水平井感应测井影响因素分析及在水淹层解释中的应用

Horizontal Induction Logging Influence Factors Analysis and Its Application in Water-flooded Interpretation

在油基泥浆水平井钻井条件下,由于感应测井探测深度较深,通常会受到泥浆侵入、仪器偏心、围岩和储层厚度等因素影响。利用三维有限元法开发了感应测井数值模拟软件(ILFEM3D),较好地解决了网格部分和赝解问题。分析水平井条件下影响感应测井测井的主要因素为围岩和储层厚度,建立了水平井条件下的感应测井测层厚和围岩校正图版。根据1口密闭取心水平井资料,建立了水淹层感应测井解释图版,并对2口井进行了处理解释应用。和实际投产后的生产情况对比,取得良好的地质解释效果,说明校正后的水淹层感应测井解释图版是有效、可行的。

Under the condition of oil-based drilling mud in the horizontal wells, because the induction logging detects deeply, it is usually affected by the mud invasion, apparatus eccentric, shoulder-bed, reservoir thickness and so on. Developed is the induction logging＇s numerical simulation software（ILFEM3D） by three-dimensional finite element method. Analyzed are influence factors on the induction logging and given their correction chart in the horizontal wells, which are the shoulder-bed and reservoir thickness. Based on the logging data of a sealed coring horizontal well, established is an interpretation chart for water-flooded zone in the horizontal well and processed are two horizontal wells loggings by the chart. Comparing with practical production, geologic interpretation effect is good. It reveals that the revised chart is effective and feasible.