An improved interpolation scheme at receiver positions for 2.5D frequency-domain marine controlled-source electromagnetic forward modelling
An improved interpolation scheme at receiver positions for 2.5D frequency-domain marine controlled-source electromagnetic forward modelling
复制标题
2.5D频域海洋受控源电磁正演模型接收机位置改进插值方案
DOI：
10.1111/1365-2478.12937
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发表时间：
2020
影响因子：
2.6
通讯作者：
Yixin Ye
中科院分区：
文献类型：
--
作者：
Gang Li;Shuangmin Duan;Hongzhu Cai;Bo Han;Yixin Ye
提出了一种改进的2.5维海洋受控源电磁场正演插值方法。对于海洋可控源电磁法，由于海水和海底沉积层之间的电阻率差异，很难精确计算通常位于海底的接收器处的电磁场。在这项研究中，2.5维受控源电磁响应模拟交错有限差分法。二次场方法用于避免源奇异性，一维分层背景模型用于准解析地计算由源激发的一次场。详细讨论了在整个计算域的单元节点处的电磁场到接收器位置的插值。数值试验表明，与线性插值或严格插值相比，改进的插值方法能更准确地模拟海底接收器的电磁响应。
An improved interpolation scheme is presented for 2.5‐dimensional marine controlled‐source electromagnetic forward modelling. For the marine controlled‐source electromagnetic method, due to the resistivity contrast between the seawater and seafloor sedimentary layers, it is difficult to compute the electromagnetic fields accurately at receivers, which are usually located at the seafloor. In this study, the 2.5‐dimensional controlled‐source electromagnetic responses are simulated by the staggered finite‐difference method. The secondary‐field approach is used to avoid the source singularities, and the one‐dimensional layered background model is used for calculating the primary fields excited by the source quasi‐analytically. The interpolation of electromagnetic fields at the cell nodes for the whole computational domain to the receiver locations is discussed in detail. Numerical tests indicate that the improved interpolation developed is more accurate for simulating the electromagnetic responses at receivers located at the seafloor, compared with the linear or rigorous interpolation.