

[6] SCHOENBERG M,SAYERS C M. Seismic anisotropy of fractured rock[J]. Geophysics,1995,60(1):204-211.

[7] THOMSEN L. Elastic anisotropy due to aligned cracks in porous rock[J]. Geophysical Prospecting,1995,43(6):805-829.

[8] HUDSON J A,LIU E. Effective elastic properties of heavily faulted structures[J]. Geophysics 1999,64(2):479-485.

[9] BAKULIN A,GRECHKA V,TSVANKIN I. Estimation of fracture parameters from reflection seismic data-Part I:HTI model due to a single fracture set[J]. Geophysics,2000,65(6):1788-1802.

[10] 刘恩儒,曾新吾. 裂隙介质的有效弹性常数[J]. 石油地球物理勘探,2001,36(1):37-44. LIU Enru,ZENG Xinwu. The effective elastic constant of the fracture media[J]. Geophysical Prospecting for Petroleum,2001,36(1):37-44.

[11] CRAMPIN S. An introduction to wave propagation in aniso-tropic media[J]. Geophysical Journal International,1984,76(1):17-28.

[12] 张中杰,何樵登. 含裂隙介质中地震波运动学问题的正演模拟[J]. 石油地球物理勘探,1989,24(3):290-300. ZHANG Zhongjie,HE Qiaodeng. Forward modeling of seismic wave kinematics in fractured media[J]. Geophysical Prospecting for Petroleum,1989,24(3):290-300.

[13] 魏修成. 双相各向异性介质中的地震波场研究[D]. 北京:中国石油大学(北京),1995.

[14] 桂志先,贺振华,张小庆. 基于Hudson理论的裂隙参数对纵波的影响[J]. 江汉石油学院学报,2004,26(1):45-47. GUI Zhixian,HE Zhenhua,ZHANG Xiaoqing. Influence of crack parameters on longitudinal waves based on Hudson theory[J]. Journal of Jianghan Petroleum Institute,2004,26(1):45-47.

[15] 桂志先,贺振华,黄德济. 裂隙介质弹性性质研究[J]. 矿物岩石,2001,21(3):208-210. GUI Zhixian,HE Zhenhua,HUANG Deji. Study on elastic properties of fracture media[J]. Mineral Rock,2001,21(3):208-210.

[16] 詹林森. 裂隙参数的各向异性特征分析[C]//中国地球物理学会. 中国地球物理学会第二十七届年会论文集. 长沙:中国科学技术大学出版社,2011:508-509

[17] 彭苏萍,王宏伟,杜文凤,等. HTI煤层AVO响应特征及其影响因素[J]. 煤炭学报,2013,38(10):1715-1719. PENG Suping,WANG Hongwei,DU Wenfeng,et al. AVO response characteristics of HTI coal seam and its influencing factors[J]. Journal of China Coal Society,2013,38(10):1715-1719.

[18] 陈怀震,印兴耀,高成国,等. 基于各向异性岩石物理的缝隙流体因子AVAZ反演[J]. 地球物理学报,2014,57(3):968-978. CHEN Huaizhen,YIN Xingyao,GAO Chengguo,et al. AVAZ inversion for fluid factor based on fracture anisotropic rock physics theory[J]. Chinese Journal of Geophysics,2014,57(3):968-978.

[19] SCHOENBERG M. Elastic wave behavior across linear slip interfaces[J]. The Journal of the Acoustical Society of Amer-ica,1980,68(5):1516-1521.

[20] HSU C J,SCHOENBERG M. Elastic waves through a simulated fractured medium[J]. Geophysics,1993,58(7):964-977.

[21] THOMSEN L. Converted-wave reflection seismology over inhomogeneous,anisotropic media[J]. Geophysics,1999, 64(3):678-690.

[22] SENA A G,TOKSÖZ M N. Kirchhoff migration and velocity analysis for converted and nonconverted waves in anisotropic media[J]. Geophysics,1993,58(2):265-276.

[23] THOMSEN L. Weak elastic anisotropy[J]. Geophysics,1986,51(10):1954-1966.

[24] RÜGER A. P-wave reflection coefficients for transversely isotropic models with vertical and horizontal axis of sym-metry[J]. Geophysics,1997,62(3):713-722.

[25] 杜丽英,刘国明,杜丽娟,等. VTI介质中地震波反射波合成记录的方法研究[J]. 地球物理学进展,2001,16(2):58-64. DU Liying,LIU Guoming,DU Lijuan,et al. The method of seismic and reflection wave synthetic seismogram in VTI media[J]. Progress in Geophysics,2001,16(2):58-64.



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