过套管电阻率测井仪器刻度及井下测量数值模拟-自然科学版.PDF

2013年摇 第37卷摇 摇 摇 摇 摇 摇 中国石油大学学报(自然科学版)摇 摇 摇 摇 摇 摇 摇 摇 Vol.37摇 No.2 摇 第2期摇 摇 摇 摇 摇 摇 摇 摇 Journal of China University of Petroleum摇 摇 摇 摇 摇 摇 摇 摇 Apr.2013 摇 摇 文章编号:1673鄄5005(2013)02鄄0043鄄07摇 摇 摇 doi:10.3969/ j.issn.1673鄄5005.2013.02.007 过套管电阻率测井仪器刻度及井下测量数值模拟 耿摇 敏,梁华庆,尹洪东,刘得军,高摇 杨 (中国石油大学地球物理与信息工程学院,北京 102249) 摘要:为提高过套管电阻率测井的准确性,对刻度装置建模并数值模拟刻度过程,提出套管电流近似算法,数值模拟 薄、厚两种地层模型的近似电流、地层视电阻率和二阶电位差。 结果表明:仪器刻度数值模拟结果能够确定刻度装 置参数,提供理论刻度曲线,辅助计算电极系系数;井下测量数值模拟所提出的电流近似算法具有较强的地层分层 能力,且低阻薄地层的视电阻率逼近程度明显下降,高阻厚地层的二阶电位差值极小,对测井仪分辨率要求较高。 关键词:电测井;过套管电阻率测井;数值模拟;仪器刻度;井下测量 中图分类号:P631.8摇 摇 摇 文献标志码:A Numerical simulation of resistivity logging through casing on instrument calibration and down鄄hole measurement GENG Min,LIANG Hua鄄qing,YIN Hong鄄dong,LIU De鄄jun,GAO Yang (College of Geophysics and Information Engineering in China University of Petroleum,Beijing 102249,China) Abstract:Inordertoimprovetheaccuracy of resistivity loggingthroughcasing,numerical simulationresearchoninstrument calibration and down鄄hole measurement was constructed. In the aspect of instrument calibration,the calibration device was modeled and the numerical simulation on instrument calibration was executed. In the aspect of down鄄hole measurement,the approximate methodfor current calculationwasproposed,andtheapproximatecurrent,theapparentformationresistivity and the second order potential difference of the thin layer and the thick layer were simulated numerically. The simulation results of instrument calibration help to select the parameter for the calibration device,provide the theoretical calibration curve and assist to calculate the coefficient of the electrode array. The simulation results of down鄄hole measurement show that the ap鄄 proximate methodfor current calculation hasstrongabilitytodistinguishlayerbou