岩石宽带电特性的虚拟化测量方法

发布时间：2018-06-19 05:39

本文选题：岩石 + 宽带　；参考：《长安大学》2016年硕士论文

【摘要】：储层岩石电特性是判断油水层及地下油气储集分布等的重要因素,岩石电特性参数的准确测量对电法测井具有重要意义。本文提出了一种基于平行板电容法原理的岩石宽带电特性虚拟化测量方法,并对该虚拟化测量方法的有效性及准确性进行了验证分析。本文在充分研究平行板电容测量夹具结构、原理的基础上,利用HFSS高频电磁仿真软件建立测量夹具的精确数值模型,在100KHz-1GHz频率范围内,对几种混合材料样本进行虚拟化测量,所得介电常数与理论参考值及实验测量结果吻合度较好,验证了虚拟化测量的可行性。针对700MHz以上高频段测量值出现不稳定及偏离理论参考值的问题,通过对该测量系统的结构及电场分布深入分析,对电容器数值模型的阻抗过渡结构进行了设计优化,并制作实现了一套优化高频测量特性的实验测量夹具。优化后的测量系统得到待测件介电常数值在100KHz-1GHz频段内更加稳定精确,实现了岩石等混合材料电特性的宽带测量。利用优化后的虚拟测量系统,在100KHz-1GHz频率范围内,对几种具有不同晶体结构的经典岩石混合材料结构数值模型进行了虚拟化测量及分析,其测量结果与理论结果吻合度很高,进一步验证了虚拟化测量方法的有效性及准确性。这一工作可为任意微观结构的混合材料电特性测量分析及数字岩芯研究工作提供有效依据。
[Abstract]:The electric characteristic of reservoir rock is an important factor to judge the distribution of oil and water reservoir and underground oil and gas reservoir, and the accurate measurement of rock electrical characteristic parameters is of great significance to electric logging. In this paper, a virtualization method of rock broadband electrical characteristics based on parallel plate capacitance method is proposed, and its validity and accuracy are verified and analyzed. In this paper, the structure of parallel plate capacitance measuring fixture is fully studied. On the basis of the principle, the accurate numerical model of measuring fixture is established by using HFSS high frequency electromagnetic simulation software. In the frequency range of 100KHz-1GHz, several kinds of mixed material samples are virtualized measured. The dielectric constant is in good agreement with the theoretical reference value and the experimental results, which verifies the feasibility of virtualization measurement. In order to solve the problem of instability and deviation from the theoretical reference values in the high frequency band above 700MHz, the impedance transition structure of the capacitor numerical model is designed and optimized by analyzing the structure and electric field distribution of the measuring system. A set of experimental fixture for optimizing the characteristics of high frequency measurement is made. The optimized measurement system has obtained a more stable and accurate dielectric constant value in 100KHz-1GHz band, and has realized the wideband measurement of the electrical properties of rock and other mixed materials. Using the optimized virtual measurement system, several classical rock mixed material numerical models with different crystal structures are measured and analyzed in the frequency range of 100KHz-1GHz. The measured results are in good agreement with the theoretical results. The validity and accuracy of the virtualization measurement method are further verified. This work can provide an effective basis for the measurement and analysis of the electrical characteristics of mixed materials with arbitrary microstructure and for the study of digital cores.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P631.811

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