2MHz居中型多层介质电磁波响应计算及应用

发布时间：2018-03-22 02:01

本文选题：电磁波测井　切入点：模式匹配法　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文对电磁波测井响应进行了快速精确的模拟。从麦克斯韦方程的电动势求解入手,利用模式匹配法进行了快速正演计算,然后,通过计算多种模型,包括成系列的源距,层厚及围岩,多种频率的纵向分辨率等条件下的地质模型,得到了一系列有关2MHz电磁波测井响应计算的成果图版,考查了2MHz电磁波测井的多种探测特性。最后,将所作的算法和软件与实际的测井资料进行对比验证,检验效果良好。说明本文所作的研究,是正确的,并且研究方法从理论到最后对实际生产应用方面均有创新,方法具有普适性,具有广泛应用的价值。得到的主要研究结论:首先,使用了一种相对于有限元法和有限差分更加快速高效的方法,半解析、半有限元的方法(模式匹配法)来解决复杂的地层条件下的井眼电磁场分布问题。得到了复杂地层中的电磁波测井响应计算公式。其次,将得到的响应计算公式在计算机上用Fortran语言编程实现。针对不同的考察目的设计的地层模型,进行模拟计算,得到了系统的2MHz电磁波测井响应计算图版。这一系列的图版说明了在2MHz频率条件下,电磁波测井的探测特性,包括探测范围,探测深度以及对地层参数条件的敏感性等。最后,将算法和软件应用到实际的测井数据资料中,进一步对之前得到的响应计算结果进行验证。验证结果表明,本文实现的算法和软件,可以较好的判别水淹层和对薄层进行识别。说明了本文使用的模式匹配法这种较新颖的方法是成功的,可以在实际生产中进行推广。
[Abstract]:In this paper, the response of electromagnetic wave logging is simulated quickly and accurately. Starting from the solution of Maxwell equation by electromotive force, the fast forward calculation is carried out by using the pattern matching method. Then, by calculating various models, including the source distance of series, The geological models under the conditions of layer thickness and surrounding rock, longitudinal resolution of various frequencies, and so on, are obtained. A series of results of 2MHz electromagnetic wave logging response calculation are obtained, and various detection characteristics of 2MHz electromagnetic wave logging are examined. By comparing the algorithm and software with the actual logging data, the results are good. The results show that the research done in this paper is correct, and the research method has been innovated in the practical production application from the theory to the end. The main conclusions are as follows: firstly, a more rapid and efficient method than finite element method and finite difference method is used. The semi-finite element method (pattern matching method) is used to solve the problem of hole electromagnetic field distribution under complex formation conditions. The formula for calculating the response of electromagnetic wave logging in complex formation is obtained. The response calculation formula is programmed in Fortran language on the computer. The formation model designed for different inspection purposes is simulated and calculated. This series of charts show the detection characteristics of electromagnetic wave logging under 2MHz frequency, including detection range, depth and sensitivity to formation parameters. The algorithm and software are applied to the actual well logging data, and the response calculation results obtained before are further verified. The verification results show that the algorithm and software are implemented in this paper. The pattern matching method used in this paper is successful and can be popularized in actual production.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.811

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