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过套管电阻率测井是通过在金属套管井中测量地层电阻率,从而实现对油藏进行动态监测,指导油田进行调整和开发的较新的一种测井方法。在实际进行测量的过程中,仪器测量得到的地层视电阻率受到多种因素的影响,如套管、水泥环、围岩、测量仪器等。这些影响因素会使测量结果与实际地层电阻率存在偏差,从而影响到测量的准确性。为了尽可能的降低这些因素的影响,就需要对测量的环境影响因素进行校正。本文采用数值模拟方法对过套管电阻率测井环境影响因素之一——水泥环因素进行分析和校正,改进以往用公式推导来推算水泥环对过套管电阻率的影响,通过模拟实际水泥环存在下地层视电阻率的变化情况,进行相应理论计算,得到一系列校正图版,校正后得到的测量结果更具可靠性,并开发一套过套管电阻率测井资料环境校正处理软件,对测井资料进行处理。
Cased-resistivity logging is a relatively new type of logging method that measures formation resistivity in a metal cased hole to enable dynamic monitoring of the reservoir and to guide the field to be adjusted and developed. During the actual measurement, the apparent resistivity of the formation measured by the instrument is affected by many factors, such as casing, cement ring, surrounding rock, measuring instruments and so on. These factors will make the measured results and the actual formation resistivity deviation, thus affecting the accuracy of the measurement. In order to reduce the impact of these factors as much as possible, we need to correct the environmental impact factors of the measurement. In this paper, numerical simulation method is used to analyze and correct one of the influencing factors of over-pipe resistivity logging environment-cement ring, and to improve the effect of cement ring on over-casing resistivity by using the formula deduction in the past. The change of apparent apparent resistivity in the presence of a ring, a corresponding theoretical calculation is carried out, a series of calibration plates are obtained, the corrected measurement result is more reliable, and a set of environmental correction processing software for casing resistivity logging data is developed. Log data processing.