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基于6FF40测量信息反演方法的研究
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针对深感应测井仪6FF40的测量信息，在非均匀背景介质中采用一种迭代方法对地层电导率分布进行反演和剖面成像。该方法是基于场点在目标区内、外的电场积分方程，建立适合于6FF40的反演积分方程。在每次反演迭代过程中，用数值模式匹配法(NMM)求解6FF40的测量信息。利用沿井轴的6FF40不完备的低信息量对地层剖面进行反演，数值模拟结果表明该迭代方法在实际工程应用中的潜力。另外，还讨论了6FF40的纵向、径向分辨率和先验知识的利用等问题。
关 键 词 电磁逆散射; 非线性反演方法; 深感应测井仪; 分辨率; 先验知识
Abstract Reconstruction of formation conductivity distribution for 6FF40 measurement information using an inverse method was described in this paper. Based on the internal and external electrical field integral equation, the inversion equation is derived. Then, the Numerical Mode- Matching is used to solve the logging response of the 6FF40. Numerical simulations show that satisfactory inversion result of the complicated formation can be obtain from the incomplete measurement of the 6ff40. In addition, prior information, the radial and vertical resolution of the 6FF40 is also investigated.
Key words electromagnetic inverse scattering; nonlinear inverse method; 6FF40; resolution; prior information
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