低阻环带性质对双侧向测井响应的影响

摘要

根据有限元法及相关电磁场理论，通过数值模拟研究了低阻环带电阻率大小、低阻环带宽度、低阻环带与井眼之间的距离大小对双侧向测井响应的影响。低阻环带电阻率与侵入带电阻率对比度越大，对双侧向响应影响越大；层界面1／3处的深侧向测井值受低阻环带宽度影响较大；层界面2／3处深侧向测井响应值受低阻环带与井眼之间的距离大小影响会出现曲线幅度差极性变化。为双侧向测井更好地应用于油水层识别中消除低阻环带的影响提供理论依据。%According to the finite element method and the relevant electromagnetic field theory,we are using numerical simulation to study the effects of the resistivity of the low-resistance zone,including the width of the low-resistance zone,the distance between the low-resistance zone and the wellbore on response of dual laterolog.The larger the contrast ratio of the resistivity of the low-resistance zone and the resistivity of the intrusion zone is,the greater the influence on the dual laterolog response will be.Deeper lateral log values at 1 /3 of layer are greatly affected by the low-resistance band width.The response value of deep lateral logging at1 /3 of layer is affected by the distance between the low resistance zone and the wellbore.Curve amplitude difference polarity change.The paper provides a theoretical basis for the application of double lateral logging in the identification of oil and water layers and eliminate of the influence of low-resistance zones.