| 钟江城*,赵阳,任伟光,陈超凡,周宏伟.水对砂岩纵横波速及弹性参数影响的实验研究[J].实验力学,2018,33(2):228~238 |
| 水对砂岩纵横波速及弹性参数影响的实验研究 |
| Experimental investigation on the influence of water on P- and S-wave velocities and elastic parameters of argillaceous sandstone |
| 投稿时间：2017-03-27 修订日期：2017-06-20 |
| DOI：10.7520/1001-4888-17-077 |
| 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- and S-wave velocities elastic parameters |
| 基金项目:高等学校博士学科点专项科研基金(博导类)(20130023110017)资助；国家重点研发计划项目(2016YFC0600704)资助 |
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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和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，并在主要因素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 a great impact on the P- and S-wave velocities and elastic parameters of oil and gas reservoir containing different clay minerals. In order to study this effect, three sets of artificial argillaceous sandstone samples (montmorillonite, illite and illite/montmorillonite mixture) with different clay contents (volume fraction) were made under the same conditions. The P- and S-wave velocities were measured successively under normal, saturated and dry conditions respectively, and porosity was calculated under the artificial rock sample filling distribution model. Firstly, the rationality of experimental data of artificial rock samples was verified by Gassmann model combining with the critical porosity model. Then, the main factors affecting wave velocities and elastic parameters of rock samples were determined. Under its control, the P- and S-wave velocities, shear modulus and bulk modulus of normal and dry rock samples were compared and analyzed. Results show that the influence of water on P- and S-wave velocities and elastic parameters is small for rock samples containing illite. The larger the degree of porosity, the smaller the influence is. However, for rock samples containing illite/montmorillonite mixture, the influence of water is great. The P- and S-wave velocities and elastic parameters of rock samples after immersion become smaller obviously, which indicates that the microscopic pores of montmorillonite can not be ignored after water absorption and expansion. |
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