海洋CSEM信号分析与解释系统的设计与实现

发布时间：2018-05-24 20:29

本文选题：海洋可控源电磁 + 数据处理　；参考：《成都理工大学》2015年硕士论文

【摘要】：海洋可控源电磁(MCSEM)勘探技术是一种通过油气藏及周边沉积物的电阻率存在差异化的原理来判定海底是否有油气储层,被广泛应用于海洋油气储层钻探前的储层价值预测与评估的探测方法。海洋CSEM技术优势明显,数据采集设备集成化高。它不仅补充了海洋勘探的不足,提高钻井勘探的成功率,而且能有效地勘探海底油气及天然气水合物储层。CSEM技术与地震、测井、地质等资料综合解释能有效提高薄层电阻率油气解释精度,区分地下的油气与其他流体,增加勘探的精度和准确性,提高钻探成功率。虽然国外海洋电磁发展迅猛,但国内海洋电磁的发展依然十分缓慢,各项研究任务,包括硬件及高效快速的处理软件仍十分落后,目前国内有关海洋CSEM勘探技术实质性的研究尚处于起步阶段,还没有出现完善的海洋电磁探测数据处理与解释技术。基于此本文以现有的海洋CSEM电磁法基本原理为基础,依托国家科研项目,通过调研大量的海洋可控源电磁的文献资料完成了如下工作,以期为下一步研究提供一些帮助。(1)通过搜集和分析大量海洋MT探测、海洋CSEM探测等相关的技术资料,更加深入理解了海洋可控源电磁法(MCSEM)的基本原理,并在本文中详细介绍了MCSEM的理论基础。(2)介绍了海洋CSEM探测的发射装置并分析了海洋CSEM发射信号的特征,分析了几种常用的海洋CSEM发射波形,尤其对本课题中使用的方波信号进行详细分析。(3)介绍了海洋CSEM探测的接收装置,分析了接收信号,主要通过收发距与接收信号的关系对接收信号进行了研究。(4)参考了大量国内外海洋电磁以及地球物理学科领域中的优秀可视化解释软件,找出适合海洋CSEM的可视化解释方法。本文采用的是振幅随偏移距曲线(MVO)数据解释方法,本文对该方法作了详细介绍,通过实验结果图形的绘制,举例说明了高阻油气层厚度与MV0最大值的关系；(5)在前人研究基础上,本文对海洋CSEM数据处理步骤进行了分析和总结,总结了海洋CSEM数据处理的步骤,原始数据初始化；方位校正,有两种方式可以选择,即椭圆极化分析和旋转电性轴分析；海洋CSEM的噪声信号的消除；最后合并航行位置数据绘制出可视化解释图形；(6)本文利用MATLAB软件和Fortran计算机高级程序语言编写代码,完成了数据处理、一维正演、一维反演、数据解释功能模块的开发工作,并最终将所有模块集成到本文设计的软件解释系统中。(7)详细介绍了本文设计的解释软件的使用说明,包括对系统界面中按钮,复选框,下拉列表等功能介绍说明,还介绍了参数的设置和一些系统默认操作,最后使用本系统软件进行一系列实验测试,并将实验结果与一些可靠的海洋CSEM电磁探测相关文献的结论相比较,验证解释处理结果的正确性。
[Abstract]:Marine controllable source electromagnetic (MCSEMM) exploration technology is a method to determine whether there is an oil and gas reservoir on the bottom of the sea by differentiating the resistivity of oil and gas reservoir and its surrounding sediment. It is widely used in the prediction and evaluation of reservoir value before offshore oil and gas reservoir drilling. Ocean CSEM technology has obvious advantages and high integration of data acquisition equipment. It not only complements the deficiency of ocean exploration and improves the success rate of drilling exploration, but also can effectively explore subsea oil, gas and gas hydrate reservoir. CSEM technology and seismic logging. Comprehensive interpretation of geological and other data can effectively improve the interpretation accuracy of thin layer resistivity oil and gas, distinguish underground oil and gas from other fluids, increase the accuracy and accuracy of exploration, and improve the success rate of drilling. Despite the rapid development of ocean electromagnetic in foreign countries, the development of marine electromagnetic in China is still very slow, and all kinds of research tasks, including hardware and efficient and fast processing software, are still very backward. At present, the substantial research on marine CSEM exploration technology is still in its infancy, and there is no perfect data processing and interpretation technology for marine electromagnetic exploration. Based on the existing basic principles of ocean CSEM electromagnetic method, and relying on the national scientific research project, this paper has completed the following work by investigating a large number of documents of ocean controllable source electromagnetic. In order to provide some help for the next research.) through collecting and analyzing a large amount of ocean MT detection, ocean CSEM detection and other related technical data, we have a deeper understanding of the basic principle of ocean controllable source electromagnetic method (MCSEMM). In this paper, the theoretical basis of MCSEM is introduced in detail. (2) the launcher of marine CSEM detection is introduced, and the characteristics of marine CSEM emission signal are analyzed, and several commonly used ocean CSEM emission waveforms are analyzed. In particular, the square wave signal used in this subject is analyzed in detail. (3) the receiving device for marine CSEM detection is introduced, and the received signal is analyzed. The received signal is studied by the relation between the receiving and transmitting distance and the received signal. (4) referring to a large number of excellent visual interpretation software in the field of ocean electromagnetic and geophysics at home and abroad, the visual interpretation method suitable for marine CSEM is found out. In this paper, the amplitude versus offset curve (MV0) data interpretation method is used. The method is introduced in detail in this paper. The relationship between the thickness of high resistivity reservoir and the maximum value of MV0 is illustrated by the drawing of the experimental results. This paper analyzes and summarizes the processing steps of marine CSEM data, summarizes the steps of ocean CSEM data processing, initializes the original data, adjusts the azimuth, there are two ways to choose, that is, elliptical polarization analysis and rotating electric axis analysis. In this paper, we use MATLAB software and Fortran computer advanced program language to write code, complete data processing, one-dimensional forward modeling, one-dimensional inversion, Finally, all the modules are integrated into the software interpretation system designed in this paper.) the usage instructions of the interpretation software are introduced in detail, including the buttons in the system interface, check boxes, and so on. Function description such as drop-down list, parameter setting and some system default operation are also introduced. Finally, a series of experimental tests are carried out using the software of this system. The experimental results are compared with the conclusions of some reliable marine CSEM electromagnetic exploration literatures to verify the correctness of the interpretation and processing results.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325

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