钻遇断层水平井地层模型的阵列感应测井响应特性数值模拟

建立钻遇断层水平井地质模型,利用COMSOL有限元软件实现HDIL阵列感应测井响应三维数值计算,研究在钻遇断层水平井中断层参数对HDIL阵列感应测井响应的影响特征。结果表明,钻遇断层时,阵列感应不同子阵列的数值和相互关系与水平井的位置、断距、储层和围岩电导率有关;断层倾角影响测井曲线开始变化的位置。长子阵列最先反应断层存在,7个子阵列响应相交情况可以确定断层位置;进入上盘时7个子阵列的数值和相互关系可以识别水平井进入上盘的位置。

Numerical Simulation of Response Characteristics to the Array Induction Logging in the Horizontal Well Penetrating Faults

The study of response characteristics in horizontal well penetrating fault plays an important role in the analysis of the fault status.Firstly, the geologic model of the horizontal well is established, and then use the results of COMSOL three-dimensional numerical calculation to study the response characteristics of the high definition induction logging tool (HDIL) in horizontal well of drilling faults.The results show that when drilling encounters fault formation, the values and correlations of subarrays change with the well position, fault distance, reservoir and shoulder conductivity of the horizontal well.Fault dip affects the changing position of logging curve.The longest subarray responses the existence of faults firstly, and the intersection of all the response characteristics can determine the position of faults.The values and correlations of the seven subarrays at the time of entry in the hanging wall can identify the position of the horizontal well into the hanging wall.