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在介绍阵列侧向电极系工作原理及点源模拟柱状电极快速正演算法的基础上,基于不同模型的正演计算,分析总结其响应特性。随井径和目的层电阻率ρt的增大,最浅探测模式的响应ρa0与泥浆电阻率ρm之间的非线性减弱;不同井径下随侵入半径的变化,低侵模型各模式(由浅探测至深探测)的响应有递增关系,而高侵模型的响应出现乱序;对有围岩有侵入模型,层界面附近的响应有时存在震荡现象。这些特性可用于阵列侧向测井响应的解释和反演研究,同时也为测井工程师分析测井响应提供了理论基础。
Based on the principle of the array lateral electrode system and the rapid forward algorithm of the point-source simulated columnar electrode, the response characteristics are analyzed and summarized based on the forward modeling of different models. With the increase of borehole diameter and the resistivity ρt of the target layer, the nonlinear response between ρa0 and the resistivity ρm of the shallowest detection mode is weakened. With the variation of the invasion radius under different borehole diameters, To-deep exploration), but the response of the high invasion model appears out of order. There is an oscillatory response to the presence of intrusion models of the surrounding rock and the response near the layer interface. These features can be used for interpretation and inversion of array lateral log responses and provide the rationale for logging engineers to analyze log responses.