震电效应的数值模型与实验研究

发布时间：2018-06-18 01:17

本文选题：震电效应 + 震电耦合　；参考：《电子科技大学》2015年硕士论文

【摘要】：在最近些年来,震电效应的实验研究逐渐开展并受到关注,在地球资源勘探及地球科学领域,尤其是油气水的开发的应用潜力巨大,促使国内外学者投入大量精力从事该项研究。此外,震电效应在石油勘探方面对于“剩余油”的寻找,前景十分诱人,相比其它方法,具有可直接探测地下的油气水含量和探测地层裂缝带敏感且方便的特点。本文对目前的震电效应的产生机制和原理进行了概述,并介绍了室内震电效应实验的系统搭建,同时,也介绍了系统内部干扰的消除和系统各部分的设计和选择,并结合了实验数据得到了震电效应的相关结论,最后提出了课题研究仍需面对的挑战和思路。本文对震电效应的基本原理进行了阐述和总结,并重点介绍了双电层现象,涉及到了震电效应的相关因素。从Pride弹性波—电磁波耦合方程组出发,导出无源均匀孔隙介质中的震电耦合波通解表达式,为模拟震电效应测井响应,推导出声源在模拟井中激发声波时井内电磁场和声场的计算表达式以及地层孔隙介质中耦合的声场和电磁场的计算表达式。最后,根据震电耦合方程组的边界条件确定井内井外各个波场的系数,利用波场表达式模拟震电效应的测井曲线响应。本文介绍了理论上震电效应室内实验的设计,包括试验系统各个部分的设计和选择,并做了相关总结和讨论。主要针对本研究过程中试验系统的搭建遇到的相关问题,进行了分析和解决,最终完善了震电效应的室内实验系统设计。通过相关实验测得数据,着重分析了震电效应中声源和接收天线在不同实验条件下的震电信号,并通过对比得出初步的实验结论。在震电效应室内实验的基础上,通过数据分析、实验对比等方法得出震电效应的相关结论。在震电效应实验中,声信号的激励和震电信号的接收是其重要部分。对于声信号的激励,要在保证声信号的强度下,尽可能的减小辐射信号的拖尾,从而更加准确的测得震电信号的起始位置。其中,震电信号的初始位置对震电信号的时延和震电信号的最小可测试距离的计算等有着重要作用。震电信号的接收天线要求是在保证接收性能的基础上,尺寸尽可能的小。
[Abstract]:In recent years, the experimental study of seismoelectric effect has been gradually carried out and paid close attention to. It has great application potential in the field of earth resource exploration and earth science, especially the exploitation of oil, gas and water. To encourage domestic and foreign scholars to devote a great deal of energy to this research. In addition, the exploration of "remaining oil" by seismoelectric effect has a very attractive prospect. Compared with other methods, it can be used to directly detect the oil, gas and water content in the ground and the sensitive and convenient characteristics of detecting the formation fracture zone. In this paper, the mechanism and principle of the current seismoelectric effect are summarized, and the system construction of the indoor seismoelectric effect experiment is introduced. At the same time, the elimination of the system internal interference and the design and selection of the various parts of the system are also introduced. Combined with the experimental data, the conclusions of the seismoelectric effect are obtained, and finally, the challenges and ideas of the subject research are put forward. In this paper, the basic principle of seismoelectric effect is expounded and summarized, and the phenomenon of double layer is introduced emphatically, which involves the related factors of seismoelectric effect. Based on the Pride coupled equations of elastic wave and electromagnetic wave, the general solution expression of seismic coupled wave in passive homogeneous porous media is derived, which is used to simulate the well logging response of seismoelectric effect. The expressions of electromagnetic field and sound field in the well when the sound source excites sound wave in the simulated well and the expression of the coupling sound field and electromagnetic field in the formation pore medium are derived. Finally, according to the boundary conditions of the coupled seismoelectric equations, the coefficients of each wave field in and out of the well are determined, and the log curve response of the seismoelectric effect is simulated by using the wave field expression. This paper introduces the theoretical design of the laboratory experiment of seismoelectric effect, including the design and selection of each part of the test system, and makes the relevant summary and discussion. This paper analyzes and resolves the related problems encountered in the construction of the experimental system, and finally consummates the design of the laboratory experimental system for the shock and electrical effect. Based on the experimental data, the electrical signals of the sound source and the receiving antenna in the seismoelectric effect under different experimental conditions are analyzed, and the preliminary experimental conclusions are obtained by comparison. On the basis of the laboratory experiment of seismoelectric effect, the relevant conclusions of seismoelectric effect are obtained by means of data analysis and experimental comparison. In the experiment of seismoelectric effect, the excitation of acoustic signal and the receiving of seismoelectric signal are important parts of the experiment. For the excitation of the acoustic signal, we should reduce the tail of the radiation signal as much as possible under the guarantee of the intensity of the acoustic signal, so as to measure the starting position of the seismic signal more accurately. Among them, the initial position of the seismic signal plays an important role in the calculation of the delay of the electrical signal and the calculation of the minimum testable distance of the electrical signal. The receiving antenna of seismic signal is required to ensure the receiving performance and the size is as small as possible.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.3;P631.4

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