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首页> 外文期刊>Journal of geophysics and engineering >A 2.5D cross-hole electromagnetic modelling and inversion method and its application to survey data from the Gudao oil field, east China
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A 2.5D cross-hole electromagnetic modelling and inversion method and its application to survey data from the Gudao oil field, east China

机译：2.5D跨孔电磁建模反演方法及其在中国东部孤岛油田勘测数据中的应用

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摘要

Cross-hole electromagnetic (EM) inversion has been increasingly used to study the variations in rock properties between boreholes, particularly the properties and spatial distribution of the fluids in a subterranean reservoir. In this study, a practical method for simulating and inverting cross-hole EM data to reconstruct a resistivity distribution is presented. The iterative regularized inversion method incorporates a priori information and variable roughness measures, assuming that the medium in the target area is two dimensional and the injected source is a point dipole source. A forward solver for two-and-half-dimensional (2.5D) EM modelling was developed using the finite element method (FEM) for evaluating the forward problem and the 'pseudo-forward' problem needed to construct the sensitivity matrix. The resulting linear system of equations in the forward problem is solved efficiently by the modified incomplete Cholesky biconjugate gradient iterative method. The partial derivatives forming the sensitivity matrix are computed by the adjoint equation based on the reciprocity principle. The regularized inversion scheme, which can be constrained using the available a priori information from well logging, is used to determine the inter-well resistivity distribution from synthetic EM data and the field data acquired in Gudao oil field in east China. The synthetic and field data examples indicate that our scheme is robust and stable in the presence of random noise and therefore can be used for general cross-hole EM interpretation.
机译：跨孔电磁（EM）反演已越来越多地用于研究井眼之间岩石特性的变化，尤其是地下储层中流体的特性和空间分布。在这项研究中，提出了一种模拟和反演跨孔电磁数据以重建电阻率分布的实用方法。迭代正则化反演方法结合了先验信息和可变粗糙度测度，假设目标区域中的介质是二维的，注入源是点偶极子源。使用有限元方法（FEM）开发了用于二维（2.5D）EM建模的正向求解器，用于评估正向问题和构造灵敏度矩阵所需的“伪正向”问题。通过改进的不完全Cholesky双共轭梯度迭代方法可以有效地解决正问题中所得的线性方程组。基于互易原理，通过伴随方程计算形成灵敏度矩阵的偏导数。可以使用测井中可用的先验信息来约束的正则化反演方案，用于根据合成EM数据和华东孤岛油田获得的现场数据确定井间电阻率分布。综合和现场数据示例表明，我们的方案在存在随机噪声的情况下是鲁棒且稳定的，因此可用于一般的跨孔电磁解释。

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  • 来源
    《Journal of geophysics and engineering》 |2008年第4期|p.401-411|共11页
  • 作者

    Jin-Song Shen; Wen-bo Sun; Wen-Jie Zhao; Wen-Chong Zeng;

  • 作者单位

    Geophysical Department, Faculty of Resources and Informatics, China Petroleum University,102249 Beijing, People's Republic of China CNPC Key Lab of Geophysical Exploration, China Petroleum University, 102249 Beijing,People's Republic of China;

    rnGeophysical Department, Faculty of Resources and Informatics, China Petroleum University,102249 Beijing, People's Republic of China;

    rnSINOPEC Shengli Oilfield Well Logging Company, 257001 Dongying, Shandong,People's Republic of China;

    rnSINOPEC Shengli Oilfield Well Logging Company, 257001 Dongying, Shandong,People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    2.5D; cross-hole EM; regularized inversion and application; finite element method;

    机译：2.5D;十字孔EM;正规化的反演和应用;有限元法;

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