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1)  double fracture systems
双重裂隙系统
1.
According to the principle of seepage flow in double fracture systems based on the analysis of natural regulation of fracture systems in rock masses, a practical seepage flow model which can effectively describe the seepage flow features in both dominant and subordinant fracture systems is developed from theoretical model of three dimensional seepage flow in fracture networks.
根据岩体裂隙系统发育规律及其渗流特征,提出双重裂隙系统渗流原理,将裂隙网络渗流理论模型变成能详细描述主次裂隙系统渗流机制的裂隙岩体渗流实用模型,为解决工程中的岩体裂隙渗流分析提供了新方法。
2)  fracture system
裂隙系统
1.
The purpose of this research is to investigate the properties of pore-fracture system and to reveal the relationship between the physical properties of coal reservoirs and recovery of coalbed methane in Huainan and Huaibei coal-fields.
借助于光学显微镜显微裂隙分析、压汞孔隙分析及低温氮吸附试验等手段,研究了两淮煤田煤储层孔、裂隙系统发育情况。
2.
There exist lots of factors influencing the differencial distribution of permeability,from such aspects as the development of fracture system,the effective stress of coal-bed reservoirs,coal-bed tectonic evolution and coal-bearing rock metamorphic degree,the relationship among them and spacial distribution of highly permeable areas and the research progress are illustrated.
煤储层渗透性是制约煤层气勘探选区的重要参数,影响渗透率差异分布的因素有很多,从裂隙系统的发育、煤储层有效应力、煤层构造演化、煤岩变质程度几个方面阐述了它们与高渗区空间分布的关系及其研究进展。
3)  fissure system
裂隙系统
1.
In this paper, the advances in overseas research on the origin and reservoir characteristics of coalbed gas (CBG) are selectively summarized in the light of three aspects: the CBG-generating mechanism and its geological controls; the porous structure and adsorption/desorption of coal; fissure systems and their effect on the permeability of coal reservoirs.
从煤层气生成机制及其地质控制、煤储层孔隙结构与吸附/解吸行为、煤储层裂隙系统及其对渗透率的影响三个方面,有重点地总结了国外有关煤层气成因和煤储层物性研究的新进展。
2.
With the analysis on the pressurized mercury experiments, a research was done on the development conditions of the porosity and fissure systems in the seams of the coalfield in Qinan Mining Area.
借助压汞试验分析,研究了祁南矿区煤田煤储层孔、裂隙系统发育情况,发现该区煤储层孔、裂隙系统具有:①微裂隙非常发育,多以宽度小于5μm,且长度小于300μm的裂隙为主体;②孔隙度较小,且孔隙类型中吸附孔(0~100nm)远比渗流孔(大于100nm)发育;③吸附孔多为连通性较差的一端封闭的平行板毛细孔。
3.
The coupling analysis between permeability and stress included permeability-stress coupling of porous media and permeability-stress coupling of fissure system.
渗流-应力耦合包括多孔介质的渗流-应力耦合和裂隙系统的渗流-应力耦合两方面的内容。
4)  joint system
裂隙系统
1.
Based on the analysis of nonlinear dynamics to time series of strain and stress which are tested by MTS to lots of joint systems of sandstone specimens,a new rule to find the largest Lyapunov exponent is established by introducing LE1-m mathematical model and unit-step function.
基于对大量砂岩试样裂隙系统的MTS全应力–应变时间序列的非线性动力学分析,构造单位阶跃函数并引入到最大Lyapunov指数LE1的判别模型中,建立了确定LE1的新准则。
5)  double porosity medium
双重孔隙介质系统
6)  double porosity medium system
双重孔隙储集层系统
补充资料:双重调制遥测系统
      第一次调制为多路复用,第二次调制为射频载波调制的多路遥测系统。双重调制遥测系统可分为时分-频分和频分-频分两类。
  
  时分-频分双重调制遥测系统   常用的有PAM-AM,PAM-FM,PAM-PM,PDM-AM,PDM-FM,PDM-PM,PPM-AM等系统。这里AM为调幅,FM为调频,PM为调相,PAM为脉幅调制,PDM为脉宽调制,PPM为脉位调制。图1为PAM-FM系统的框图(图中上标-1表示相应的解调器)。
  
  时分系统由于采样原因对输入端的信号频谱作了变换,有时会出现拍频现象。所以输入通道要有带通滤波器,使高于调制信号最高频率fm的噪声不致进入采样系统,以消除拍频现象。时分系统在解调过程中有时会出现高频损失现象,称为孔径效应。时分制PDM、PPM系统在解调过程中,要先变换成PAM信号,再用低通滤波器解调,就可获得输入的原始信号,不会发生孔径效应。
  
  频分-频分双重调制遥测系统  常用的有FM-FM,AM-AM,AM-FM,FM-AM,AM-PM,FM-PM等系统。图2为 FM-FM系统的框图(图中上标-1表示相应的解调器)。频分系统在多路副载波相加之后,信号进入公共通道,再经射频调制,功率放大,把信号传播出去。当合成信号振幅超过线性区间时将产生严重的串音,出现多路系统的超调现象。因此要按照一定的超调概率选择线性动态范围和每路副载波的功率分配,把超调现象引起的严重串音控制在一定的水平之内。
  
  参考书目
   范希林著:《遥测学》,科学出版社,北京,1983。
  

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