测井电缆阻抗对井中激电发射波形的影响研究  

Study on the Influence of Logging Cable Impedance on Transmit Current Waveform in Borehole Induced Polarization Method

作　　者：毛玉蓉[1,2] 郭庆明 谢兴兵[1,2] 周磊[1,2] 严良俊[1,2] 童小龙[2] 李昊锦 MAO Yurong;GUO Qingming;XIE Xingbing;ZHOU Lei;YAN Liangjun;TONG Xiaolong;LI Haojin(School of Geophysics and Petroleum Resources,Yangtze University,Wuhan,Hubei 430100,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University),Wuhan,Hubei 430100,China;Logging Technology Research Institute,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Well Logging Technology Pilot Test Center,China National Petroleum Corporation,Xi’an,Shaanxi 710077,China)

机构地区：[1]长江大学地球物理与石油资源学院,湖北武汉430100 [2]油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100 [3]中国石油集团测井有限公司测井技术研究院,陕西西安710077 [4]中国石油天然气集团有限公司测井技术试验基地,陕西西安710077

出　　处：《测井技术》2023年第4期432-437,469,共7页Well Logging Technology

基　　金：国家自然科学基金面上项目“基于井地激电电磁法的储层流体识别方法研究”(42274103);国家自然科学基金重点项目“水力压裂时域电磁监测方法研究与综合应用”(42030805)。

摘　　要：在深部资源勘探中,大功率激电方法发挥了重要作用。在探测过程中需要将大功率的激发电流经千米级铠装测井电缆输送至井中,在保证电流波形不发生畸变情况下使得地层充分极化,以达到激发极化法探测目的。因此,研究重量以吨计的千米级铠装测井电缆的阻抗特征对于深部资源勘探至关重要。建立千米级电缆高频模型和低频模型,推导出电缆的分布参数,采用阻抗分析仪和现场测试两种方式对3000m铠装测井电缆展开了测试和分析,结果表明在不同频段,电缆对发射电流的大小和波形、信号相位、电缆的幅频特性和相频特性等均有不同程度的影响。因此,在井中探测系统的前期设计中,要注意结合千米级铠装测井电缆的阻抗特征,考虑阻抗匹配等问题,以实现有效的探测。High-power induced polarization method plays an important role in deep resource exploration.During the detection process,it needs to transmit high-power excitation current through kilometers of armored cable to the well to ensure that the current waveform is not distorted so that the formation is fully polarized to achieve the purpose of detection.Therefore,it is very important to study the impedance characteristics of kilometer-level armored cables weighing tons for deep resource exploration.After establishing the high frequency model and low frequency model of the kilometer-level cable,the distribution parameters of the cable are deduced,and the 3000 meter logging cable is tested and analyzed by impedance analyzer and field test.The results show that the cable has different effects on the magnitude and waveform of the transmitted current,the signal phase,the amplitude-frequency characteristics and phase-frequency characteristics of the cable in different frequency bands.In the case of long line transmission in the well,the impedance characteristics of kilometer-grade armored cable should be paid special attention in the preliminary design of the well detection system,and the impedance matching should be considered to achieve effective detection.

关 键 词：测井电缆阻抗 大功率激发极化法 电流波形 幅频特性 相频特性 

分 类 号：P631.3[天文地球—地质矿产勘探]