基于谐振接收原理的长源距随钻电磁波电阻率测井方法研究

As the oil and gas distribution becomes more and more complex, it is significant to study on the logging method with far investigation depth. Electromagnetic resistivity logging method mainly studies the resistivity of the formation around the borehole through the measurement and analysis of the magnetic field to realize formation evaluation. Because the voltage of the receiving coil decreases rapidly with the increase of the spacing, it is difficult to improve the investigation depth by increasing the spacing with the traditional method. However, a long spacing electromagnetic resistivity logging method based on electromagnetic resonant coupling which is hopeful to solve the bottleneck problem aforementioned is proposed in this study. Three-dimensional high frequency electromagnetic model and simulation method are put forward considering the multi-scale and complexity of the coil system and the formation to study on the time-space characteristics of the electromagnetic field in the formation under the condition of resonant coupling. The relationship between the response of resonant receiving coil and the formation parameter will be studied. The variation of investigation depth with the parameters of driving source, coil system and formation will be analyzed and the design method of far investigation depth coil system will be established. It is expected to form a new long spacing far investigation electromagnetic resistivity logging method holding independent intellectual property.

随着油气藏分布越来越复杂，随钻深探测测井方法研究具有重大意义。电磁波电阻率测井是通过电磁场测量与分析研究沿井眼周围地层剖面的电阻率参数特征进行地层评价的方法。本项目将磁谐振耦合原理引入电磁波电阻率测井，提出基于谐振接收原理的长源距电磁波电阻率测井方法，有望解决接收线圈电压随源距增加急剧衰减，无法增大源距提高探测深度的瓶颈问题。综合考虑地层复杂性和多尺度特点，建立高频电磁模型和模拟方法，研究谐振接收情况下地层中的电磁场时空分布特性，结合实验确定谐振接收线圈的响应与地层参数的关系。研究线圈系的探测深度随激励源参数、线圈系参数、地层参数等的变化规律，建立深探测线圈系的设计方法。形成具有中国自主知识产权的长源距随钻深探测电磁波电阻率测井方法。

随着油气藏分布越来越复杂，随钻深探测测井方法研究具有重大意义。电磁波电阻率测井是通过电磁场测量与分析研究沿井眼周围地层剖面的电阻率参数特征进行地层评价的方法。本项目将磁谐振耦合原理引入电磁波电阻率测井，提出基于谐振接收原理的长源距电磁波电阻率测井方法，有望解决接收线圈电压随源距增加急剧衰减，无法增大源距提高探测深度的瓶颈问题。综合考虑地层复杂性和多尺度特点，建立高频电磁模型和模拟方法，研究谐振接收情况下地层中的电磁场时空分布特性，结合实验确定谐振接收线圈的响应与地层参数的关系。研究线圈系的探测深度随激励源参数、线圈系参数、地层参数等的变化规律，建立深探测线圈系的设计方法。形成具有中国自主知识产权的长源距随钻深探测电磁波电阻率测井方法。