| 节理扩展煤层应力场的联合反演分析 |
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| 引用本文： | 张立松,闫相祯,杨秀娟,杨恒林,王欣.节理扩展煤层应力场的联合反演分析[J].煤田地质与勘探,2011(6). |
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| 作者姓名： | 张立松 闫相祯 杨秀娟 杨恒林 王欣 |
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| 作者单位： | 中国石油大学储运与建筑工程学院;中国石油集团钻井工程技术研究院;中国石油集团科学技术研究院廊坊分院; |
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| 基金项目： | 国家科技重大专项项目(2011ZX05036;2011ZX05037); 中央高校基本科研业务费专项资金项目(11CX04050A) |
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| 摘 要： | 考虑地应力作用下节理扩展引起的煤岩物理力学性质改变,进而导致煤层应力、变形的重新分布,给出了煤岩单元节理扩展的计算方法,并分析了节理扩展与应力的相互作用关系。应用小波神经网络方法及逐级加载算法,提出节理扩展煤储层应力场的联合反演方法,并对沁水盆地晋城区块煤储层应力场分布规律进行分析。结果表明:晋城区块最大主应力为8~13 MPa,由西北向东南呈逐渐增大趋势;最小主应力为5~9 MPa,应力低值区集中在晋城南部区域。通过对比关键点的现场实测值与模拟计算结果,得知主应力大小与实测值最大误差仅为3%,方位误差小于1.3°,满足工程计算精度要求。利用联合反演分析煤储层应力场,具有计算精度高、速度快、建模简单等优点,适合于软件集成快速计算。
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| 关 键 词： | 节理扩展 煤层应力场 联合反演分析 小波神经网络 逐级加载算法 |
Combined inversion analysis of coal seam stress field considering joint propagation |
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| ZHANG Lisong,YAN Xiangzhen,YANG Xiujuan,YANG Henglin,WANG Xin.Combined inversion analysis of coal seam stress field considering joint propagation[J].Coal Geology & Exploration,2011(6). |
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| Authors: | ZHANG Lisong YAN Xiangzhen YANG Xiujuan YANG Henglin WANG Xin |
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| Institution: | ZHANG Lisong1,YAN Xiangzhen1,YANG Xiujuan1,YANG Henglin2,WANG Xin3(1.College of Pipeline and Civil Engineering,China University of Petroleum,Qingdao 266555,China,2.Institute of Drilling and Technology,China Petroleum Group,Beijing 100097,3.Langfang Branch,Research Institute of Petroleum Exploration and Development,Langfang 065007,China) |
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| Abstract: | Joint propagation changes the physical and mechanical properties of coal due to in-site stress,then the redistribution of coal seam stress and deformation is caused,so the calculation method of coal element joints propagation is given,and relationship between joint propagation and stress is analyzed.Application of wavelet neural network and gradual loading algorithm,a methodology of inversion analysis of coal seam stress field is presented,and the distribution regularity of in-site field is studied for Jinc... |
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| Keywords: | joint propagation coal seam stress field combined inversion analysis wavelet neural network gradual loading algorithm |
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