基于磁声电耦合的过金属套管电阻率成像测井新方法研究

Energy shortage is serious today . It is quite important for the exploration and development of fossil fuels to study new remaining oil evaluation and complex reservoirs detection technique. In order to solve the actual difficulty in through metallic casing formation resistivity probing,the project proposed a entirely new logging method based on new principle - through metallic casing resistivity imaging logging based on magneto-acousto-electrical coupling（TCRI-MAEC）..The new method involves the advanced interdisciplinary of electrical engineering , acoustics, and resource exploration .The project needs to study the coupling and interactions of magnetic field, sound field and electric field in formation with metallic casing, as well as the analysis of corresponding forward and inverse problems . Specifically, the project includes the following works: studying the excitation and detection theory for well circumference MAEC-based resistivity imaging logging with metallic casing; inspecting influences of different ultrasonic exciting parameters and formation resistivity distribution on receiving signals of TCRI-MAEC logging by numerical simulation and model well experiments; identifying the optimal pulse excitation parameters and other favorable conditions for high quality MAEC-based real formation resistivity imaging through metallic casing; developing a compatible resistivity distribution reconstruction arithmatic. On the basis of works above-mentioned, form a new type of through metallic casing formation resistivity imaging method of high-resolution with independent intellectual property rights, so that we can provide a strong theoretical basis and analysis platform for the developing of downhole tools and the determination of key parameters of downhole tool.

当今世界能源短缺，研究能够很好地实现剩余油评价和复杂油气藏探测的测井技术，对于油气勘探和开发至关重要。本项目针对由于金属套管存在难以测定地层电阻率的实际问题，提出一种新原理的测井方法――"基于磁声电耦合的过金属套管电阻率成像测井"(TCRI-MAEC) 。.新方法涉及电气工程科学、声学和资源探测的前沿交叉，需要研究含金属套管地层中磁场、声场和电场的相互作用，包括相应的正逆问题分析。具体而言，包括研究含金属套管地层基于磁声电耦合的测井激励检测原理；通过数值模拟与物理模型井实验考察不同超声激励参数、地层电阻率分布等对TCRI-MAEC所采集信号的影响规律，找出可实现高质量磁声电成像的最佳脉冲激励参数和其它有利条件；开发与之相适应的电阻率图像重建方法。形成具有自主知识产权的新型高分辨率过金属套管电阻率成像测井方法，为井下仪器的研制和关键参数的确定提供有力的理论支持。

当今世界能源短缺，剩余油评价和复杂油气藏探测技术对于油气勘探和开发至关重要。本项目针对由于金属套管存在难以测定地层电阻率的实际问题，提出了一种新原理的测井方法――“基于磁声电耦合的过金属套管电阻率成像测井”(TCRI-MAEC) 。新方法涉及电气工程科学、声学和资源探测的前沿交叉，研究含金属套管地层中磁场、声场和电场的相互作用，包括相应的正逆问题分析。本项目开展了金属套管地层基于磁声电耦合的测井激励检测原理。通过数值模拟与物理模型井实验考察了不同超声激励参数、地层电阻率分布等对TCRI-MAEC采集信号的影响规律，找出了可实现高质量磁声电成像的最佳脉冲激励参数。研究了套管的非匀质性、水泥环、地层参数等对测量结果的影响规律。开发了电阻率图像重建方法，形成了具有自主知识产权的新型高分辨率过金属套管电阻率成像测井方法，可为井下仪器的研制和关键参数的确定提供有力的理论支持。