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研制了交流电阻池及直流高阻测定仪 ,并制备了相应的探头来测试极高的砂土电阻率。试验测试采用的砂土及地下水取自塔中 4油田中心地带 ,砾石杂质取自戈壁地区。利用已经知道其电阻值的KCl标准溶液来标定电阻池及电阻探头的系数 ,然后根据测定值及系数来计算未知的砂土体系的电阻值。虽然干砂土等高电阻体系电阻率测定本身误差较大 ,但是 ,采用了交流与直流两种方法进行校正 ,取其平均值 ,其误差是比较小的。研究给出了砂土的含水量、杂质(戈壁砾石 )含量及密实度都影响电阻率 ,其中以含水量的影响最大 (特别是当地的含盐地下水 ) ,杂质 (含盐砾石 )含量次之 ,密实度的影响则相对较小。该研究结论可直接应用于工程设计。
Developed AC resistance cell and DC high resistance tester, and prepared the corresponding probe to test the high sand resistivity. The sand and groundwater used in the test were taken from the center of Tazhong 4 oilfield and gravel impurities were taken from the Gobi area. The KCl standard solution, which already knows its resistance value, is used to calibrate the coefficients of the resistance cell and the resistance probe, and then the resistance value of the unknown sand system is calculated based on the measured value and the coefficient. Although the determination of resistivity of dry sand and other high resistivity system itself is relatively large, the two methods of AC and DC are used to correct the errors. The average error is relatively small. The study shows that the sand content, impurity (Gobi gravel) content and the density affect the resistivity, of which the influence of water content is the greatest (especially in the local saline groundwater) and the content of impurities (salty gravel) is the second , The impact of density is relatively small. The conclusion can be directly applied to engineering design.