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徐烽淋,唐  巍,刘 璞,等. 页岩失水过程中声电特性的试验研究[J]. 科学技术与工程, 2020, 20(24): 9788-9795.
XU Feng-ling,et al.Experimental Study on Acoustic and Electrical Properties of Shale During Water Loss[J].Science Technology and Engineering,2020,20(24):9788-9795.
页岩失水过程中声电特性的试验研究
Experimental Study on Acoustic and Electrical Properties of Shale During Water Loss
投稿时间:2019-02-13  修订日期:2020-06-02
DOI:
中文关键词:  页岩失水过程 含气饱和度 波速 波速比 电阻率 介电常数
英文关键词:shale water loss process  gas saturation  wave velocity  wave velocity ratio  the resistivity  dielectric constant
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
              
作者单位
徐烽淋 重庆市涪陵页岩气环保研发与技术服务中心
油气藏地质及开发工程国家重点实验室
唐  巍 四川宏大安全技术服务有限公司
刘 璞 重庆市涪陵页岩气环保研发与技术服务中心
油气藏地质及开发工程国家重点实验室
陈 乔 中国科学院重庆绿色智能技术研究院
朱洪林 中国科学院重庆绿色智能技术研究院
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中文摘要:
      实验室利用岩心气驱水试验来探究页岩失水过程中的超声波速度、电阻率变化规律及其相互关系。结果表明:(1)随着含气饱和度的增加,页岩纵波速度线性减小,下降幅度为9.1%,而横波速度线性增加,增加幅度为16.2%,横波速度对含气饱和度变化更加敏感。(2)将完全饱和的岩石模拟为水层时,波速比随含气饱和度的增加而线性减小,在大于50%含气饱和度时,减小幅度增大,说明储层逐渐由含水层向含气层过渡。(3)页岩的电阻率随着含气饱和度的增加呈指数函数递增,而岩石介电常数则随着含气饱和度的增加而呈指数函数减小。(4)当 <50%时,电阻率随含气饱和度增加了4.3倍,而当 >50%时,电阻率增加了10倍;介电常数变化规律则相反,当 >60%时,介电常数几乎不变,由此可判断当电阻率增加幅度增大,介电常数几乎不变时,则可认为储层已由含水层逐渐向含气层过渡。(5)随着岩心电阻率的增加,纵波波速呈对数函数增加,而横波波速以对数函数递减。利用页岩失水过程中波速、电阻率的变化规律及其相互关系,对实际工程中进行含气储层的识别与评价具有重要意义,但在实际应用时还需结合其他相关参数才能更准确地评价储层。
英文摘要:
      The laboratory USES the core gas flooding test to explore the variation law and correlation of ultrasonic velocity and resistivity in the process of shale water loss. The results show that: (1) with the increase of gas saturation, the compressional wave velocity decreases linearly with a decreasing amplitude of 9.1%, while the shear wave velocity increases linearly with an increasing amplitude of 16.2%. The shear wave velocity is more sensitive to the change of gas saturation. (2) when a fully saturated rock is simulated as a water layer, the wave velocity ratio decreases linearly with the increase of gas saturation. When the gas saturation is greater than 50%, the decrease amplitude increases, indicating that the reservoir gradually transits from an aquifer to a gas bearing layer. (3) the resistivity of shale increases exponentially with the increase of gas saturation, while the dielectric constant of rock decreases exponentially with the increase of gas saturation. (4) when <50%, the resistivity increases by 4.3 times with gas saturation, when > is 50%, the resistivity increases by 10 times. On the contrary, when > is 60%, the dielectric constant is almost constant. Therefore, when the increase of resistivity increases and the dielectric constant is almost constant, the reservoir has gradually transited from aquifer to gas bearing layer. (5) with the increase of core resistivity, the p-wave velocity increases as a logarithmic function, while the s-wave velocity decreases as a logarithmic function. It is of great significance to identify and evaluate gas-bearing reservoirs in practical engineering by utilizing the variation rules and their mutual relations of wave velocity and resistivity in the process of shale water loss, but in practical application, other related parameters should be combined to evaluate reservoirs more accurately.
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