| 富含黏土矿物的低渗砂岩变形响应特征研究 |
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| 引用本文： | 肖文联,赵金洲,李闽,王俊,李丽君.富含黏土矿物的低渗砂岩变形响应特征研究[J].岩土力学,2012,33(8):2444-2450. |
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| 作者姓名： | 肖文联 赵金洲 李闽 王俊 李丽君 |
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| 作者单位： | 西南石油大学 油气藏地质及开发工程国家重点实验室，成都 610500 |
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| 基金项目： | 油气藏地质及开发工程国家重点实验室国际合作项目(No.PLN0901) |
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| 摘 要： | 为探讨黏土矿物对砂岩变形的响应特征，开展了富含黏土砂岩的渗透率随应力变化的研究。基于渗透率有效应力系数ESCK的含义，分析发现ESCK是岩石变形的响应特征参数，在前人研究的基础上建立了ESCK与岩石变形之间的关系，初步提出了一套新型的岩石变形特征诊断方法。选取两块富含黏土砂岩在3种不同的围压下分别加/卸载孔隙流体压力，根据稳态法原理实测每种试验条件下的岩芯渗透率，同时根据所提出的平移法计算ESCK，结果表明，ESCK是大于1.0的常数，平移法是计算ESCK的有效方法。此外，根据所提出的岩石变形特征诊断方法分析判断了31块岩石的变形特征，发现黏土矿物含量和类型以及岩石的微观孔隙结构是影响岩石变形特征的主要因素。
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| 关 键 词： | 黏土矿物 变形响应特征 ESCK 平移法 孔隙结构 |
| 收稿时间： | 2011-12-30 |
Deformation response characteristics of low-permeability and rich-clay sandstones |
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| XIAO Wen-lian
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ZHAO Jin-zhou
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LI Min
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WANG Jun
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LI Li-jun.Deformation response characteristics of low-permeability and rich-clay sandstones[J].Rock and Soil Mechanics,2012,33(8):2444-2450. |
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| Authors: | XIAO Wen-lian ZHAO Jin-zhou LI Min WANG Jun LI Li-jun |
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| Institution: | State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China |
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| Abstract: | To probe into the influencing law of clay on the deformation response characteristics of low-permeability sandstones,the study of the influencing law of rich-clay sandstones is carried out.Based on the concept of the effective stress coefficient for permeability(ESCK),it is found ESCK can reflect rock deformation and hence called as deformation response characteristic parameter.Meanwhile,According to the comparative analysis of the previous theoretical study,the relationship between ESCK and rock deformation response is constructed and one method diagnosing rock deformation is proposed.Besides,two samples’ permeability measurements under loading/unloading pore pressure with three different confining pressure cycles are made;data obtained with steady-state method are analyzed with the translation method and the ESCK are calculated accordingly.Results show that the values of ESCK are constant and greater than 1.0,the translation method is valid for calculating ESCK.In conclusion,the deformation characteristics of 31 rocks in present and previous papers are evaluated with diagnosing method;the diagnosing results illustrate that the type and content of clay mineral and rock microscopic pore structure are major factors affecting rock deformation. |
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| Keywords: | clay deformation response characteristics ESCK translation method pore structure |
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