Impact of rock anisotropy on fracture development  

作　　者：Lianbo Zeng Jiyong Zhao Shengju Zhu Weiliang Xiong Yonghong He Jianwen Chen 

机构地区：[1]Key State Laboratory of Petroleum Resource and Prospecting in China University of Petroleum, Beijing 102249, China [2]Resources and Information Faculty, China University of Petroleum, Beijing 102249, China [3]Exploration and Development Research Institute, Changqing Oilfield Branch, Xi＇an 710021, China

出　　处：《Progress in Natural Science:Materials International》2008年第11期1403-1408,共6页自然科学进展·国际材料（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant No.40572080);the Petroleum Science Innovation Foundation,CNPC(Grant No.05E7026);the Plan for Supporting New-Century Quality Talent,Ministry of Education,China

摘　　要：Experiments on uniaxial and triaxial rock mechanics and rock acoustic emissions have been conducted for research on the impact of rock anisotropy on the development of the fractures of different directions by taking as an example the ultra-low-permeability sandstone reservoir in the Upper Triassic Yanchang Formation within the Ordos Basin. The experimental results prove the existence of anisotropy of the rock mechanical property in the different directions on the plane, which is the chief reason for the production of impacts on the development of different assemblages of fractures in the geological periods. The rock anisotropy usually restricts the development of one assemblage of conjugate shear fractures. The fractures in the Yanchang Formation within the Ordos Basin are mainly shear fractures that formed under two tectonic actions. Theoretically, here, four assemblages of shear fractures should have developed, but due to the effect of a strong rock anisotropy, in each period one assemblage of fractures chiefly developed. Thus, two assemblages of fractures are usually developed in every part at present.的实验单轴并且 triaxial 岩石力学和岩石声学的排出物被在 Ordos 盆以内在上面的三叠纪的 Yanchang 形成作为一个例子拿 ultra-low-permeability 沙岩水库为关于不同方向的破裂的发展的关于岩石 anisotropy 的影响的研究进行了。试验性的结果在飞机上在不同方向证明岩石的 anisotropy 的存在是机械性质，它是为在在地质的经期的破裂的不同集合的发展的影响的生产的主要原因。岩石 anisotropy 通常限制一个集合的发展结合砍破裂。在 Ordos 盆主要是的在内的 Yanchang 形成的破裂砍在二个构造行动下面形成了的破裂。理论上，这里四个集合砍破裂应该发展了，但是由于强壮的岩石 anisotropy 的效果，在每个时期，破裂的一个集合主要发展了。因此，破裂的二个集合通常目前在每部分被开发。

关 键 词：FRACTURE Rock anisotropy Rock mechanical experiments Acoustic emission experiments 

分 类 号：P584[天文地球—岩石学]