综放开采顶煤裂隙及其对渗透性研究的意义   总被引：2，自引：0，他引：2  

程国明  黄侃  王思敬 《煤田地质与勘探》2002,30(6):19-21

在对综放工作面的煤样进行微观研究基础上,首次运用多重分形理论对顶煤裂隙的不均匀性和各向异性进行了定量表征,并将顶煤裂隙不均匀系数运用于渗透系数研究中,计算结果与实测基本吻合,表明运用多重分形方法,可为研究顶煤节理裂隙及其渗透性研究提供一个新的方法。   相似文献   

Hydraulic pathways in the crystalline rock of the KTB   总被引：1，自引：0，他引：1  

Günter Zimmermann  Alexander Körner  & Hans Burkhardt 《Geophysical Journal International》2000,142(1):4-14

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Permanent water level drop associated with the Spitak Earthquake: observations at Lisi Borehole (Republic of Georgia) and modelling   总被引：1，自引：0，他引：1  

P. Gavrilenko  G. Melikadzé  T. Chélidzé  D. Gibert  G. Kumsiashvili 《Geophysical Journal International》2000,143(1):83-98

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矿区采动断裂的稳定性评价   总被引：1，自引：0，他引：1  

倪宏革  罗国煜 《煤田地质与勘探》1999,27(1):42-44

矿区优势断裂对地表岩移具明显的控制作用。采动断裂的稳定与否,不仅取决于开采区与断裂的距离和开采规模,更重要的在于采动断裂本身系列优势指标的大小,据此认识,用模糊数学方法对其稳定性进行了综合评价,得出了与实际相吻合的结论。   相似文献   

资阳地区震旦系古岩溶储层特征及测井评价   总被引：4，自引：0，他引：4  

包强  肖梅 《矿物岩石》1999,19(3):52-55

位于四川盆地的资阳地区在震旦系灯影组中发现了继威远震旦系气藏之后的又一大型气藏。区内７口钻井揭露的地层显示本区灯影组主要由一套震层状白云岩民,基质岩块具低孔低渗特点,有效的储集空间是由受古岩溶作用产生的溶蚀孔洞和构造作用产徨的裂缝共同构成,溶洞具有数量多,大洞多,发育集中的特点,裂缝具有成因,多期次,多产状的特点,对这套以缝洞型为玉的储层,由常规测井资料计算单一的物性参数（如孔隙度等）的方法难以其  相似文献   

Single phase water flow through rock fractures   总被引：7，自引：0，他引：7  

B. Indraratna  P.G. Ranjith  W. Gale 《Geotechnical and Geological Engineering》1999,17(3-4):211-240

Flow analysis plays a major role in various geotechnical applications, and the understanding of flow mechanisms is essential for the development of a hydro-mechanical flow model suitable for underground excavations in rock. Discrete flow analysis through discontinuities is reviewed including empirical and analytical flow models. The influence of external loading on joint deformation and single-phase flow show that the surface roughness and aperture size are the prime factors influencing flow rate. Nevertheless, the idealization of natural fractures as smooth parallel plate joints is still followed in many numerical models, because of the simplicity of the cubic law when applied to fracture networks. A numerical study of water flow through a network of joints employing Universal Distinct Element Code (UDEC) is used to quantify the effects of joint orientation and external stress acting on idealized joints.It is found that, for the same joint spacing, the flow rate into an excavation depends on the boundary block size (A_b) relative to the excavation size (A_e). The inflow becomes excessive if A_b/A_e is less than 4, but becomes very small if A_b/A_e exceeds 8.  相似文献   

松辽盆地三肇地区油田储层裂缝及地应力特征   总被引：10，自引：2，他引：8  

王秀娟  孙贻铃 《高校地质学报》1999,5(3):328-333

在大量裂缝发育特征的观察和统计工作基础上,结合油田开发动态和古构造发育史分析等,应用岩芯古地磁定向,差应变和波速各和异性等研究方法,结果认为三肇地区扶杨油层发育的裂缝走向以近东西向为主,多具高倾角,并可构成规模较大的主裂缝,其在油田注水开发中起着不可轻视的作用。分析表明,裂缝发育的密度与砂层的厚度成反比,与构造曲率成正比。区域最大水平主应力为北西西向,近东西向裂缝为油田最有效裂缝组系。  相似文献   

鄯善油田裂缝特征及构造应力场   总被引：7，自引：0，他引：7  

岳乐平  张莉  吴诗平  朱永贤 《地质力学学报》1999,5(2):59-64

通过野外节理裂缝的观测,钻井岩心裂缝的古地磁定向与倾角测井裂缝解释,分析了鄯善油田构造应力场,得出鄯善油田储层构造裂缝发育方位主要为N30°-40°E,N30°-50°W,为一对NE、NW向共轭断裂.高角度缝和垂直缝为主.鄯善构造带是近南北挤压作用下形成的,侏罗纪末期燕山期构造运动为近SN向的主压应力模式,形成油田内一系列近SN向正断层,以及测量的NE、NW向共轭断裂.鄯善油田储层断裂是侏罗纪末期燕山期构造运动形成的.通过倾角测井椭圆井径曲线分析等方法判别的鄯善油田现今最大水平主应力方向约140°.人工压裂的裂缝方位理论上当为140°,它与320°方位的构造缝如果匹配,可能对压裂产生影响.  相似文献   

Simulation of the spontaneous growth of a dynamic crack without constraints on the crack tip path   总被引：2，自引：0，他引：2  

Nobuki Kame  & Teruo Yamashita 《Geophysical Journal International》1999,139(2):345-358

The spontaneous growth of a dynamic in-plane shear crack is simulated using a newly developed method of analysis in which no a priori constraint is required for the crack tip path, unlike in other classical studies. We formulate the problem in terms of boundary integral equations; the hypersingularities of the integration kernels are removed by taking the finite parts. Our analysis shows that dynamic crack growth is spontaneously arrested soon after the bending of the crack tips, even in a uniformly stressed medium with homogeneously distributed fracture strengths. This shows that the dynamics of crack growth has a significant effect on forming the non-planar crack shape, and consequently plays an essential role in the arrest of earthquake rupturing.  相似文献   

Attenuation behaviour of tuffaceous sandstone and granite during microfracturing   总被引：1，自引：0，他引：1  

Angelika-M. Wulff  Toshiyuki Hashida  Kimio Watanabe  & Hideaki Takahashi 《Geophysical Journal International》1999,139(2):395-409

Laboratory measurements of ultrasonic wave propagation in tuffaceous sandstone (Kimachi, Japan) and granite (Iidate, Japan) were performed during increasing fracturing of the samples. The fracturing was achieved by unconfined uniaxial compression up to and beyond the point of macrofracture of the specimen using a constant low strain rate. The observed variation of wave velocity (up to 40 per cent) due to the development of micro- and macrofractures in the rock is interpreted by rock models relating velocity changes to damage and crack density. The calculated density of the newly formed cracks reaches higher values for the sandstone than for the granite. Using the estimated crack densities, the attenuation behaviour is interpreted in terms of different attenuation mechanisms; that is, friction and scattering. Rayleigh scattering as described by the model of Hudson (1981 ) may explain the attenuation qualitatively if the largest plausible crack dimensions are assumed in modelling.  相似文献