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在大斜度井和水平井中,不同电阻率测井系列测量的结果并非完全一致,测量结果的差异性分析对于正确认识和评价地层非常重要.依据双侧向测井和随钻电磁波测井原理,采用三维有限元素法模拟双侧向在水平井中的测井响应特征,采用积分方程法模拟随钻电磁波电阻率在水平井中的测井响应特征,通过对比分析值模拟结果,造成大斜度井和水平井随钻电阻率与双侧向电阻率测井响应差异的主要因素有:井斜、各向异性、地层界面以及泥浆侵入.随钻电阻率一般受泥浆侵入影响小,但是它在水平井中容易产生极化现象,有助于地层界面识别,同时受各向异性影响明显;而双侧向电阻率在水平地层中对地层界面不敏感,且受各向异性影响相对较弱,但会受泥浆侵入影响严重;正确认识这些差异,可以有效指导水平井的合理解释.
In high deviated wells and horizontal wells, the results of different resistivity logging series are not exactly the same, and the difference analysis of measurement results is very important for correctly understanding and evaluating stratigraphy.Based on the theory of double lateral logging and the electromagnetic wave logging while drilling , The three-dimensional finite element method was used to simulate the logging response characteristics of double-lateral horizontal wells. The integral equation method was used to simulate the logging response characteristics of the electromagnetic wave resistivity in horizontal wells. By comparing the results of simulation results, The main factors that differentiate the logging response from horizontal well logging and double-sided resistivity logging are wellbore inclination, anisotropy, formation interface and mud intrusion. While the resistivity in drilling is generally less affected by mud invasion, The wells are prone to polarization, contributing to the identification of the formation interface, while being significantly affected by the anisotropy. However, the bilateral resistivity is not sensitive to the formation interface in the horizontal formation and is relatively weakly affected by the anisotropy, but Affected by the invasion of mud, the correct understanding of these differences can effectively guide the rational interpretation of horizontal wells.