瞬变电磁测井超深前视探测模拟及参数反演
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中图分类号：P631 文献标识码：A DOI：10.13810/j.cnki.issn.1000-7210.20250084
Abstract： The key of active geosteering is to obtain the pre-drilling formation information in realtime. Based on thefield diffusion theory，transient electromagnetic （TEM） detection hasadvantages suchas high detection efficiency，strong deep detection ability，and small influence from the spacing，and can efectively solve the limitations of frequency-domain ultra-deep look-ahead electromagnetic logging while-drilling. Thus，the TEM detection method is applied to downhole ultra-deep look-ahead detection. The generalized reflection-transmission theory and Talbot frequency-time conversion algorithm are adopted to eficiently simulate the TEM look-ahead logging responses. Meanwhile，the quantitative calculation of key pre-driling logging parameters is completed via combining the Levenberg-Marquardt （L-M） inversion and al-time apparent resistivity algorithm.The results demonstrate that TEM logging can detect multi-boundary formation information of tens of meters ahead of the drill bit by utilizing shortspacing under arbitrary welldeviation.The pre-driling boundary response characteristics are primarily related to the formation resistivity，which influences eddy currnt diffusion ahead of boundaries and the distance to boundary （DTB）.The higher formation resistivity and shorter DTB mean earlier boundary response time. Although the apparent resistivity of logging can qualitatively determine pre-driling formation resistivity distribution，the real-timeand accurate acquisition of boundary distance and formation resistivity stil necessitates refined logging inversion.The research on forward modeling and inversion ofTEM logging forultradeep look-ahead detection validates the efectivenessof the technology in acquiring pre-drilling geological information，thereby providing theoretical guidance for optimizing logging tool design and realizing the applications of active geosteering.
Keywords： transient electromagnetic logging，short spacing，ultra-deep look-ahead，parameter inversion，active geosteering
王晓壮，高杰，柯式镇，等.瞬变电磁测井超深前视探测模拟及参数反演[J].石油地球物理勘探，2026，61（2）： 501-513.
Wang Xiaozhuang，Gao Jie，Ke Shizhen，et al. Simulation and parameter inversion of ultra-deep look-ahead detection for transient electromagnetic logging[J]. Oil Geophysical Prospecting，2026，61（2）：501-513.
0 引言
随着深层、深水及非常规油气勘探开发的不断深人，对利用测井技术获取更深地层信息以实现主动地质导向功能提出了更高要求，电磁波测井在随钻远探及前视中发挥了重要作用[1-2]。（剩余17361字）