西南石油大学学报(自然科学版) ›› 2008, Vol. 29 ›› Issue (4): 15-18.DOI: 10.3863/j.issn.1000-

• 地质勘探 • 上一篇    下一篇

热处理岩石微观实验研究

刘均荣1 吴晓东2   

  1. 1.中国石油大学石油工程学院,山东 东营257061; 2.中国石油大学石油天然气工程学院,北京 昌平102249
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-08-20 发布日期:2008-08-20

MICROSCOPIC EXPERIMENT OF THERMAL TREATED ROCK 

LIU Jun-rong1 WU Xiao-dong2   

  1. 1.School of Petroleum Engineering,China University of Petroleum,Dongying Shandong 257061,China;2.Faculty of Petroleum Engineering,China University of Petroleum,Changping Beijing 102249,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-08-20 Published:2008-08-20

摘要:

在大气压力下,对取自储层的3种岩芯在100~800℃范围内进行加热处理,通过电镜扫描观察和矿物成分分析手段从微观角度研究加热对岩石矿物成分、岩石内部微裂缝网络的影响。结果表明:随着加热温度的升高,岩石矿物成分发生变化,部分晶粒结构遭受破坏;在热应力作用下,由于岩石各向异性的热学特性,在岩石内部出现晶间裂缝、晶内裂缝和穿晶裂缝,并逐渐形成一个发育良好的裂缝连通网络,在宏观上导致岩石渗透率的增加。在实验结果的基础上,对高温作用下的矿物结构变化以及裂缝的发生、发展机理进行了探讨,从微观角度对热处理岩石导致渗透率增加的机理进行了讨论。研究结果对热处理油层以改善井筒附近地层渗流状况具有借鉴意义。

关键词: 岩石, 热处理, 裂缝, 矿物组成, 渗透率

Abstract:

An experimental study of high temperature treatment is carried out on three types of rock samples,which come from reservoir formation,to study the effect of thermal treatment on mineral composition and microfracture network,which were measured by Scanning Electron Microscope (SEM) and mineral compositions analysis under the atmospheric pressure and room temperature.Results indicate that the mineral compositions change with the increasing temperature at 100℃ to 800℃ and part of the crystal structure is destroyed.Some intergranular,intragranular and transgranular fractures are induced in the rock during thermal treatment and forms a good connection of fracture network,which results in the increase of rock permeability.The change of crystal structure and the mechanism of fracture creation and extension are discussed,and the mechanism of permeability increase of thermal treated rock is also analyzed.The result will be used for reference on how to improve the flow condition at the nearwellbore formation by formation heat treatment

Key words: rock, thermal treatment, fracture, mineral composition, permeability

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