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一种新共面线圈系对薄层的响应特征分析
引用本文:张妙瑜,郭宝龙,仵杰,吴银川.一种新共面线圈系对薄层的响应特征分析[J].石油地球物理勘探,2018,53(3):578-586.
作者姓名:张妙瑜  郭宝龙  仵杰  吴银川
作者单位:1. 西安电子科技大学智能控制与图像工程研究所, 陕西西安 710071;2. 西安石油大学电子工程学院, 陕西西安 710065
基金项目:本项研究受国家自然科学基金项目(41474108、41704106)和国家级大学生创新创业训练计划项目(201610705024)联合资助。
摘    要:针对常规三分量感应共面线圈系在薄层中的响应变化大、难以有效分辨薄层的问题,本文提出一种“两发射一接收”的子阵列结构,以解析法实现正演模拟,应用层边界的切向连续,引入Bessel函数求解磁赫兹位矢量,得到磁场强度的水平分量,计算两种共面线圈系8个子阵列在层状地层中的响应特性,分析线圈间距、层厚度和薄层电导率对测井响应的影响。结果表明:薄层厚度大于主发射与接收线圈间距时,新共面线圈系能清晰地显示层边界位置,与常规三分量感应共面线圈系相比,测量准确度提高了53.1%;薄层厚度小于主发射与接收线圈间距时,受共面线圈系本身结构以及围岩的影响,在层边界出现波动,波动幅度小于常规共面线圈系。通过分析发射线圈在空间形成的涡流分布,揭示了新共面线圈系减小趋肤效应和降低负响应的机理。研究成果对三分量阵列感应仪器设计和测井响应解释评价具有重要的理论和实际意义。

关 键 词:三分量  阵列感应  共面线圈系  薄互层  
收稿时间:2017-07-30

Response characteristics of a new coplanar coil system in thin beds
Zhang Miaoyu,Guo Baolong,Wu Jie,Wu Yinchuan.Response characteristics of a new coplanar coil system in thin beds[J].Oil Geophysical Prospecting,2018,53(3):578-586.
Authors:Zhang Miaoyu  Guo Baolong  Wu Jie  Wu Yinchuan
Affiliation:1. Institute of Intelligent Control and Image Engineering, Xidian University, Xi'an, Shaanxi 710071, China;2. School of Electronic Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
Abstract:Thin beds cannot be distinguished since the conventional tri-component coplanar coil system causes various responses in them.Therefore we propose a new coplanar coil system based on two-transmitters and one-receiver sub-array configuration.First a modelling is achieved with the analytic method.With tangential continuity in a bed boun-dary and the Bessel function,the horizontal component of magnetic field intensity is obtained.Then we calculate the response of 8 sub-arrays of two coplanar coil systems in bedded formations,and analyze logging response influence caused by coil spacing,bed thickness,and thin-bed conductivity.The following understandings are obtained:a.The boundary position is clearly shown by the new coplanar coil system when the thin bed thickness is greater than the distance between the primary transmitting and receiving coils,and the measurement accuracy is improved by 53.1% compared with the conventional coplanar coil system; b.Fluctuations occur at the bed boundary due to the influence of the coplanar coil system and surrounding rocks when the thin bed thickness is less than the distance between the primary transmitting and receiving coils,but these fluctuations are less than that of the conventional coplanar coil system.Based on the analysis of the eddy-current distribution of the transmitter coil,we have found the mechanism that the skin-effect and negative-response are reduced by the new coplanar coil system.Our research results have an important significance for the tri-component array meter design and logging response evaluation.
Keywords:tri-component  array induction  coplanar coil system  inter-beds  
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