张继锋, 黄朝峰, 周建美. 海洋可控源电磁法几类偶极源探测海底高阻薄层的分辨率分析[J]. 煤田地质与勘探, 2018, 46(3): 139-144. DOI: 10.3969/j.issn.1001-1986.2018.03.023
引用本文: 张继锋, 黄朝峰, 周建美. 海洋可控源电磁法几类偶极源探测海底高阻薄层的分辨率分析[J]. 煤田地质与勘探, 2018, 46(3): 139-144. DOI: 10.3969/j.issn.1001-1986.2018.03.023
ZHANG Jifeng, HUANG Chaofeng, ZHOU Jianmei. Resolution analysis of several types of dipole source detecting seabed thin layer of high resistivity in marine controllable source electromagnetic method[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(3): 139-144. DOI: 10.3969/j.issn.1001-1986.2018.03.023
Citation: ZHANG Jifeng, HUANG Chaofeng, ZHOU Jianmei. Resolution analysis of several types of dipole source detecting seabed thin layer of high resistivity in marine controllable source electromagnetic method[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(3): 139-144. DOI: 10.3969/j.issn.1001-1986.2018.03.023

海洋可控源电磁法几类偶极源探测海底高阻薄层的分辨率分析

Resolution analysis of several types of dipole source detecting seabed thin layer of high resistivity in marine controllable source electromagnetic method

  • 摘要: 针对海洋可控源中几类典型偶极源发射装置,建立各向异性地层高阻油气藏模型,采用基于格林函数的海洋一维地层解析方法,借助电磁场的互易性质,计算得到不同偶极源激发的电磁响应曲线。分析了不同偶极源的电磁响应特征,比较了各电磁场分量振幅和相位归一化曲线幅值。结果表明:垂直电偶极子源的各场的振幅归一化曲线对异常的反应最大,水平电偶极源对高阻层的分辨率高于垂直磁偶极源,水平电偶极源的轴向观测模式和水平磁偶极子源的赤道观测模式均有较好的分辨率,这两种模式下测量的与测线平行的电场和与测线垂直的磁场的分辨率最佳,且存在着最佳收发距,相位也有着近似相同的变化规律。

     

    Abstract: Aiming at several typical dipole source emission devices in marine controlled-source method, a high resistivity reservoir model of anisotropic formation is established, and a one-dimensional stratigraphic analysis method based on Green function is adopted. With the reciprocal nature of the electromagnetic field, the electromagnetic response generated by different dipole sources are calculated. The electromagnetic response characteristics of different dipole sources are analyzed, and the amplitude and phase normalization curves of each electromagnetic field are compared. The results show that the amplitude normalization curve of the vertical electric dipole source has the greatest response to the anomaly, and the resolution of the high resistive layer is higher than that of the vertical magnetic dipole source. The axial observation mode of the horizontal galvanic source and the equatorial observation mode of the horizontal magnetic dipole source have good resolution. In this two modes, the measured electric field parallel to the survey line and the magnetic field perpendicular to the survey line have the best resolution, and there is an optimal transmitter-receiver distance, and the phase also has the same variation.

     

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