| 各向异性煤层裂隙流体因子及地震波速度响应 |
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| 引用本文： | 李勤,马随波,赵斌.各向异性煤层裂隙流体因子及地震波速度响应[J].煤田地质与勘探,2019,47(6):167-173. |
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| 作者姓名： | 李勤 马随波 赵斌 |
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| 基金项目： | 国家自然科学基金项目（41674135，41304105） |
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| 摘 要： | 煤层中瓦斯和水的赋存及运移与裂隙的密度、走向、填充物类型等因素密切相关，为了预防和控制矿井突水、瓦斯突出等灾害性事故，进行煤层裂隙的识别和预测研究，对煤矿开采的安全性评价有重要指示作用。基于裂隙等效模型理论，将Schoenberg线性滑动模型与煤层干裂隙（气充填）和饱水裂隙相结合，分析煤层缝隙中流体因子随不同充填物与裂隙弱度参数（裂隙密度、纵横比、体积模量、剪切模量、拉梅系数）的变化特征，并通过对含垂向裂隙的煤储层进行地震波各向异性速度的响应计算。从HTI型煤层理论模型的正演模拟结果可知，模型中裂隙流体因子与裂隙密度和几何形态呈正相关函数关系，而与充填流体体积模量呈负相关。HTI型煤层P波群、相速度对裂隙中的气、水都比较灵敏，SV波群、相速度对干裂隙（气充填）不敏感，SV波群速度对裂隙中的水很灵敏。通过HTI型煤层裂隙流体因子与各向异性速度等参数的响应分析实现煤层裂隙流体预测的可行性，为分析裂隙型煤层地震波传播特征打下基础，为煤层裂隙流体预测提供理论支持。
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| 关 键 词： | 裂隙 Schoenberg线性滑动模型 裂隙弱度 流体因子 各向异性 |
| 收稿时间： | 2019-03-12 |
Fluid factor of fracture and seismic velocity response in anisotropic coal beds |
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| Abstract: | 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. |
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