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水对砂岩纵横波速及弹性参数影响的实验研究
Experimental investigation of the influence of water on P- and S-wave velocities and elastic parameters of sandstones
投稿时间: 2017-03-27  最后修改时间: 2017-06-20
DOI:
中文关键词:  黏土  人造泥质砂岩  孔隙度  纵、横波速  弹性参数
英文关键词:clay  artificial shaly sandstones  porosity  P- & S-wave velocities  elastic parameters
基金项目:高等学校博士学科点专项科研基金;国家重点研发计划项目
作者单位E-mail
钟江城 中国矿业大学(北京) zhongjc1988@126.com 
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中文摘要:
      水对含不同黏土矿物油气储层的纵、横波速以及弹性参数有很大影响。为研究此影响,在相同条件下制作了三组(黏土成分分别为蒙脱石、伊利石和伊利石/蒙脱石混合)不同黏土含量(体积分数)的人造泥质砂岩岩样,并先后在常态、饱和及干燥三种状态下进行了纵、横波速测量,在人工岩样黏土填隙分布模型下计算了孔隙度。首先,通过结合临界孔隙度模型的Gassmann模型验证了人工岩样实验数据的合理性;然后,确定了影响岩样波速及弹性参数的主要因素并在其控制下,对比分析了常态、干燥态岩样的纵、横波速及剪切模量和体积模量。结果表明:对于含伊利石岩样,水对纵、横波速及弹性参数影响较小,且孔隙度越大影响越小;对于含伊蒙混合岩样,水的影响较大,浸泡水后岩样纵、横波速及弹性参数均明显变小,说明蒙脱石吸水膨胀后其内部微观孔隙不能被忽略。
英文摘要:
      Water has great impact on P- and S-wave velocities and elastic parameters of oil and gas reservoir containing clay minerals. To investigate it, three groups of artificial shaly sandstones samples (clay composition are montmorillonite, illite and illite-montmorillonite mixed, respectively) with different clay content (volume fraction) were made in the same condition, and P- and S-wave velocities of these samples were measured in normal, saturation, and dry conditions, and the porosity was calculated under the model of interstitial distribution of clay. Firstly, the rationality of the experimental data was proved by combining the critical porosity model and Gassmann theory under saturation condition. Then, we analyzed the main influencing factors of elastic wave velocities and elastic parameters. Finally, contrast to normal and dry condition, a sensitivity analysis of water for P- and S-wave velocities, shear modulus and bulk modulus was done by controlling the main influencing factors. The results show that the influence of water on P- and S-wave velocities and elastic parameters of rock samples containing illite is small, and it decreases with increasing porosity. However, the apparent decreases of P- and S-wave velocities and elastic parameters after swelled suggests that the influence of water is greater for the rock samples containing illite-montmorillonite mixed, and the internal microscopic pore of clay can’t be ignored after the montmorillonite swelled.
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