天然裂缝对页岩储层网状诱导缝的控制作用

发布时间：2018-01-14 15:40

本文关键词：天然裂缝对页岩储层网状诱导缝的控制作用　出处：《成都理工大学学报(自然科学版)》2016年06期 　论文类型：期刊论文

【摘要】：页岩地层只有借助体积改造技术形成网状裂缝系统才能实现有效开发,而网状裂缝形成的必要条件是诱导缝沿天然裂缝转向。借助RFPA2D数值仿真软件,从岩石力学角度出发开展诱导缝转向规律的机理研究。结果表明,天然裂缝的长度、走向等都会影响诱导缝转向的难易程度,裂缝长度越大、与最大主应力夹角越小,发生转向的可能性越大;其次,诱导缝起裂的角度也会影响其转向,起裂方位与最大主应力夹角越大,诱导缝沿天然裂缝转向越容易。文章还分析了复杂裂缝性地层诱导缝延伸规律,直观地再现了诱导缝依次打开天然裂缝并分叉的现象,并证明了只有诱导缝沿天然裂缝转向才可能形成复杂诱导缝体系。
[Abstract]:Shale formation can only be effectively developed by forming a network fracture system with volume modification technology, and the necessary condition for the formation of a mesh fracture is to induce the fracture to turn along the natural fracture. RFPA2D numerical simulation software is used. From the point of view of rock mechanics, the mechanism of induced joint steering is studied. The results show that the length and strike of natural crack will affect the degree of difficulty of induced joint steering, and the longer the crack length is. The smaller the angle with the maximum principal stress, the greater the possibility of turning. Secondly, the angle of induced fracture initiation will also affect its steering. The greater the angle between the initiation direction and the maximum principal stress, the easier the induced fracture turn along the natural fracture. The phenomenon that the induced joint opens the natural crack and forks in turn is reproduced intuitively, and it is proved that only when the induced joint turns along the natural crack, can the complex induced joint system be formed.
【作者单位】：油气藏地质及开发工程国家重点实验室(西南石油大学);
【分类号】：TE122.23;;P584
【正文快照】： 中国天然气的需求量越来越大,当前常规气藏开采难度越来越高,页岩气是一种非常理想的能源补给方式。国际上针对页岩气给予了高度重视,继美国成功开发页岩气以来,中国、德国等国家相继加入了页岩气勘探开发行列。然而,中国经过近几年的不断努力,页岩气开发方面却不尽人意,一方

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